在Oracle上使用内连接更新语句
我有一个查询在MySQL中正常工作,但是当我在Oracle上运行它时,出现以下错误:
SQL错误:ORA-00933:SQL命令未正确结束
00933. 00000 - “SQL命令未正确结束”
该查询是:
UPDATE table1
INNER JOIN table2 ON table1.value = table2.DESC
SET table1.value = table2.CODE
WHERE table1.UPDATETYPE='blah';
该语法在Oracle中无效。 你可以这样做:
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);
或者你可以这样做:
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
(这取决于内联视图是否被Oracle视为可更新的)。
Oracle
不支持UPDATE
语句中的连接。
用这个:
MERGE
INTO table1 trg
USING (
SELECT t1.rowid AS rid, t2.code
FROM table1 t1
JOIN table2 t2
ON table1.value = table2.DESC
WHERE table1.UPDATETYPE='blah'
) src
ON (trg.rowid = src.rid)
WHEN MATCHED THEN UPDATE
SET trg.value = code;
合并where子句为我工作:
merge into table1
using table2
on (table1.id = table2.id)
when matched then update set table1.startdate = table2.start_date
where table1.startdate > table2.start_date;
您需要WHERE
子句,因为ON
子句中引用的列无法更新。