SQL Comments – Geek Slack

Getting Started with SQL Server

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SQL Comments

In SQL, comments are used to annotate SQL code for better understanding and documentation. Comments are ignored by the SQL engine during execution.

Single-line Comments

SELECT * FROM Employees; -- This is a single-line comment

This is a single-line comment that follows a SQL statement.

/*
This is a multi-line comment
that spans across multiple lines
*/

This is a multi-line comment enclosed within /* and */ delimiters.

SELECT
    /* Selecting all columns */
    * 
FROM
    Employees;

This example demonstrates a comment within a SQL statement, providing additional context about the query.

Comments in SQL are essential for documenting code, explaining logic, and improving readability.
Single-line comments start with --, and multi-line comments are enclosed within /* and */ delimiters.
Comments should be concise and relevant to the code they annotate.
Comments are ignored by the SQL engine during execution, so they do not affect query performance.

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