Question

我正在尝试将同一个表上的三个查询的结果相加以生成一个单独的报告。

SELECT b.BG_SEVERITY as Severity, count (b.BG_BUG_ID) as Total
FROM BUG b where
 b.BG_USER_12='QA3'
 group by b.BG_SEVERITY

SELECT s.BG_SEVERITY as Severity, count (s.BG_BUG_ID) as Total
FROM BUG s where
 s.BG_USER_12='QA1'
 group by s.BG_SEVERITY

SELECT a.BG_SEVERITY as Severity, count (a.BG_BUG_ID) as Total
FROM BUG a where
 a.BG_USER_12='QA2'
 group by a.BG_SEVERITY

每个查询的结果如下所示：

Severity   Total
1-Critical  4
2-High      94
3-Medium    23
4-Low       45

我希望结合/总结上述三个查询中的“总计”列。我可以使用SQL的哪些功能来执行此操作？

Answer 1

如果使用sql-server，您可以尝试使用union。像这样的东西：

SELECT
    Severity,
    SUM(Total)
FROM
    (
    SELECT b.BG_SEVERITY as Severity, count (b.BG_BUG_ID) as Total FROM BUG b where b.BG_USER_12='QA3' group by b.BG_SEVERITY
    UNION ALL
    SELECT s.BG_SEVERITY as Severity, count (s.BG_BUG_ID) as Total FROM BUG s where s.BG_USER_12='QA1' group by s.BG_SEVERITY    
    UNION ALL 
    SELECT a.BG_SEVERITY as Severity, count (a.BG_BUG_ID) as Total FROM BUG a where a.BG_USER_12='QA2' group by a.BG_SEVERITY
    ) tbl
GROUP BY
    Severity

Answer 2

您可以在条件中使用IN。

SELECT   b.BG_SEVERITY as Severity, 
         COUNT(b.BG_BUG_ID) as Total
FROM     BUG b 
WHERE    b.BG_USER_12 IN ('QA3','QA1','QA2')
GROUP BY b.BG_SEVERITY

如何将来自同一个表的三个不同查询的结果相加

2 个答案: