/! MySQL-specific code / : comments « Introduction « MySQL Tutorial

1.	Introduction
2.	Select Query
3.	Database
4.	Table
5.	Table Join
6.	Subquery
7.	Insert Update Delete
8.	Logic Operator
9.	View
10.	Data Types
11.	Procedure Function
12.	Cursor
13.	Trigger
14.	Date Time Functions
15.	Comparison Functions Operators
16.	Aggregate Functions
17.	Cast Functions Operators
18.	Control Flow Functions
19.	Encryption Compression Functions
20.	Information Functions
21.	Math Numeric Functions
22.	Miscellaneous Functions
23.	String Functions
24.	Regular Expressions
25.	Data Dictionary
26.	MySQL Utilities
27.	Privilege

MySQL Tutorial » Introduction » comments

1.3.4./*! MySQL-specific code */

MySQL Server parses and executes the code within the comment.

Other SQL servers will ignore the extensions.

If you add a version number after the ! character, the syntax within the comment is executed only if the MySQL version is greater than or equal to the specified version number.

mysql>

mysql>

mysql> CREATE /*!32302 TEMPORARY */ TABLE t (a INT);

Query OK, 0 rows affected (0.02 sec)



mysql>

mysql> desc t;

+-------+---------+------+-----+---------+-------+

| Field | Type    | Null | Key | Default | Extra |

+-------+---------+------+-----+---------+-------+

| a     | int(11) | YES  |     | NULL    |       |

+-------+---------+------+-----+---------+-------+

1 row in set (0.00 sec)



mysql>

mysql>

mysql> drop table t;

Query OK, 0 rows affected (0.00 sec)



mysql>

1.3.comments
	1.3.1.	From a # character to the end of the line
	1.3.2.	From a '--' sequence to the end of the line
	1.3.3.	This syntax allows a comment to extend over multiple lines not be on the same line.
	1.3.4.	/! MySQL-specific code /

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/*! MySQL-specific code */ : comments « Introduction « MySQL Tutorial

/! MySQL-specific code / : comments « Introduction « MySQL Tutorial