MySQL仅在满足条件的情况下运行select语句

Question

可以执行以下操作吗？无法为我工作

SELECT * FROM DB_1593 WHERE DB_1593_field_0_3 = '--skills--' IF('--dateTime--' < NOW())

Answer 1

尝试一下：

SELECT  * 
FROM    DB_1593 
WHERE   DB_1593_field_0_3 = '--skills--' 
AND     '--dateTime--' < NOW()

甚至可以奏效：

SELECT  * 
FROM    DB_1593 
WHERE   DB_1593_field_0_3 = '--skills--' 
AND     IF('--dateTime--' < NOW())

Answer 2

您可以尝试以下查询：

SELECT * FROM DB_1593 
WHERE DB_1593_field_0_3 = '--skills--' AND IF('--dateTime--' < NOW())

Answer 3

您可以将IF子句用作

DECLARE @COLUMN_NAME = 2

IF (@COLUMN_NAME <= 3)
    Select * FROM DB_1593 WHERE DB_1593_field_0_3 = '--skills--'

引用https://www.guru99.com/sql-server-if-else.html