Comments
Comments indicate user-provided text. There are two different types of
comments: the -- comment and the /*...*/ comment. Comments can be inserted on
a separate line, nested (-- only) at the end of a SQL command line, or
within a SQL statement. The comment is not evaluated by the server. Two
hyphens (--) is the SQL-92 standard indicator for comments.
Example
SELECT *
FROM table1 -- this is a comment
INNER JOIN table2 ON table1.c1 = table2.c1
/* this is another comment */
WHERE table1.c1 > 10
ORDER BY table1.c1
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