我有一个名为Story的表
sID | sName | sView
1 | s1 | 1
2 | s2 | 11
3 | s3 | 142
4 | s4 | 152
表格章节:
chID | sID | chName | chContent
1 | 1 | ch1 | aaa
2 | 2 | ch2 | aaa
3 | 3 | ch3 | aaa
4 | 1 | ch4 | aaa
5 | 3 | ch5 | aaa
6 | 1 | ch6 | aaa
7 | 2 | ch7 | aaa
NaviteQuery:
SELECT s.*, MAX(c.chID) as chapterID FROM Story s
LEFT JOIN Chapter c ON s.sID = c.sID
GROUP BY s.sID
结果:
sID | sName | sView | chapterID
1 | s1 | 1 | 6
2 | s2 | 11 | 7
3 | s3 | 142 | 5
4 | s4 | 152 | null
但是您应该得到一个'SELECT s'。 *, C。 * FROM ....',谁可以帮助我!!!!
答案 0 :(得分:0)
您可以用一些不同的方式编写它。例如,您可以使用它:
SELECT s.*, c.* FROM Story s
LEFT JOIN (SELECT * FROM Chapter c INNER JOIN (SELECT MAX(c.chID) as chapterID FROM Story s
LEFT JOIN Chapter c ON s.sID = c.sID
GROUP BY s.sID) d ON c.chID = d.chapterID) c ON s.sID = c.sID