-- (Comment) (Transact-SQL)
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.
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Transact-SQL Syntax Conventions
Syntax
-- text_of_comment
Arguments
- text_of_comment
Is the character string that contains the text of the comment.
Remarks
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. The following table lists the keyboard shortcuts that you can use to comment or uncomment text.
Action |
Standard |
|---|---|
Make the selected text a comment |
CTRL+K, CTRL+C |
Uncomment the selected text |
CTRL+K, CTRL+U |
For more information about keyboard shortcuts, see SQL Server Management Studio Keyboard Shortcuts.
For multiline comments, see /*...*/ (Comment) (Transact-SQL).
Examples
The following example uses the -- commenting characters.
-- Choose the AdventureWorks2012 database.
USE AdventureWorks2012;
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