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Home Database Mysql Tutorial 使用FULL OUTER JOIN拼接多表數(shù)據(jù)

使用FULL OUTER JOIN拼接多表數(shù)據(jù)

Jun 07, 2016 pm 05:21 PM
sql server

所以這個(gè)Report直接使用INNER JOIN或者Left join/Right Join連接兩張表都得不到想要的數(shù)據(jù)。當(dāng)時(shí)Report的開發(fā)者的思路是先將符合

使用FULL OUTER JOIN拼接多表數(shù)據(jù)

[日期:2012-10-19] 來源:Linux社區(qū)? 作者:SmithLiu328 [字體:]

今天幫用戶修改一個(gè)報(bào)表,里邊設(shè)計(jì)到出庫(kù)和入庫(kù)的操作,要將每個(gè)產(chǎn)品每天的出入口信息列出來。

可能存在這樣的情況:

1.? 產(chǎn)品在出庫(kù)表中存在數(shù)據(jù)但是入庫(kù)表中沒有數(shù)據(jù)

2.? 產(chǎn)品入庫(kù)表中存在數(shù)據(jù)但是出庫(kù)表中沒有數(shù)據(jù)

所以這個(gè)Report直接使用INNER JOIN或者Left join/Right Join連接兩張表都得不到想要的數(shù)據(jù)。當(dāng)時(shí)Report的開發(fā)者的思路是先將符合條件的產(chǎn)品從出庫(kù)表和入庫(kù)表中找出來,然后使用LEFT JOIN連接入庫(kù)表和出庫(kù)表獲得最終數(shù)據(jù)。當(dāng)然這樣做沒有問題,但是不需要中間表,只需要借助FULL OUTER JOIN就可以獲得需要的數(shù)據(jù)。(FULL OUTER JOIN平時(shí)一般很少用到)

這里我們舉個(gè)例子:

QTYINT)

QTY

1,10)

2,20)

?

2,30)

3,40)

--希望得到的最終結(jié)果:

?

BON A.ID= B.ID

??

BON A.ID= B.ID

??

BON A.ID= B.ID

?

BON A.ID= B.ID

UNION

BON A.ID= B.ID

linux

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