我有两张桌子:
Table1
id | col1 | col2 | other_id
---------------------------
1 | val1 | val2 | 2
2 | val3 | val4 | 3
Table2
id | col3 | other_id
--------------------
1 | val5 | 4
我想以这种方式加入这两个表:
id | col1 | col2 | col3 | other_id
-----------------------------------
1 | val1 | val2 | NULL | 2
2 | val3 | val4 | NULL | 3
1 | NULL | NULL | val5 | 4
我创建了这个 SQL 查询:
(
SELECT * FROM table1 AS M LEFT JOIN table2 AS D ON M.other_id = D.other_id
)
UNION
(
SELECT * FROM table1 AS M RIGHT JOIN table2 AS D ON M.other_id = D.other_id
)
结果:
id | col1 | col2 | other_id | id | col3 | other_id
------------------------------------------------------
1 | val1 | val2 | 2 | NULL | NULL | NULL
2 | val3 | val4 | 3 | NULL | NULL | NULL
NULL | NULL | NULL | NULL | 1 | val5 | 4
但我得到多个具有相同标签的列。我不想使用别名,只需加入具有相同名称的列。