MySQL结合选择总和和选择查询

Question

我想根据先前的查询为每行总计4个单元格，这将把选择减少到重要的行。

基本上，我需要结合这两个查询（它们可以独立工作）：

SELECT columnx, SUM(`column1`+ `column2` + `column3` + `column4`) as total 
                FROM table GROUP BY columnx


SELECT * FROM (SELECT * FROM table ORDER BY columny DESC LIMIT 5) t 
                ORDER BY CASE
                when `pos` = 'PG' then 1
                when `pos` = 'SG' then 2
                when `pos` = 'SF' then 3
                when `pos` = 'PF' then 4
                else 5
                end asc

我试图用第二个查询替换“表”，但这可能不是正确的方法，因为我在这里遇到错误。

SELECT columnx, SUM(`column1`+ `column2` + `column3` + `column4`) as total FROM 
                  (( SELECT * FROM (SELECT * FROM table ORDER BY columny DESC LIMIT 5) t 
                  ORDER BY CASE
                  when `pos` = 'PG' then 1
                  when `pos` = 'SG' then 2
                  when `pos` = 'SF' then 3
                  when `pos` = 'PF' then 4
                  else 5
                  end asc) 
               GROUP BY columnx

Answer 1

您应该在第一个查询中为块替换table创建别名。

SELECT u.columnx, SUM(u.`column1`+ u.`column2` + u.`column3` + u.`column4`) as total 
FROM (SELECT t.* FROM (SELECT * FROM table ORDER BY columny DESC LIMIT 5) t 
ORDER BY CASE
 WHEN t.`pos`='PG' THEN 1
 WHEN t.`pos`='SG' THEN 2
 WHEN t.`pos`='SF' THEN 3
 WHEN t.`pos`='PF' THEN 4
ELSE 5
END ASC) u GROUP BY u.columnx