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MySQL Tutorial/Procedure Function/Operator - История изменений
2026-04-04T04:00:28Z
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в 13:44, 26 мая 2010
2010-05-26T13:44:56Z
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Admin: 1 версия
2010-05-26T09:53:33Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Boolean operator: NOT==<br />
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<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
mysql> delimiter $$<br />
mysql><br />
mysql><br />
mysql> CREATE PROCEDURE myProc()<br />
-> BEGIN<br />
-> DECLARE a INT DEFAULT 2;<br />
-> DECLARE b INT DEFAULT 3;<br />
-> DECLARE c FLOAT;<br />
-><br />
-> IF NOT (a=b) THEN<br />
-> SELECT "a is not equal to b";<br />
-> END IF;<br />
-> END$$<br />
Query OK, 0 rows affected (0.00 sec)<br />
mysql><br />
mysql> delimiter ;<br />
mysql> call myProc();<br />
+---------------------+<br />
| a is not equal to b |<br />
+---------------------+<br />
| a is not equal to b |<br />
+---------------------+<br />
1 row in set (0.02 sec)<br />
Query OK, 0 rows affected (0.02 sec)<br />
mysql> drop procedure myProc;<br />
Query OK, 0 rows affected (0.00 sec)<br />
mysql></source><br />
<br />
<br />
<br />
== Logic operator==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
mysql><br />
mysql> delimiter $$<br />
mysql><br />
mysql> CREATE PROCEDURE myProc()<br />
-> BEGIN<br />
-> DECLARE a INT DEFAULT 2;<br />
-> DECLARE b INT DEFAULT 3;<br />
-> DECLARE c FLOAT;<br />
-><br />
-> IF (a<b) THEN<br />
-> SELECT "a is less than b";<br />
-> END IF;<br />
-> END$$<br />
Query OK, 0 rows affected (0.00 sec)<br />
mysql><br />
mysql> delimiter ;<br />
mysql> call myProc();<br />
+------------------+<br />
| a is less than b |<br />
+------------------+<br />
| a is less than b |<br />
+------------------+<br />
1 row in set (0.00 sec)<br />
Query OK, 0 rows affected (0.02 sec)<br />
mysql> drop procedure myProc;<br />
Query OK, 0 rows affected (0.00 sec)<br />
mysql><br />
mysql><br />
mysql></source></div>
Admin