[Solved] What does a dot (.) means after a numeric value in Oracle?

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What does a dot (.) means after a numeric value in Oracle?

Database type:

This is my first time using an ORACLE SQL. I came across with a query like this :

SELECT *
FROM TABLE_A
WHERE COLUMN_A = 1.
AND COLUMN_B <> 0.

Can anyone explain me what does a dot (.) after those integers means? Will it make any difference if I don't put a dot (.)?

Thanks in advance :)

How to optimize this SQL query?

The following recommendations will help you in your SQL tuning process.
You'll find 3 sections below:

  1. Description of the steps you can take to speed up the query.
  2. The optimal indexes for this query, which you can copy and create in your database.
  3. An automatically re-written query you can copy and execute in your database.
The optimization process and recommendations:
  1. Avoid Selecting Unnecessary Columns (query line: 2): Avoid selecting all columns with the '*' wildcard, unless you intend to use them all. Selecting redundant columns may result in unnecessary performance degradation.
  2. Create Optimal Indexes (modified query below): The recommended indexes are an integral part of this optimization effort and should be created before testing the execution duration of the optimized query.
Optimal indexes for this query:
CREATE INDEX table_a_idx_column_a_column_b ON TABLE_A (COLUMN_A,COLUMN_B);
The optimized query:
SELECT
        * 
    FROM
        TABLE_A 
    WHERE
        TABLE_A.COLUMN_A = 1. 
        AND TABLE_A.COLUMN_B <> 0.

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* original question posted on StackOverflow here.