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A comment is an arbitrary sequence of characters beginning with two consecutive hyphen characters and extending to the end of the line. For example:
-- This is a standard SQL comment
A comment is removed from the input stream before further syntax analysis and is effectively replaced by white space.
Alternatively, C-style block comments can be used:
/* multiline comment
* with nesting: /* nested block comment */
*/
where the comment begins with /* and extends to the matching occurrence of */. These block comments nest, as specified in the SQL standard but unlike C, so that one can comment out larger blocks of code that may contain existing block comments.