如何将两个不同表中的两个选择语句显示到一个带列的表中

Question

我有一个表 t1，我想按年、月找出几列的总和。

SELECT 
         SUM(SA) as SA,
        SUM(TM) as TM,
        SUM(ST) as ST       
    FROM t1
GROUP BY YEAR(createdDate), MONTH(createdDate)
ORDER BY YEAR(createdDate), MONTH(createdDate)

第二个表 t2 是

SELECT 
         SUM(BA) as BA,
        SUM(TR) as TR   
    FROM t2
GROUP BY YEAR(createdDate), MONTH(createdDate)
ORDER BY YEAR(createdDate), MONTH(createdDate)

各个表的输出是

表格1

76.45   416.51  2484.89
80.28   296.18  1909.83
78.57   342.27  4798.71

表 2

1924.9  0
1689.85 0
4608.69 0

但我想表示为单个表

76.45   416.51  2484.89    1924.9   0
80.28   296.18  1909.83    1689.85  0
78.57   342.27  4798.71     4608.69 0

我没有要加入的共同列。所以我必须不加入

Answer 1

我不相信你的例子是完整的，你可能不需要一个FULL OUTER JOIN但直到知道更多就足够了。 关键是你有年和月作为共同的潜在列

SELECT
      coalesce(a.yr,b.yr) yr
    , coalesce(a.mn, b.mn) mn
    , a.SA, a.TM, a.ST, b.BA, b.TR
FROM (
      SELECT
            YEAR(createdDate) yr
          , MONTH(createdDate) mn
          , SUM(SA) AS SA
          , SUM(TM) AS TM
          , SUM(ST) AS ST
      FROM t1
      GROUP BY
            YEAR(createdDate)
          , MONTH(createdDate)
      ) a
      FULL OUTER JOIN (
            SELECT
                  YEAR(createdDate) yr
                , MONTH(createdDate) mn
                , SUM(BA) AS BA
                , SUM(TR) AS TR
            FROM t2
            GROUP BY
                  YEAR(createdDate)
                , MONTH(createdDate)
      ) b ON a.yr = b.yr
                  AND a.mn = b.mn

另一种可能性是您正在过滤特定日期范围（例如 2014、2015 和 2016），并且您知道所有这些年份和月份的两个表中都有数据，因此您可以使用INNER JOIN ：

SELECT
      a.yr, a.mn
    , a.SA, a.TM, a.ST, b.BA, b.TR
FROM (
      SELECT
            YEAR(createdDate) yr
          , MONTH(createdDate) mn
          , SUM(SA) AS SA
          , SUM(TM) AS TM
          , SUM(ST) AS ST
      FROM t1
      where somedatecolumn >= '20140101' and somedatecolumn < '20170101'
      GROUP BY
            YEAR(createdDate)
          , MONTH(createdDate)
      ) a
      INNER JOIN (
            SELECT
                  YEAR(createdDate) yr
                , MONTH(createdDate) mn
                , SUM(BA) AS BA
                , SUM(TR) AS TR
            FROM t2
            where somedatecolumn >= '20140101' and somedatecolumn < '20170101'
            GROUP BY
                  YEAR(createdDate)
                , MONTH(createdDate)
      ) b ON a.yr = b.yr
                  AND a.mn = b.mn

Answer 2

SELECT  YEAR(createdDate) cYear, MONTH(createdDate) cDate,
     SUM(SA) as SA,
    SUM(TM) as TM,
    SUM(ST) as ST,
    T.BA,T.TR       
FROM t1 LEFT JOIN  (SELECT YEAR(createdDate) cYear, MONTH(createdDate) cDate,
     SUM(BA) as BA,
    SUM(TR) as TR   
FROM t2 GROUP BY YEAR(createdDate), MONTH(createdDate) )T ON .cYear=YEAR(t1.createdDate) AND T.cDate=MONTH(t1.createdDate) GROUP BY YEAR(t1.createdDate), MONTH(t1.createdDate),T.BA,T.TR ORDER BY YEAR(t1.createdDate), MONTH(t1.createdDate)