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[英]How do I always pull data from one table, but also pull data from a second table if it's there in MySQL?
[英]How to only pull data from table 1 if table 2 also have data
我的問題是,我有兩個用於運輸的表,而這就是正在發生的情況。 如果ca.addr_1有數據可以,但是c.addr_2中有數據,則顯示它。 我想要的是如果ca.addr在某行上有數據,請使用它,但如果所有行均為空,則使用c.addr。
CO.SHIP_TO_ADDR_NO AS Addr_No,
ISNULL(CA.NAME, C.NAME) AS Name,
ISNULL(CA.ADDR_1, C.ADDR_1) AS Addr_1,
ISNULL(CA.ADDR_2, C.ADDR_2) AS Addr_2,
ISNULL(CA.ADDR_3, C.ADDR_3) AS Addr_3,
ISNULL(CA.CITY, C.CITY) AS City,
ISNULL(CA.STATE, C.STATE) AS State,
ISNULL(CA.ZIPCODE, C.ZIPCODE) AS ZipCode,
ISNULL(CA.COUNTRY, C.COUNTRY) AS Country,
CASE WHEN應該允許您做您需要的事情。
CASE WHEN ca.addr1 IS NULL AND CA.ADDR_2 IS NULL AND CA.ADDR_3 IS NULL
THEN c.addr
ELSE WHEN ....
您可以使用ELSE WHEN來添加盡可能多的變體,以考慮要選擇的地址結果的任何排列。
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