如何使用mysql将查询结果存储在变量中

SET @v1 := SELECT COUNT(*) FROM user_rating;

SELECT @v1

当我使用set变量执行此查询时,将显示此错误。

Error Code : 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use

near 'SELECT count(*) FROM user_rating' at line 1

Execution Time : 00:00:00:000

Transfer Time : 00:00:00:000

Total Time : 00:00:00:000

(1 row(s) returned)

Execution Time : 00:00:00:343

Transfer Time : 00:00:00:000

Total Time : 00:00:00:343

回答:

用括号括起来的选择。

SET @v1 := (SELECT COUNT(*) FROM user_rating);

SELECT @v1;

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