Indicates user-provided text. Comments can be inserted on a separate line, nested at the end of a Transact-SQL command line, or within a Transact-SQL statement. The server does not evaluate the comment.
Transact-SQL Syntax Conventions
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text_of_comment
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Is the character string that contains the text of the comment.
Use two hyphens (--) for single-line or nested comments. Comments inserted with -- are terminated by the newline character.
There is no maximum length for comments.
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A GO command included within a comment generates an error message.
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The following example uses the -- commenting characters.
-- Choose the AdventureWorks database.
USE AdventureWorks;
GO
-- Choose all columns and all rows from the Address table.
SELECT *
FROM Person.Address
ORDER BY PostalCode ASC; -- We do not have to specify ASC because
-- that is the default.
GO
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