在Oracle上使用内部联接更新语句 [英] Update statement with inner join on Oracle

问题描述

我有一个在MySQL中运行良好的查询，但是当我在Oracle上运行它时，出现以下错误:

I have a query which works fine in MySQL, but when I run it on Oracle I get the following error:

SQL错误:ORA-00933:SQL命令未正确结束
00933. 00000-"SQL命令未正确结束"

SQL Error: ORA-00933: SQL command not properly ended
00933. 00000 - "SQL command not properly ended"

查询是:

UPDATE table1
INNER JOIN table2 ON table1.value = table2.DESC
SET table1.value = table2.CODE
WHERE table1.UPDATETYPE='blah';

推荐答案

该语法在Oracle中无效.您可以这样做:

That syntax isn't valid in Oracle. You can do this:

UPDATE table1 SET table1.value = (SELECT table2.CODE
                                  FROM table2 
                                  WHERE table1.value = table2.DESC)
WHERE table1.UPDATETYPE='blah'
AND EXISTS (SELECT table2.CODE
            FROM table2 
            WHERE table1.value = table2.DESC);

或者您可能能够做到这一点:

Or you might be able to do this:

UPDATE 
(SELECT table1.value as OLD, table2.CODE as NEW
 FROM table1
 INNER JOIN table2
 ON table1.value = table2.DESC
 WHERE table1.UPDATETYPE='blah'
) t
SET t.OLD = t.NEW

取决于内联视图是否被Oracle认为是可更新的 (要更新第二条语句取决于列出的一些规则 此处 ).

It depends if the inline view is considered updateable by Oracle ( To be updatable for the second statement depends on some rules listed here ).

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