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MySQL & MariaDB

You can use # or /*...*/ to add comments to the queries.

Note that starting from MySQL Server 3.23.3, it supports a variant of the ‘--’ comment style. That is, the ‘--’ start-comment sequence must be followed by a space (or by a control character such as a newline).

For example:

mysql> SELECT 1+1;     # This comment continues to the end of line

mysql> SELECT 1+1;     -- This comment continues to the end of line

mysql> SELECT 1 /* this is an in-line comment */ + 1;

mysql> SELECT 1+

/*

this is a

multiple-line comment

*/

1;

For more information, please refer to:

https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-comments.html

https://dev.mysql.com/doc/refman/8.0/en/comments.html

 

PostgreSQL, Oracle, SQLite & SQL Server

To add comments to the queries, please use -- or /*...*/ .

 

MongoDB

To add comments to the queries, please use // or /*...*/ .

 

Redis

To add comments to the queries, please use //.