EverSQL Performance Knowledge Base
EverSQL Database Performance Knowledge Base
Recent 500 database optimization question and answers
- tables-join---performance()
- How-can-I-optimize-this-mysql-operation?(MySQL)
- improve-mysql-select-query-with-order-by-option(MySQL)
- SQL-query-with-start-and-end-dates---what-is-the-best-option?(SQL Server)
- Subqueries-in-MySQL-creating-duplicate-results(MySQL)
- MySQL-WHERE-NOT-IN-extremely-slow(MySQL)
- SQL-Database-order-more-than-one-column-in-ASC()
- ASP-Web-API-Controller-with-Entity-Framework-very-slow-and-strange-results(SQL Server)
- CakePHP-3-left-join-and-union-in-same-query(MySQL)
- Function-index-does-not-work-in-oracle-where-it-is-used-with-other-operator(Oracle)
- Strange-behavior-or-RAND-in-MariaDB:-Single-RAND-delivers-more-than-1-result(MariaDB)
- Partial-text-user-search-with-sorting--how-can-I-fix-this?()
- T-SQL-Dateformat-//-Timespan()
- Need-help-understanding-SUM()
- Difference-in-two-SQL-query,-but-same-result()
- Oracle-:-How-to-immediately-get-the-first-results-from-slow-queries?(Oracle)
- NHibernate-one-to-many-on-joined-subclass-inherited-property()
- How-to-smear-the-results-of-a-query-efficiently(Oracle)
- Same-SQL-query-performed-in-different-times(SQL Server)
- Query-Speed-Issue-with-NOT-EXISTS-condition()
- Force-unique-key-in-view-to-avoid-merge-join()
- Fast-Query-with-Left-Join-To-Get-Record-With-Latest-Date(PostgreSQL)
- Which-is-better-in-performance-client-side-joins-or-server-side-joins()
- Calculate-concurrent-sessions-with-T-SQL(SQL Server)
- SQL-query-evaluates-COUNT(*)-differently-if-tables-are-defined-as-MyISAM-or-InnoDB(MySQL)
- Working-SQL-Server-2005-Query-Optimization(SQL Server)
- SQL-query-to-find-the-most-common-index-of-a-minimal-field()
- PostgreSQL-With-vs-SubQuery(PostgreSQL)
- Mysql-fast-insert,-slow-delete,-wrong-index(MySQL)
- How-to-optimize-mysql-query-using-php/mysql-eager-loading-or-similar-approach(MySQL)
- Sql-Sum-of-child-Items()
- how-do-i-improve-cross-join-with-20,000-records?()
- Index-Function-using-joins()
- Is-the-transfer-time-from-PostgreSQL-to-the-application-optimisable?(PostgreSQL)
- MySQL-Query-Fetch-Time-increases-when-LEFT-JOIN-with-big-table(MySQL)
- How-to-optimize-SELECT-statement-with-multiple-sub-queries(SQL Server)
- Linq-to-SQl-query-performance(SQL Server)
- SQLite-/-Java-Compare-most-recent-time-stamp-with-one-from-24hr-ago-for-each-name()
- How-to-determine-the-cause-of-AJAX-delay-on-my-site?(MySQL)
- Is-it-possible-to-GROUP_CONCAT-a-result-set-as-a-new-column?(MariaDB)
- Difference-between-not-exists-and-not-in()
- SQL---combine-two-columns-into-a-comma-separated-list()
- MySQL-ignore-index-even-with-use-index-or-force-index(MySQL)
- SQL---Comment-System-with-Revision-History(MySQL)
- SQL---For-Each-loop-in-a-query()
- Ajax-posting-notes-with-specific-id(MySQL)
- MySQL-alternate-to-group_concat?(MySQL)
- SQL-Server-Hekaton-Reclaim-Memory-Used-by-Dropped-Memory-Optimized-Tables(SQL Server)
- Need-help-in-writing-SQL-query(Oracle)
- Mysql-Innodb-count(*)-performace(MySQL)
- Why-is-SQL-Server-full-text-search-not-matching-numbers?(SQL Server)
- MySQL-group-by-&-order-by-&-limit-optimization(MySQL)
- Very-slow-WHERE-IN-query-on-very-large-table---postgresql-9.6(PostgreSQL)
- Get-specific-row-from-a-random-list-by-identifier()
- COUNT(*)-on-MyIsam-Table-with-FT-INDEX(MySQL)
- How-do-I-retrieve-json-object-from-PostgreSQL?(PostgreSQL)
- MySQL-cyclically-one-row-for-each-valid-user(MySQL)
- index-with-multiple-columns---ok-when-doing-query-on-only-one-column?()
- mysql-NOT-IN-QUERY-optimize(MySQL)
- how-to-model-data-/-indexes-to-find-timeslices-fast()
- how-to-rewrite-a-query-that-uses-a-subquery-on-self-as-a-join()
- SQLite-SELECT-very-slow-on-Windows-Phone()
- Mysql-performance-for-large-query-using-for-value-in-VS-multiple-queries(MySQL)
- Inner-join-order-by-performance-issue-in-Android-2.3()
- MySQL-performance-difference-between-JOIN-and-IN(MySQL)
- in-select-query-when-use-column-name-it-is-very-slow(SQL Server)
- Highlighting-MySQL-Data-Results(MySQL)
- doing-GROUP-BY-when-the-underlying-query-already-has-only-single-group()
- Check-value-existance-while-performing-a-UPDATE-query()
- SQL-Query-that-runs-fine-in-SSMS-runs-very-slow-in-ASP.NET(SQL Server)
- PostgreSQL-how-to-create-a-scalable-location-based-query(PostgreSQL)
- Unable-to-duplicate-slow-query-log-rows_examined()
- Hibernate-SQL-In-clause-making-CPU-usage-to-100%(SQL Server)
- Query-to-get-data-from-relational-databases-in-MySQL(MySQL)
- Select-by-datetime-range-is-very-slow-in-MySQL(MySQL)
- Why-some-dates-give-worse-performance-than-other-in-MS-SQL-Server(SQL Server)
- Optimized-querying-in-PostgreSQL(PostgreSQL)
- Creating-a-function-in-SQL-to-iterate-through-dates()
- Difference-between-LIKE-and-REGEXP-in-MYSQL(MySQL)
- Oracle-query-with-different-dates(Oracle)
- What-performance-can-I-expect-from-a-simple-query:-Simple-example-is-slow(SQL Server)
- Poor-Performance-from-MySQL-JOIN---How-to-Make-Improvements?(MySQL)
- How-can-I-calculate-average-with-condition-in-sql()
- SQL-multi-table-query-guidance()
- Counting-Distinct-Managers-Per-Country(Oracle)
- AM-I-on-the-right-path()
- Oracle-Common-Table-Expressions-(WITH)-within-BEGIN-and-END(SQL Server)
- I-am-trying-to-improve-the-performance-of-this-query-can-some-one-help-me-on-this-query()
- MySQL-IN-clause-using-sub-select-versus-list-of-values(MySQL)
- SELECT-COUNT-with-JOIN-optimization-for-tables-with->-100M-rows(MySQL)
- Update-table-from-2-Selects-from-a-different-database-with-thousands-of-rows-SQL()
- MySQL-Select-row-where-text-field-contains-number-bigger-than-X(MySQL)
- Best-query-to-exclude-existing-friends-from-query()
- SQL-Query---Combined-rows-with-selective-columns-[MySQL](MySQL)
- Querying-for-multiple-many-to-many-associates-in-MySQL(MySQL)
- MySQL-Long-First-Query-Time(MySQL)
- My-simple-MySql-query-doesnt-use-index(MySQL)
- mysql-order-by-query-issue(MySQL)
- Improving-SQL-cartesian-product-performance-by-reducing-columns()
- SQL-Server-query-to-filter-data-by-different-values-in-the-same-column(SQL Server)
- Using-a-query-on-a-joined-table-instead-of-actual-table()
- Optimize-JOIN-with-LEFT-JOIN(MySQL)
- Rails/mysql-SUM-distinct-records---optimization(MySQL)
- Mysql-full-text-serach-order-by-field-(-not-score-)-performance-speed-up(MySQL)
- Select-values-lower-than-another-one---Oracle(Oracle)
- Statements-vs-PreparedStatements-performance(Oracle)
- key-word/phrase-search-against-similarity-Matrix-in-SQLite()
- Rewrite-running-total-sql-query(Oracle)
- How-the-query-works()
- Get-the-first-and-last-posts-in-a-thread()
- SQL-query-->-LINQ()
- SQL-query-performance/SELECT-TOP-X-behavior()
- How-can-I-use-the-result-of-this-query-as-source-of-another-query-that-extract-n-random-records?(MySQL)
- Query-not-using-index-with-jsonb---Postgres(PostgreSQL)
- speed-up-query-MySQL(MySQL)
- Does-using-a-case-statement-in-an-update-in-the-presence-of-a-where-clause-make-it-less-efficient?(MySQL)
- Caching-inner-query-in-SQL(Oracle)
- How-can-I-optimise-this-slow-PostgreSQL-query(PostgreSQL)
- understanding-explain-plan-in-oracle(Oracle)
- Optimize-this-mysql-query-GROUP-BY-+-ORDER-BY-+-UNION-ALL(MySQL)
- How-to-optimize-this-SQL-query-to-filter-on-a-longtext/JSON-field()
- Replacement-for-Using-Except-in-nested-query-with-IN-in-mysql(MySQL)
- Mysql-Update-using-value-from-select(MySQL)
- MySQL---Figuring-out-what-indexes-to-use,-AND-not-working-as-expected(MySQL)
- MySQL-using-slower-index-for-query(MySQL)
- Select-top-1-subquery-with-parameters-(SQL)()
- MYSQL-Not-using-Possible-Keys(MySQL)
- SQL-Multiple-Joins-on-same-table-with-where-clause(SQL Server)
- Oracle-Query-Optimization-Help---Multi-Pass(Oracle)
- JPA-perfomance-with-case-insensitive-in-select()
- Find-distinct,-duplicate-values-in-SQL-and-show-them-all()
- SQL-query-much-slower-in-app-than-it-is-run-in-console()
- How-to-make-a-sequence-of-select,-update-and-insert-atomic-in-one-single-Cassandra-statement?()
- Speed-of-many-individual-updates-vs.-one-large-update(PostgreSQL)
- Can-I-improve-my-movie-selecting-SQL-query()
- PHP---Using-the-+=-operator-on-an-undefined-array-index()
- Slow-triple-inner-join()
- SQL-Query-Optimization-(Mysql-5.7)(MySQL)
- MySQL-GROUP-BY-slows-down-query-x1000-times(MySQL)
- How-to-optimize-SQL-without-indexes()
- Php-mysqli-extension-and-timestamp-index(MySQL)
- SQL-Optimization,-Nested-Query()
- How-to-speed-up-the-query-search-with-the-issue-of-GROUP-BY?()
- PostgreSQL-Match-any-strings(PostgreSQL)
- Why-does-MySQL-8-hold-locks-for-another-table,-even-though-transaction-is-completed-and-the-query-is-about-a-different-table?(MySQL)
- From-a-performance-perspective,-how-efficient-is-it-to-use-a-MySQL-temporary-table-for-a-highly-used-website-feature?(MySQL)
- How-does-\"OtherServer\"-in-SSDT-database-references-work?(SQL Server)
- Need-to-optimize-query-and-loop-the-dates()
- PostgreSQL-slower-than-expected(PostgreSQL)
- How-do-you-input-multiple-SELECT-outputs-into-a-FROM-clause-in-MySQL?(MySQL)
- GROUP_CONCAT()-to-fetch-a-Multidimensional-Array()
- Returning-a-List-of-Customers-and-Average-Rental-Amounts-(Sakila)(MySQL)
- Notification-system-in-PHP()
- Why-do-I-have-different-result-by-using-CASE-statement?()
- SQL-Server---Is-creating-an-index-with-a-unique-constraint-as-one-of-the-columns-necessary?(SQL Server)
- Left-join-appears-to-be-hindering-SQL-query-performance-tremendously()
- How-does-this-self-inner-join-query-is-working?()
- SQL-Server-:-dependent-subqueries(SQL Server)
- SQL-crosstab-query-for-numeric-attribute()
- Couchbase-Timeout-but-not-logged-in-system:completed_requests()
- Join-on-following-queries?()
- Oracle-Partition-Pruning-with-bind-variables(Oracle)
- Database---data-versioning-in-single-table(MySQL)
- SQL-query-works-even-if-it-should-fail(SQL Server)
- Dynamic-pivot-table-filtering-and-performance()
- Optimizing-this-mysql-query-by-rewriting?(MySQL)
- Clustering-Factor-and-Unique-Key(Oracle)
- How-to-return-multiple-columns-from-multiple-tables-grouped-with-aggregate-function(MySQL)
- Issues-with-grouping()
- Android-2.3.3-SQLite-infinite-loop()
- How-Optimize-Sum-SQL-Query?()
- Query-that-finds-the-oldest-driver()
- DATE()-MONTH()-etc.-functions-slow-down-query()
- MySQL-query-faster-in-DESC-order-than-ASC-order(MySQL)
- Select-rows-that-matches-multiple-and/or-conditions()
- How-to-perform-almost-the-same-query-N-times-without-rewriting-it-N-times?()
- What-Happens-If-MySQL-Server-Restarts-During-Trigger-Process(MySQL)
- How-to-improve-performance-on-SUM-from-float-values-in-MySQL?(MySQL)
- SQL---Get-value-for-a-specific-element-in-array()
- How-can-you-index-a-text-search-that-has-only-one-wildcard-at-the-beginning-of-the-search-term-(%TERM)?(MySQL)
- SQL-Delete-all-rows-in-a-table-based-on-another-table-and-another-column-value(MySQL)
- Firebird-Stored-Procedure-for-dynamically-selection()
- Filesort-while-using-primary-key-for-orderby()
- Changing-the-to-The-in-a-column()
- sum-a-value-on-another-distinct-value(MySQL)
- How-can-I-make-a-self-join-on-a-large-table-more-efficient?()
- What-is-wrong-with-this-join-of-a-table-to-itself?()
- Is-there-a-way-to-improve-this-query?-Joining-subquery-with-itself(MySQL)
- Improve-search-when-doing-joins.-Cluster-tables?(Oracle)
- SQL:-get-avg-result-from-last-N-(two)-entries()
- Self-Referencing-SQL-Query-with-Calculation(MySQL)
- SQL-Join-Challenge(SQL Server)
- How-to-avoid-Implicit-Type-Conversion()
- Remove-SQL-results-that-have-associated-\"time_worked\"-records(MySQL)
- Google-Data-Studio:-Show-individual-value-instead-of-sum()
- Column-aliases-in-where-clause-giving-invalid-column-name-error()
- Debugging-Slow-mySQL-query-with-Explain(MySQL)
- Improving-performance-for-sql-select-query(MySQL)
- I-would-like-to-ask-how-can-I-improve-my-code-in-access()
- How-to-speed-up-this-simple-mysql-query?(MySQL)
- Combine-separate-SQL-queries-together-filling-in-the-blanks(SQL Server)
- how-to-Optimize-query-inside-view()
- Indexes-for-SQL-query-with-WHERE-condition-and-GROUP-BY(PostgreSQL)
- mysql-postgresql-query-without-specifying-table-name-and-public-folder(MySQL)
- Count-is-slowing-down-query-too-much.-How-can-I-refactor-this?()
- SQL-Server-FETCH-NEXT-X-ONLY-based-on-a-specific-column(SQL Server)
- Mysql-Optimize-Query:-Trying-to-Get-Average-of-Subquery(MySQL)
- Laravel-Is-it-possible-to-improve-Auth::id()-query?()
- Struggling-to-debug-high-CPU-usage-on-Amazon-RDS-MySQL-instance(MySQL)
- With-multiple-sql-order-by-clause,-is-all-order-bys-run-even-if-earlier-order-by-has-proved-that-the-rows-are-not-equal?(SQL Server)
- Avoid-duplicate-data-in-SQLite3-with-a-covering-index()
- Displaying-the-currently-loaded-data-while-reading-data-from-a-table(SQL Server)
- Slow-postgres-query-with-multiple-joins-to-same-table(PostgreSQL)
- Super-Slow-MySQL---Need-Help!(MySQL)
- Unsure-how-to-approach-json-php-mysql-integration(MySQL)
- If-a-value-occurs-for-the-first-time-mark-1-else-0,-and-count-those-in-group()
- How-can-I-speed-up-a-DateTime-comparison-query-in-MySQL?(MySQL)
- How-to-make-query-fast-in-mysql(MySQL)
- low-cardinality-index-still-slows-query-down(MySQL)
- Oracle---How-to-check-my-date-field-value-has-time-portion-or-not(Oracle)
- Joomla!-(with-K2)-MySql---Error-when-generating(MySQL)
- Join-table-using-LIKE-or-RLIKE-in-Hive()
- Query-grows-slower-as-user-activity-increases()
- Simple-INSERT-Query-in-SQL-Server(SQL Server)
- Tuning-query-to-remove-joins-for-reporting(SQL Server)
- Aggregate-sampler-function-for-programmer-express-predictions(MySQL)
- How-can-I-optimize-this-SQL-query?()
- How-to-convert-Minutes-to-Hours-Minutes-and-Seconds-in-SQL?()
- How-to-increase-query-speed-with-using-like-command()
- Pivot-in-PostgreSQL(SQL Server)
- Removing-duplicate-records-from-JOIN-in-MS-Access()
- How-to-do-a-subquery-in-group_concat()
- Granularity-of-data-rows(SQL Server)
- Slow-performance-on-using-parameters-in-linq-to-entities(SQL Server)
- Iterate-till-parent-in-mysql-works-but-not-if-given-value-is-array(MySQL)
- Writing-set-based-SQL-query-without-set-operations-(EXCEPT,-INTERSECT)(SQL Server)
- Mysql-query-with-different-searchs-in-same-table(MySQL)
- MySQL-Full-table-scan(MySQL)
- Improve-PostgresSQL-aggregation-query-performance(PostgreSQL)
- pg_stats-is-huge-and-slowing-PostgreSQL-server-down....-What-do-I-do?(SQL Server)
- How-to-speed-up-query-to-Oracle-(selection-of-all-table_names-that-contain-FK-on-the-table)(Oracle)
- Select-Name-instead-OF-ID-in-table-with-ID-Ref-Column-SQL()
- How-write-a-query-which-receives-data-group-by-date?()
- Can-this-MySQL-subquery-be-optimised?(MySQL)
- Sql-Sum-of-child-Items()
- Optimize-runtime-with-index(Oracle)
- T-SQL-with-three-sub-queries-causing-long-execution-time,-any-combination-of-2-is-near-instant(SQL Server)
- SQL-Server-2012-Estimated-Row-Numbers-Much-Different-than-Actual(SQL Server)
- MYSQL-slow-left-join-on-function-calls(MySQL)
- Why-when-using-MS-Access-to-query-data-from-remote-Oracle-DB-into-local-table-takes-so-long(Oracle)
- Having-trouble-to-display-Average-sales-including-the-Region-with-no-sales()
- How-to-create-a-temporary-table()
- Correct-way-to-query-a-Cosmos-DB-Table()
- PHP-+-SQL,-correct-tre-with-parent-and-child-category-and-item(MySQL)
- Speed-up-Join-tables()
- Query-causing-Database-lock-problem-(php/Mysql)(MySQL)
- How-to-optimize-or-speed-up-my-subquery-in-mysql-or-in-php(MySQL)
- How-can-I-combine-2-queries?()
- Mysql-multiple-OR-statements(MySQL)
- Optimise-SQL-query:-find-items-that-are-geographically-touching,-but-without-association()
- MYSQL-result-formatting(MySQL)
- esper-detect-change-in-value-of-Event()
- SQL:-Select-MAC-stored-as-bigint-that-contains-part-of-a-string(MySQL)
- Altering-Tables-in-From-clause-and-altering-filters-affects-SQL-performance?()
- Simple-query-very-slow-due-to-order-by()
- mySQl,-Query:-How-to-customize-selection-from-database?(MySQL)
- Optimization-in-sql-server-query(SQL Server)
- MySQL---Faster-method-for-this-complex-query?(MySQL)
- Performance-problems-temporarily-fixed-by-sp_updatestats,-despite-daily-sp_updatestats-execution(SQL Server)
- SQL-Self-Join---one-to-many---with-dates()
- Firebase-(nosql)-checking-if-key-contains-substring()
- MySQL-involving-crazy-multiple-self-joins(MySQL)
- Querying-SQLite-DB-as-fast-as-manipulating-pandas.Dataframe-in-Python()
- ASP.NET-/-SQL-Server---Timeout-expired-while-searching(SQL Server)
- Calculate-overlapping-time-across-multiple-records()
- NHibernate-SetFirstResult-causes-duplicate-results()
- What-is-the-most-efficient-way-to-get-the-minimum-of-multiple-columns-on-SQL-Server-2005?(SQL Server)
- MYSQL-query-optimization---how-to-fetch-unique-column-from-right-table-of-join(MySQL)
- Oracle-select-statement-syntax(Oracle)
- Slow-joins,-index-not-being-used-on-a-varchar-column(MySQL)
- How-can-I-optimize-performance-on-a-MySQL-ndbcluster?(MySQL)
- SQL-Query-performance-with-inner-queries()
- SQL-How-to-get-the-result-from-the-statement-faster?()
- (Oracle)-REGEXP_LIKE-taking-too-long-to-lookup(Oracle)
- A-SELECT-statement-as-subquery-with-two-conditions()
- how-duplicates-are-getting-eliminated-while-using-subquery()
- Why-is-Linq-query-setting-my-Arithabort-options-to-false?()
- Please-help-combining-with-clause-scans-into-one()
- Slowness-in-SQL-query-with-subquery()
- Oracle-SQL-consumes-huge-temp-space(Oracle)
- High-processing-times-for-5%-of-the-total-records-using-Spring-4.3.0-JDBC-template-to-insert-or-update-logic()
- Mysql:-Using-nested-select-query-in-update-query-creates-deadlocks(MySQL)
- Improving-a-MySQL-query-that-result-in-a-Lock-wait-timeout-exceeded;-try-restarting-transaction(MySQL)
- How-to-create-\"pages\"-for-search-results-in-HTML,-PHP,-Javascript,-MySQL(MySQL)
- MySQL/MariaDB-Order-rows-by-score(MySQL)
- Query-to-find-duplicate-rows-in-a-table()
- PHP-MySQL-Hierarchy-Data-group_concat(MySQL)
- Mysql:-Select-range-between-dates-and-adding-extra-rows-(not-days)-to-the-range(MySQL)
- Tracking-user-actions-for-reward/achievement-system(SQL Server)
- Access---Reference-a-Access-Form-unbound-textbox-in-TSQL-Server-Query?(SQL Server)
- Express-query-using-doctrine-query-builder()
- How-to-rewrite-where-subquery-condition-in-JPQL()
- Problem-With-Parameter-Multiplied-By-Negative-Value-In-Where-Clause-in-OLE-DB-Source(SQL Server)
- How-to-index-Postgresql-query-with-multi-column-and-order(PostgreSQL)
- Operand-data-type-varchar-is-invalid-for-sum-operator()
- Optimize-splitting-a-column-only-when-a-character-is-present()
- HIVE_CURSOR_ERROR:-Please-reduce-your-request-rate()
- Combine-two-linestrings-in-different-rows-using-PostGIS(PostgreSQL)
- Hive--Quicker-way-to-check-for-data()
- How-to-convert-a-MySQL-select-statement-with-a-subquery-to-the-same-table-into-an-update-statement?(MySQL)
- Which-is-faster-insert-query-or-update-in-sql?(SQL Server)
- Rewrite-as-one-mySQL-query-where-results-of-1st-query-needed-for-2nd-query(MySQL)
- Update-and-insert-performance-with-partial-indexes()
- Best-practises-to-speed-up-join-tables-on-datetime-range()
- Rewrite-inline-query-into-stored-procedure()
- What-means-(timeout)-in-\"strace\"--output?-(mysql-/-php-analyse)(MySQL)
- mysql-query-is-taking-long-time(MySQL)
- Mysql-count-slow-when-filter-by-category(MySQL)
- WHERE-clause-on-join-adding-4-seconds-to-execution-time()
- How-to-get-a-record-depending-of-an-other-record-without-CTE-and-UNION()
- Delete-OUT-time-value-if-it-less-than-IN-time()
- MySQL-many-to-many-JOIN-returning-duplicates(MySQL)
- mysql-grouping-mre-than-one-query(MySQL)
- optimize-sql-code()
- Joining-table-twice-makes-the-query-slow()
- Delete-where-records-not-exists-in-other-table()
- Eliminating-effectively-redundant-entries-with-Inner-Join()
- Google-BigQuery:-Data-drop-when-streaming-insert-right-after-copy-to-same-table-with-WRITE_TRUNCATE()
- Updating-EndDates-with-StartDate-on-next-line-with-same-ID-in-temporal-tables(SQL Server)
- How-to-select-vertical-data-in-MySQL-table(MySQL)
- Postgresql-select-max-query-takes-long-time(PostgreSQL)
- mySQL-Query-code-and-indexing-optimisation(MySQL)
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