主表

                 人名表

按照常規(guī)查詢

SELECT s.SName, c.CName,s2.SCgrade

  FROM S s INNER JOIN SC s2 ON s2.SNo = s.SNo INNER JOIN C c ON c.CNo = s2.CNo

那么結(jié)果是這樣的

但是這是橫表 不是我想看到的結(jié)果。

我們要看到這樣的結(jié)果：

那么怎么辦呢？
第一種寫法：

復(fù)制代碼 代碼如下:

SELECT w.SName,
sum(case when w.CNo= 1 then w.SCgrade ELSE 0 END) AS '語文',
sum(case WHEN w.CNo =2 THEN w.SCgrade ELSE 0 END) AS '數(shù)學(xué)',
sum(case when w.CNo= 3 then w.SCgrade ELSE 0 END) AS '英語'
FROM
(SELECT s.SNo,s.SName, s2.CNo, s2.SCgrade FROM s s INNER JOIN SC s2 ON s2.SNo = s.SNo WHERE s.SNo IN (SELECT c.SNo FROM sc c GROUP BY c.SNo ))
AS w GROUP BY w.SName

復(fù)制代碼 代碼如下:

SELECT s.SName,
sum(case when s2.CNo= 1 then s2.SCgrade ELSE 0 END) AS '語文',
sum(case WHEN s2.CNo =2 THEN s2.SCgrade ELSE 0 END) AS '數(shù)學(xué)',
sum(case when s2.CNo= 3 then s2.SCgrade ELSE 0 END) AS '英語'
FROM
S s INNER JOIN SC s2 ON s2.SNo = s.SNo
INNER JOIN C c ON c.CNo = s2.CNo
GROUP BY s.SNo,
s.SName