2

tableAとtableBという2つのテーブルがあります。両方のテーブルには、pointAとpointBというファイルがあります。列pointAとpointBの中で最高値と最低値を見つけるために、単一のクエリが必要です。

 tableA
 idA    pointA
 1        20
 2        12
 3        41
 4        8     


 tableB
 idB    pointB
 1        24
 2        74
 3        2
 4        16

このような結果を得たい

 HIGHEST     LOWEST
    74         2
4

3 に答える 3

4

試す：

SELECT MAX(point) as HIGHEST, MIN(point) as LOWEST
FROM
  (SELECT pointA as point FROM tableA
   UNION
   SELECT pointB as point FROM tableB) t
于 2012-04-10T11:09:50.900 に答える
1 
select max(pointB) AS result from tableB
union
select min(pointA) AS result from tableA
于 2012-04-10T11:07:31.810 に答える
1 
SELECT MAX(high) AS highest
     , MIN(low)  AS lowest
FROM
  ( SELECT MAX(pointA) AS high
         , MIN(pointA) AS low
    FROM tableA
  UNION ALL
    SELECT MAX(pointB) 
         , MIN(pointB) 
    FROM tableB
  ) AS tmp
于 2012-04-10T11:12:34.907 に答える