是否有任何sql子查询语法允许您从字面上定义临时表？
例如,像
SELECT
MAX(count) AS max,COUNT(*) AS count
FROM
(
(1 AS id,7 AS count),(2,6),(3,13),(4,12),(5,9)
) AS mytable
INNER JOIN someothertable ON someothertable.id=mytable.id
这将节省必须执行两个或三个查询：创建临时表,将数据放入其中,然后在连接中使用它.
解决方法
我想你可以用几个SELECT和UNIONs做一个子查询.
SELECT a,b,c,d
FROM (
SELECT 1 AS a,2 AS b,3 AS c,4 AS d
UNION ALL
SELECT 5,6,7,8
) AS temp;
