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我有这2个表SQL两人在另一个表中一个表引用同一列的列
tbl_link
pID | fID_a | fID_b | link_desc
1 | 1 | 2 | aa + bb
tbl_structure
pID | desc
1 | a
2 | b
fID_a和fID_b外键为PID在tbl_structure fID_a不允许NULL值,而fID_b确实
我想查询结构时检索结构2的递减1
此刻我的SQL查询看起来像这样
SELECT a.link_desc, tbl_structure.desc FROM tbl_strukture
LEFT JOIN tbl_link as a ON tbl_structure.pID = a.fID_a
LEFT JOIN tbl_link as b ON tbl_structure.pID = b.fID_b
WHERE tbl_structure.pID = 1
但我只能得到与pID 1结构的desc!
感谢您的帮助!
...其中s1.pID = 1和它的作品!谢谢! – Markus
@MarkusHölzner不客气。很高兴帮助:) – peterm