Question

我有以下问题。我有两张桌子要加入＆＃34; TableALong＆＃34;和＆＃34; TableBLong＆＃34;

TableALong

ID, Name, Store,Age
1, John, Walmart, 5
2, Johnny, Walmart, 8
3, Johnny, Target , 10
4, Bill, Shoppers, 2
5, Joe, Target, 3

TableBLong
ID, Name, Store, StoreAddress
1, John, Walmart, 35353 Address
1, John, Walmart, 53544 Address
2, Johnny, Walmart, 35353 Address

我想在加入之前做一些像ALIAS这样的事情：

SELECT A.ID, A.NAME, A.STORE, A.AGE, B.STOREADDRESS
FROM TableALong as A, TableBLong as B
ON A.NAME = B.NAME and A.STORE = B.STORE

这在oracle中无效。在oracle中使用它的正确查询是什么？我认为这是我想要的左连接？（在连接之后，TableALong中的每个项目都会有多行。）

Answer 1

固定查询：

SELECT A.ID,
       A.NAME,
       A.STORE,
       B.STOREADDRESS as yourAlias /* AS is ok for column aliases ... */
FROM TableALong A                  /* ... but not for table aliases */
     LEFT OUTER JOIN TableBLong  B /* JOIN syntax */
       ON (A.NAME = B.NAME and A.STORE = B.STORE)
WHERE ...

而不是LEFT OUTER您可以拥有INNER，FULL OUTER，...;有关详情，请参阅here。

如何在oracle中为两个表执行别名连接？

1 个答案: