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[英]SQL query map values in multiple columns to different value in another table
[英]Query to map value of a column in another table in sql
我有一个表emp
和bu_source
。 现在emp
表是这样的
mail_id first_name pos bu_name
sreekom@abc.xom sreekom abc land_bu
sreekom@abc.xom sreekom abc land_bu
simth @thought.com smith xyz MEZC
bu_source
该表对bu_name进行分组。 例如,land_bu,aev_bu将归入电力公司,BEZC和MEZC将归入股权投资。 所以表的结构是这样的:
source_bu_name result_bu_name
land_bu power corporation
aev_bu power corporation
BEZC Equity ventures
MEZC Equity ventures
我想要一个查询结果如下:
mail_id first_name pos bu_name result_bu_name
sreekom@abc.xom sreekom abc land_bu power corporation
simth @thought.com smith xyz MEZC Equity ventures
我创建了一个查询
SELECT
mail_id ,
First_Name ,
pos ,
Source_Bu_Name , -- bu name
result_bu_name
From Emp
left join bu_source on Emp.BU_NAME = bu_source.SOURCE_BU_NAME;
但是,尽管该表具有值,但是bu_name的空白列很少。
您需要将其更改为
SELECT
e.mail_id
,e.first_name
,e.pos
,e.bu_name --bs.source_bu_name
,bs.result_bu_name
FROM
Emp e
LEFT JOIN
bu_source bs
ON
e.bu_name = bs.source_bu_name;
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