SET @v1 := SELECT COUNT(*) FROM user_rating;
SELECT @v1
当我使用set
变量执行这个查询时,显示了这个错误。
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
发布于 2012-04-09 15:50:39
用括号将选择括起来。
SET @v1 := (SELECT COUNT(*) FROM user_rating);
SELECT @v1;
发布于 2014-04-25 08:19:07
此外,如果您想通过一个查询一次设置多个变量,您可以使用另一个语法来设置变量,如下所示:SELECT @varname:=value
。
一个实际的例子:
SELECT @total_count:=COUNT(*), @total_price:=SUM(quantity*price) FROM items ...
发布于 2014-04-28 06:45:54
使用这个
SELECT weight INTO @x FROM p_status where tcount='value' LIMIT 1;
经过测试,工作正常。
https://stackoverflow.com/questions/10070406
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