[英]Join 2 tables in SQL Server
I have 2 tables as following: 我有2张桌子,如下所示:
Table_1 表格1
CODE1 CODE2 CODE3 SYNC
-----------------------------------
02 03 04 YES
01 03 NULL NO
01 02 03 NA
Table_2 表_2
CODE NAME
--------------
01 ABC
02 BCD
03 DEF
04 EFG
How to create the query as the following result: 如何将查询创建为以下结果:
CODE1 CODE2 CODE3 SYNC
--------------------------------------
BCD DEF EFG YES
ABC DEF NULL NO
ABC BCD DEF NA
This is what you need to do 这就是你要做的
SELECT T2.CODE AS [CODE1],T3.CODE AS [CODE2],T4.CODE AS [CODE3],T.SYNC
FROM Table_1 T
LEFT JOIN Table_2 T2 ON T2.CODE = T.CODE1
LEFT JOIN Table_2 T3 ON T3.CODE = T.CODE2
LEFT JOIN Table_2 T4 ON T4.CODE = T.CODE3
Try using left join
: 尝试使用
left join
:
SELECT
tblCODE1.NAME AS CODE1,
tblCODE2.NAME AS CODE2,
tblCODE3.NAME AS CODE3,
Table_1.SYNC
FROM
Table_1
LEFT JOIN Table_2 as tblCODE1
ON tblCODE1.CODE=Table_1.CODE1
LEFT JOIN Table_2 as tblCODE2
ON tblCODE2.CODE=Table_1.CODE2
LEFT JOIN Table_2 as tblCODE3
ON tblCODE3.CODE=Table_1.CODE3
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