EverSQL Performance Knowledge Base
EverSQL Database Performance Knowledge Base
Recent 500 database optimization question and answers
- to get different columns from single query
- Oracle restrict rows based on category (Oracle)
- Using * in SELECT queries
- Retrieve and echo random item from database, and continue to echo for five seconds (MySQL)
- CHECK an optimized query plan (SQL Server)
- How to capture rows that match an aggregate
- Using rownum in subquery
- Get column aliases from sql query (PostgreSQL)
- What we can add to make Query Run faster in Oracle ? Below is Oracle Query slowness (Oracle)
- Database design and query optimization/general efficiency when joining 6 tables in mySQL (MySQL)
- Entity Framework Optimize Count Child Entities
- Calculating the right count from two tables (MySQL)
- Performance loss in sql left join when using int
- How can I optimize my varchar(max) column? (SQL Server)
- Why a coverage filtered index do a Lookup
- mysql count with group runs very slow (MySQL)
- Optimize data retrieval from different servers with more than 10M records
- Hyphen in column name cassandra
- Optimize a JOIN query, for multiple correspondances between tables (MySQL)
- Which Select query will run faster
- How can I speed up a slow SUM + ORDER BY + LIMIT query in MySQL? (MySQL)
- Optimizing Query in mysql (MySQL)
- Issues with MySQL SELECT ordering (MySQL)
- How to improve this nested select statment
- MYSQL Refactoring (MySQL)
- Slow query time when using sum() on related table
- right join query return non matching values
- Is there a difference between columnname like %% and no condition at all? (MySQL)
- SQL select unique elements and compare them on two periods
- Nested SQL Server Query Max Date (SQL Server)
- Update Query Efficiency (Oracle)
- Oracle SQL | Efficiently counting Clicks grouped by Week as well as all sub totals (Oracle)
- MySQL How to Select smth by MAX(id)....WHERE userID = some number GROUP BY smth (MySQL)
- mysql dataSource remove quotes from parameter using select with IN clause (MySQL)
- Ad hoc queries against high cardinality columns
- Java Spring MySQL String Timezone column between two milliseconds (MySQL)
- MySQL Weird Date Error (Incorrect datetime value) (MySQL)
- Conditional SQL count (PostgreSQL)
- Slow MySQL query speed (MySQL)
- Finding duplicate entries in a table with 1 billion rows (MySQL)
- JOIN query optimization using indexes
- How do I add an index, reusing some columns?
- How to find records with multiple relations to a second table
- sql select records between datetime start and stop and after stop
- Optimize mysql query in python (MySQL)
- MYSQL inner join with a count sub query (MySQL)
- How can I analyze and optimize my sql query
- Oracle query running too slow (approximately taking 5 hrs) (Oracle)
- Postgres Is \"not exists\" slower than join? (PostgreSQL)
- How to diagnose slow/inconsistent SQL Server query? (SQL Server)
- SQL Server unused LEFT JOIN impacts execution plan (SQL Server)
- oracle pl/sql how to call back this alias created for a parameter? (Oracle)
- Using WHERE clause when totalling entries using COUNT() and JOIN (SQL Server)
- where in (sub query) vs join
- Rewriting \"SELECT DISTINCT ON ...\" using Djangos ORM (PostgreSQL)
- MYSQL query optimization question using Count and 2 tables (MySQL)
- is there a way to limit run of sql command in case of first condition matched?
- Advantage Database Server ignores Index
- Why does TOP or SET ROWCOUNT make my query so slow? (SQL Server)
- How do you get Athena/Presto to recognize parquet index
- Select Query with Conditional Check for group of records
- Sloooow garbage collection query
- SQL select across multiple tables with max dates in each joined table (Oracle)
- BigQuery GROUP BY ... HAVING asks for other columns to be grouped
- Rewriting an SQL Query Without Using Intersect Operator (MySQL)
- Trouble rewriting an SQL query into HQL query
- PostgreSQL, advanced swapping (PostgreSQL)
- Notification system in PHP
- OFFSET effect on query in Vertica
- How do I use DCount with criteria on a Recordset?
- Multiple Select vs Single Select Statement
- Optimize SQL, same line multiple times in CASE (SQL Server)
- Relation does not exist while scanning schema (PostgreSQL)
- Does the order of tables referenced in the ON clause of the JOIN matter?
- Query changes speed (34 vs 0 second), with no data/schema change without execution plan cache (generated SQL from EF Core) (SQL Server)
- How to improve query performance to s3 data from Athena
- Make query more efficient
- SELECT * FROM Employees WHERE NULL IS NULL; SELECT * FROM Employees WHERE NULL = NULL; (Oracle)
- Unidac 5.0 performance degradation (PostgreSQL)
- Query Returning SUM of Quantity or 0 if no Quantity for a Product at a given date
- Fluent NHibernate 1.2 with SubclassMap causes \"No row with the given identifier\" error
- MySQL SAME query with one variabile change take more then 10x longer (MySQL)
- Sqlalchemy: how to filter multiple conditions with filter_rule
- How can I speed up this SELECT query?
- Can I improve the performance of this MySQL query by adding an index? (MySQL)
- I can I make this query run faster (SQL Server)
- Mysql PHP Select with multiple values, MAX(LENGTH()) (MySQL)
- How to write SQL query to calculate instances where a row containing a distinct id occurs 7 days after the fist occurrence if the unique id?
- SQL join using substring in snowflake
- Extremely slow query
- Making complex query even more complex (need to get full term path instead of one level)
- SQL Server memory usage more than 3 GB on 64 bit machine (SQL Server)
- Join two tables using id and descendants from tree like table
- Mysql Select Correlation 2 Levels Deep Subqueries (MySQL)
- What is the best way to store and query a very large number of variable length lists in a MySQL database? (MySQL)
- Filter large number of records on mysql when using INNER JOIN with two fields (MySQL)
- Difference between local MySQL query and production server query execution times (MySQL)
- How to optimize SELECT against a constant value? (MySQL)
- SqlAlchemy core union_all not adding parentheses
- change optimizers plan on using indexes
- Performance: OR conditions in MySQL slow down inner joins significantly? (MySQL)
- slow performance with exists case statement
- Where clause in sql request should be resolved last (SQL Server)
- Is it advantageous using cursor in Oracle for frontend applications? (Oracle)
- Filtering order for SQL joins on large tables with text (MySQL)
- cant find column stats for newly created table
- Need to fix timestamps in my TimescaleDB database (the number of seconds provided to TO_TIMESTAMP was incorrect by exactly a factor of 1000)
- How to refactor this unfound collector sql for mysql so it is faster (MySQL)
- Force number of entries
- SQL Server speed (SQL Server)
- SQL Server Row Count sp_spaceused rows discrepancy (SQL Server)
- How to speed up mysql query using cache (MySQL)
- Using a Materialized View with the Master table empty (Oracle)
- SELECT from table returning one set of value but ignoring secondary condition
- Selecting Aggregate from a Child Table
- Get minimum price from last 30 days and the last price before that, quickly
- T SQL LIKE condition on comma separated list (SQL Server)
- How to optimize: having COUNT(*)>1
- Mysql select with IN, limit rows to 1 for each match (MySQL)
- Query taking very long (Explain included) (MySQL)
- \"Print\" specific columns through foreign keys
- MySQL Simple COUNT taking very long time (MySQL)
- Can I speed up this query by using EXISTS instead of a JOIN?
- Mysql: where ..id != X doesnt include the NULL foreign key (MySQL)
- Calculate difference between 2 epoch times, large table, optimize having 3 indexes
- Rewrite query to prevent only_full_group_by error (MySQL)
- Why is there such a big difference between performance of those two queries? (Oracle)
- Measuring the Performance of SQL Queries
- Select total count of elements group by (MySQL)
- INNER JOIN Optimization
- MySQL join table query returns takes long time if no return result (MySQL)
- Combine multiple select with update
- Optimizing INNER JOIN query performance
- Slow response of DB2 on multiple JOINs in query by JDBC
- Joining results from two tables using having distance
- slow sql script optimization
- MYSQL another optimize sql (MySQL)
- Whats faster, referencing a property in an outer table or comparing against a parameter? (SQL Server)
- Mystery of rownum in oracle (Oracle)
- Rewrite Oracle SQL to MYsql (MySQL)
- SQL Query: Group Time into timeslices then group by loginname then count distinct loginnames per timeslice (PostgreSQL)
- Slow Select over View (PostgreSQL)
- SQL Bulk insert with parent/child relationships, is order preserved?
- Changing int to Time from a DateDiff
- finding MAX(db_timestamp) query (PostgreSQL)
- AWS RDS MySql Simple query with composite index and date range took too long to execute out of ~8 millions data (MySQL)
- How do we select non aggregate columns in a query with a GROUP BY clause, which is not functionally dependent on columns in GROUP BY clause?
- MySql grouping returns incorrect result (MySQL)
- Change existing sql to left join only on first match
- Is there a way to avoid sorting for a query with WHERE and ORDER BY?
- MySQL GROUP BY with custom values (MySQL)
- postgresql locate random row inbetween two specific rows which follow a pattern (PostgreSQL)
- SQL condition base on number of associations
- Using ORDER BY FIELD and another (second) ORDER clause in one query (MySQL)
- Rave Reports Master Detail giving evariantoverflowerror
- Will adding a NONCLUSTERED INDEX as suggested by DTA improve performance?
- Hibernate 5 HQL translator for Oracle Spatial (Oracle)
- mysql 1093 error subselect work around improvement (MySQL)
- Oracle SQL Query tuning (Oracle)
- Predicate not pushed into left join on MSSQL (SQL Server)
- Record Count Different in VBA Versus Access
- Comparing a Date column with a datetime value
- Optimize Postgres Query with Indexes for large amounts of data (PostgreSQL)
- Android Room subquery in FROM clause not working as expected
- Please Explain SSRS SQL statement when dealing with date parameters ranges and null
- In MySQL, how to build index to speed up this query? (MySQL)
- How to show result based on other columns in SQL Server (SQL Server)
- Simple explanation of MySql code (MySQL)
- mysql tunning timestamp performance? (MySQL)
- difference between collection and association mapping in mybatis 3 (MySQL)
- Spring Hikari DB thread pool stuck in socket read (PostgreSQL)
- How to build an index for fast retrieval of data from files?
- Optimizing MySQL query with: join, where, group by, having (MySQL)
- Improve performance of NOT EXISTS in case of large tables
- DBMS_LOB.SUBSTR with filter on length(CLOB) results in ORA 06502 (Oracle)
- SQL Server : Apostrophe in WHERE clause (SQL Server)
- Indexes Without Where Clause
- SQL Server Timeout based on locking? (SQL Server)
- postgres: join against partitioned table (PostgreSQL)
- Mysql not equal (MySQL)
- Retrieving the start and end hour queries correctly in PostgreSQL Query (PostgreSQL)
- MySQL query to eliminate the use of this PHP code (MySQL)
- Convert Number to Date in SQL Server with Exception in Month End (SQL Server)
- Slow query inner join many tables HSQLDB
- Database query : [Union] / [or condition in where clause]
- Convert Number to Date in SQL Server with Exception in Month End (SQL Server)
- MYSQL/PHP count answers to reoccurring questions (MySQL)
- sqlite Query optimisation
- SQL Server 2005: Procedure much slower than function (SQL Server)
- SQL Server Distinct, selects all rows (SQL Server)
- Query optimization for non equal data connection
- Why does my MySQL server crash from this query? (MySQL)
- TSQL Last Record Efficiency Cursor, SubQuery, or CTE (SQL Server)
- How Do I JOIN a third Table called all_recipes using recipe_id KEY
- weird behavior: less rows are scanned without index on the columns in where condition (MySQL)
- Slow MySQL Performance when using >= and % in Varchar columns (MySQL)
- Need explanation of following query for deleting duplicate records
- Searching against Entity Attribute Value data
- PostgreSQL partitioning with joined table partition constraint not used in query plan (PostgreSQL)
- TSQL select from another table in the where (SQL Server)
- Optimize a SQL query with 3 tables
- MySQL: select max date from table2 and group by ID from table1 where table2 date can be null (MySQL)
- Does DISTINCT performs a full table scan with multiple expressions?
- How to get latest amount of sql subqueries (MySQL)
- Query Performance
- SELECT query take too much time to process (MySQL)
- Writing for holes in ranges
- Fastest way to find distinct matching records
- too much time to execute (MySQL)
- A complex SQL select based on multiple rows
- How to left join intermediate result table after filter ta(subquery)?
- MySQL order and group by varchar performance (MySQL)
- Using multilist column as foreign key reference
- Explain Plan Fails to Use Index (Oracle)
- Find the next oldest row in Redshift (SQL Server)
- Using query result data for another query
- Query to select random values with inner join on three tables (MariaDB)
- MySQL query with sub select in IN() clause gives not enough results (MySQL)
- MYSQL Query on timestamp ignore seconds (MySQL)
- Understanding HQL queries on collection objects
- SQL first order, then partition in over clause (SQL Server)
- SQL : Comma separated string in one row V/S multiple rows for single column in terms of performance
- MySQL query optimization and indexes (MySQL)
- create a table for each country that is needed mysql (MySQL)
- How to optimize query raw when updating in laravel?
- % express any characters, is there any special character for only one character? (Oracle)
- MySQL Crosstab / Pivot Aggregation. Removing counts based on column in other table (MySQL)
- Efficient full text search when the language is row dependant
- Is it more efficient to use the CASE in the original query or in a separate query?
- SQL performance: Which is quicker? IN() versus JOIN (MySQL)
- Differences in SQL Expressions and results
- How to use a function based index on a column that contains NULLs in Oracle 10+? (Oracle)
- SQL Slow Query Execution
- What do oracle database create in the table columns SYS_###########? (Oracle)
- Importing a massive 70GB table in MySQL, table remains unavailable for a long time after mysqlimport completes (MySQL)
- How can I improve this many to many Django ORM query and model set?
- Recursive SQL query to speed up non indexed query (SQL Server)
- Sunspot solr index search and index on range data
- Multiple INNER JOINS very slow Is there a better way?
- Left outer join and OR clause is slow. Is it possible to join after filtering?
- After changing a column from ntext to varchar(max) a query becomes slightly slower
- Sqlite query Smarter Rows with mathematics of cloned tables?
- Calcite Predicate Push Down
- MariaDB 10.4.13 slow performance compared to MySQL 5.7.30 (MySQL)
- Tips to enhance the performance of the following simply SQL query
- SQL: Joining on a group function
- How to find the maximum value of two interdependent columns
- Optimization SQL for getting data from two joined tables (usernames for user from id and user to id msgs from two tables)
- Defining Right and Left Tables in SQL JOINS
- Solr q results vs database sql results (Oracle)
- MySQL secondary index of timestamp type misses data (MySQL)
- The best way to do a MYSQL STRAIGHT_JOIN in the query builder of CodeIgniter [old version 2] (MySQL)
- Triple count and groupby using MySql on a simple table... is it possible in one query? (MySQL)
- select distinct a.* from table query (SQL Server)
- INSERT INTO with CURSOR within a TRIGGER
- How do I select rows in 1 table containing keywords from another table in SQL?
- Distance between POINT and nearest LINESTING (SQL Server)
- Slow SQL query because of ORDER BY not using index
- SQL to calculate author with most books
- SQL Avoid multiplication on inner joins with several returns
- Merge indexes in union
- JPA Entity and HQL JOIN command
- How to combine LIKE and IN in SQL?
- MySQL \"ON\" condition What does it do? (MySQL)
- Null Date performance
- SQL Server Performance issue (MEMOBJ_RESOURCEXACT) (SQL Server)
- SQL Multi Condition CTE Recursion
- Advice for implementation of a data search system for a static website with AWS infrastructure
- how to sum the column and get the rows based on month and year
- avoid select with subselect
- MySQL/PHP checking active relations (MySQL)
- Entity Framework vs Oracle nested query limitations (Oracle)
- Get IP addresses of established connections to Oracle 11 (Oracle)
- Best way to select fields to optimize queries
- Is it faster to do WHERE IN or INNER JOIN in Redshift
- SQL Server: Calculating Page Life Expectancy (SQL Server)
- MySQL: Index when joining to tables not being used (Performance optimizing question) (MySQL)
- Oracle FN_STRING_SPLITTER \"ORU 10027: buffer overflow, limit of 20000 bytes\" (Oracle)
- MySql Latitude and Longitude (MySQL)
- Oracle group by takes lot of time (Oracle)
- Optimize outer join in oracle view (Oracle)
- Adding another statement to WHERE clause in SQLite query causes freeze. Why?
- Lost connection during query MySQL (MySQL)
- Why the MySQL query slows down while using LIMIT with Order BY? (MySQL)
- Sorting by one to many relationship and return distinct records (PostgreSQL)
- How to efficiently and clearly check for existence of a row in Oracle? (Oracle)
- Optimize SQL subquery containing multiple inner joins and aggregate functions
- Select all records of a maximum column from codeigniter (Oracle)
- Cassandra IN Clause in a single partition
- How do I update a summary table with a trigger? (PostgreSQL)
- what happens during \"writing to net\"? (no replication, no external access) (MySQL)
- MariaDB dependent subquery in the not in subquery (MariaDB)
- MySQL specify every column in query rather than using SELECT * (MySQL)
- postgres: get random entries from table too slow (PostgreSQL)
- MySQL simple localization (MySQL)
- Optimizing SQLite multiple LIKE search for iOS
- ORACLE SQL Query regarding joining to a join (Oracle)
- H2: \"data conversion error\" in WHERE clause (Oracle)
- MySQL rowrank based on ORDER BY on 2 columns (MySQL)
- Filling gaps in result with empty data (PostgreSQL)
- Map two columns of a filtered second table to one Collection member
- Query does full table scan even with indexes
- How to speed up SQL when searching for previous date?
- Improve Efficiency Of This Query: Update With Joins and Subqueries (MySQL)
- In clause versus OR clause performance wise
- Why would increase in innodb_buffer_pool_size slow down MySQL? (MySQL)
- Returning a List of Customers and Average Rental Amounts (Sakila) (MySQL)
- SQL query with Like operator with Leading Wildcards
- In memory database supporting proprietary INSERT ALL oracle syntax (Oracle)
- Database design for time series (PostgreSQL)
- Make Hibernate discriminator value use bind variable instead of literal
- Poor Performance Querying a 8 GB table with large columns and many rows (MySQL)
- Query takes forever with a NOT EXISTS condition
- Mysql full text serach order by field ( not score ) performance speed up (MySQL)
- Query produces two query plans (at different times). How do I always produce the better query plan? (SQL Server)
- Query tuning SQL Server 2008 (SQL Server)
- mysql split a string in a where clause (MySQL)
- SQL Query to use a Case Statement within and Aggregate Function
- How to optimize SQL query more?
- JPA where in embeddable optimization (Hibernate, PostgreSQL) (SQL Server)
- JPQL to SQL using Hibernate update query cross join problem (PostgreSQL)
- Multiple COUNT() conditions for values on either side of a range
- Amazon EMR and Hive: Getting a \"java.io.IOException: Not a file\" exception when loading subdirectories to an external table
- SQL Query INNER JOIN WHERE vs AND
- Maria DB SQL group by and sum query is slow (MySQL)
- or operator in left join
- Code Optimization in sql
- Check Geopoint within geoFence and Distance in Java (MySQL)
- Using UNION to make 3 different outputs
- Couchbase Query with ORDER BY DESC and LIMIT is very slow
- Sequelize Custom Field seperated from tables
- System diagnostic sleep
- Performance of MySQL \"AS\" and not \"AS\" (MySQL)
- Optimize SELECT query index use, etc
- Postgres: avoid listing all columns (“must appear in the GROUP BY clause or be used in an aggregate function”) (PostgreSQL)
- Need help in improving the query
- Improve SELECT performance
- Can you return multiple COUNTs in one SQL statement?
- Customized function to Sum CSV values inside a column (MySQL)
- SQL Where IN Order 2 SubQuery
- How to join multiple select statements in SQL (Oracle)
- How to get mysql query optimizer to use an index without superfluous WHERE clauses (MySQL)
- MS ACCESS – Return a daily count of booked resources within a date range
- Inconsistent statistics on jsonb column with btree index (PostgreSQL)
- Query performance debuging (MySQL)
- Postgres does not use an index even less than 5% rows are returned (PostgreSQL)
- How to get only rows with max version_id without expensive subquery in postgres database? (PostgreSQL)
- Almost equal queries give different execution times (MySQL)
- Better solution for PARTITION BY?
- MySQL B TREE index slows down \"WHERE constant BETWEEN columnA AND columnB\" query (MySQL)
- Tuning oracle subquery in select statement (Oracle)
- SQL Server index question address lookup (SQL Server)
- DELETE Data from MYSQL older than X days with Unix time in miliseconds (MySQL)
- MySql Index working differently in range scan (MySQL)
- How to avoid coalesce for duplicate tables
- Postgresql doesnt use index (PostgreSQL)
- adding an additional item in SQL statement causes slow performance
- SQL select across multiple tables with max dates in each joined table (Oracle)
- Add column with default in postgresql without table level lock (PostgreSQL)
- MySQL not using my index (MySQL)
- Two way relationship in SQL with 2 tables and no duplicates
- MySQL ORDER BY columns across multiple joined tables (MySQL)
- Search query slow down performance due to lots of records in product table , please provide nice query in sql server to optimize given query (SQL Server)
- SQL whats faster for select: bitwise \"and\" or joins with bigint
- Does it make sense to have CASE .. END in an ORDER BY? (PostgreSQL)
- Oracle SQL: Indexes not being used (Oracle)
- MySql : Increase query execution time for pagination (MySQL)
- SQLAlchemy join 2 table
- MySQL Can using reserved words as table names decrease performance? (MySQL)
- SQL Union Count to Sum Data
- MySQL Query Optimization eliminate unnecessary joins (MySQL)
- what should be order of YEAR() MONTH() DAY() in a tsql where clause?
- Index match in query
- mySQL using 100% CPU (MySQL)
- What does a multiple count query in SQL return?
- How to optimize SQL query (Oracle Database) (Oracle)
- SQL: changing IN to EXISTS
- How to optimize this JOIN query that relies on date value?
- Access filter based on table relationships
- SQL Server subquery/CTE advice (SQL Server)
- Why does adding an index to one of the two keys used to join two tables make the execution time slower than not using any index at all? (MySQL)
- How to speed up queries on non indexed columns SQL
- MySQL Delete / Inner Join performance (MySQL)
- Performance issue joining system tables & DMVs on DB with many partitioned tables? (SQL Server)
- Compute aggregate on other table for each extracted record performance
- SQL Server 2012 SSIS Problems querying string from unicode only culture (SQL Server)
- Spark Dataframe partitions querying from Hbase using Phoenix
- PostgreSQL table inheritance and moving rows with SQLAlchemy (PostgreSQL)
- Improve `Update` sub query performance?
- MySQL: Query two fields with different lookup id using one lookup table (MySQL)
- Mysql slow perfomance on big table (MySQL)
- MYSQL: Make multiple counts from one select (MySQL)
- T SQL : check if data exists in table
- Can we use exist in a SQL query to search & delete the records from a table?
- How do you optimize a MySQL query that joins on itself and does a \"custom\" group by? (MySQL)
- Not in table between dates
- php mvc business logic need advice (MySQL)
- SQL Injections Web for Pentester (Pentesterlab)
- Using SQL index on left join
- SSRS How to pass values from multiple value parameter to a temp table? (SQL Server)
- MS ACCESS AVOIDING NOT IN
- Query to fetch old data (imported from identical dbs) and new data using joins (MySQL)
- SQL Selects on subsets
- SQL Server: If I stop a single long running update before it is finished, will it roll back automatically? (SQL Server)
- How Oracle handles (select/where) and a join execution plan (Oracle)
- Wrong result using sum at MySQL (MySQL)
- Postgres 9.3 slow aggregation (SQL Server)
- Is it possible to BREAK ON a column in addition to the one specified in SQL*Plus? (Oracle)
- Low maintainence alternatives to indexing a view that cant be indexed in SQL server? (SQL Server)
- MySQL Queries Running At Different Speeds (MySQL)
- MYSQL (NOT IN) query is very slow (MySQL)
- SELECT Performance (SQL Server)
- OPTION (RECOMPILE) is Always Faster; Why? (SQL Server)
- Group historical data
- Slow regex query on 80M record in PostgreSQL (PostgreSQL)
- MySQL pivot from two mysql results (MySQL)
- Best performance aproach for get the last records sorted by date
- How to improve execution time for this SQL query?
- Converting MySQL code to Access: GROUP_CONCAT and a triple JOIN (MySQL)
- Why could PostgreSQL 9.5s CUBE, ROLLUP and GROUPING SETS be slower than equivalent UNION? (PostgreSQL)
- SQL SUM (DISTINCT ...) on result set
- Difference in performance between two similar sql queries
- How to improve performance of multiple joined table in sql query
- Optimizing very slow PostgreSQL LEFT JOIN between two large tables (PostgreSQL)
- MySQL GROUP BY changes results (MySQL)
- How to improve my mysql query execution performance (MySQL)
- How to use an SQL Query with multiple joins and count with hibernate (PostgreSQL)
- Performance of update vs if exists then update
- GROUP BY ordering (MySQL)
- How having equal to count(*) works?
- SQL Query > sysdate
- Replacing not in with left join (MySQL)
- Create filter for most recent date using combined columns
- SQL Where exists clause without equality check
- Counting query optimization in mysql (MySQL)
- how to optimize an HQL query that join two big tables
- MySQL Where clause processing order (MySQL)
- Is it possible to rewrite this SQL query without nesting in the FROM
- Query with OR making query execution SLOW
- PSQL query syntax error because of multistep WHERE
- Mysql query is using some other index (MySQL)
- Performance issues with mysql + php (MySQL)
- Query performance with sorting in postgres (PostgreSQL)
- PDO a specific query is drastically slow compared to manual execution
- Which Select query will run faster
- MySQL hanging on large SELECT (MySQL)
- (Oracle) REGEXP_LIKE taking too long to lookup (Oracle)
- Mysql: Count rows for period of time (MySQL)
- How to optimize SQL query (SQL Server)
- Different explain plan in same cluster
- How to improve query performance when using NOT IN
- Eliminate subquery to improve query performance (PostgreSQL)
- SQL select performance top 1 VS select 1
- Laravel, SQL Server Distinct comma delimited list (SQL Server)
- Need to add the totals from each of these queries into a single total amount
- Speed up SQL Query, has worked
- MySQL Query Is Too Slow Or Times Out (MySQL)
- mysql: organize search in a big tree (MySQL)
- mysql How to forcefully change the order of evaluation of an inner join? (MySQL)
- How can i write this SQL query in CYPHER?
- Efficient SQL Query/Schema for a Leader Board (MySQL)
- The query time of a view increases after having fetched the last page from a view in Oracle PL/SQL (Oracle)
- Extreme Slowness with Linq on mass update
- MySQL: Usage of indices in UNION subselects (MySQL)
- Criteria Add all the tables from the entity class when it only needs part of it
- Optimize slow MySQL query to remove Using where; Using temporary; Using filesort (MySQL)
- Role of null in performance tuning
- MySQL Optimizing long IN statement (MySQL)
- Slow query with unexpected index scan (SQL Server)
- Can I have multi order index for composite/multi column index in MySQL? (MySQL)
- Why does column = upper(column) work in Oracle but not in MySQL? (MySQL)
- Difference between time intervals in QuestDb
- Why does this correlated subquery work? (SQLZOO Select within Select 7)
- 5 Tables > Displaying Certain Distinct Rows
- PostgreSQL 12 Using both Similarity an ts_query at the same time, better performance? (PostgreSQL)
- Running a query as a SQL Developer script from java and save scripts output (Oracle)
- If I add a WHERE 0 = 1 clause, does SQL Server know how to optimize? (SQL Server)
- MySql first result before and after result set (MySQL)
- Performance of multiple joins on the same table
- Need suggestions for writing an optimized SQL query (PostgreSQL)
- Need one chart with data not compared to each other
- Count number of LIKE matches per Entry (MySQL)
- Divide result of query depends of the data
- SQL Too many calls to subquery (MySQL)
- How to optimize a MySQL update which contains an \"in\" subquery? (MySQL)
- Adding Data from a Database to a dataGridView C# / SQL Server (Staff Rota) (SQL Server)
- mysql 5.7.16 on linux server is too slow compare with mysql 5.6.16 log on localhost (MySQL)
- Oracle optimizing query involving date calculation (Oracle)
- Using temp tables to improve inner join performance (Oracle)
- \"Select case\" performance issue
- Use of SQL Servers Stop Lists (SQL Server)
- Delete Query To Improve Performance
- Why does changing the where clause on this criteria reduce the execution time so drastically? (Oracle)
- MySQL update from select and further select and updates (MySQL)
- OLE DB provider [OraOLEDB.Oracle] for linked server [ORA] returned message ORA 00936: missing expression (Oracle)
- DB2 Foreign Keys Based on Bitwise Operations
- View takes more time comparing to a query
- Simple Database Query Is there a faster way without a cursor?
- FIltering for Largest Value (MySQL)