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mysql数据库 时间：2024-12-25 09:56:39
作者：文/会员上传
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#测试mysql函数能否少传参数DELIMITER //DROP FUNCTION test//CREATE FUNCTION test(a char(20),b char(20))RETURNS char(20)BEGINdeclare ret char(20);if a is null then
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#测试mysql函数能否少传参数
DELIMITER //
DROP FUNCTION test//
CREATE FUNCTION test(a char(20),b char(20))
RETURNS char(20)
BEGIN
declare ret char(20);
if a is null then
set ret="null";
else
set ret="not null";
end if;
return ret;
END
//
DELIMITER ;
#返回值
mysql> select test(a="2");
1054 - Unknown column 'a' in 'field list'
mysql> select test("2");
mysql> select test("2","1");
+---------------+
| test("2","1") |
+---------------+
| not null |
+---------------+
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