1、創建兩張表

表t1:

id	name
1	a1
3	a3

表t2:?

id	name
1	b1
2	b2
5	b5

聯合查詢合并字段：?

BcmyId

a1?? ?? ?	b1?	1
0	b2	2
a3	0	3
0	b5	5

sql如下：

SELECT IFNULL(t3.name,0) as B, IFNULL(t3.name1,0) as C , COALESCE(t3.id2,t3.id1) as myId FROM ( SELECT t1.id as id2 ,t1.`name` as name,t2.id as id1 ,t2.`name` as name1 FROM t1 LEFT JOIN t2 on t1.id=t2.idUNIONSELECT t1.id as id2 ,t1.`name` as name,t2.id as id1 ,t2.`name` as name1 FROM t1 RIGHT JOIN t2 on t1.id=t2.id ) as t3 GROUP BY myId

?

?

總結

以上是生活随笔為你收集整理的mysql 全连接查询合并字段的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。