mysql - 将两个具有不同架构的 SELECT 语句的结果 "generated"连接到一个表中

Question

所以我有以下 SELECT 语句:

SELECT COUNT(A.Award) AS US, SUBSTRING(CAST(M.Year as char(4)), 0 , 4)  AS Decade
FROM Movies M, Awards A
WHERE {SOME WHERE CLAUSE}
GROUP BY Decade;

和

SELECT COUNT(*) AS Total, SUBSTRING(CAST(A2.Year as char(4)), 0 , 4) AS Decade
FROM Awards A2
WHERE {SOME WHERE CLAUSE}
GROUP BY Decade;

第一个是“生成”一个包含列(US、十年)的表，第二个是“生成”另一个包含列(总计)的表，十年)。我想加入这两个表，以便得到一个表(US、Total、Decade)。我该怎么做？

Answer 1

将它们放在子查询中并执行JOIN:

SELECT a.US, a.decade, b.total FROM

  (SELECT COUNT(A.Award) AS US, SUBSTRING(CAST(M.Year as char(4)), 0 , 4)  AS Decade
  FROM Movies M, Awards A
  WHERE {SOME WHERE CLAUSE}
  GROUP BY Decade ) AS a

INNER JOIN

  (SELECT COUNT(*) AS Total, SUBSTRING(CAST(A2.Year as char(4)), 0 , 4) AS Decade
  FROM Awards A2
  WHERE {SOME WHERE CLAUSE}
  GROUP BY Decade) AS b

ON a.decade = b.decade