SET @v1 := SELECT COUNT(*) FROM user_rating;
SELECT @v1
当我执行此查询时set变量显示此错误。
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
用括号将该选择括起来。
SET @v1 := (SELECT COUNT(*) FROM user_rating);
SELECT @v1;
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