我想更新一个表以指示某些行是其他行的父表,因此我在表中添加了“父代”列。以下查询查找所有 parent :
SELECT ca1.id, ca2.id
FROM contactassociations ca1
JOIN contactassociations ca2 ON (ca1.contactid = ca2.contactid)
where ca1.entitytable = 'EMPLOYER' AND
ca2.entitytable = 'CLIENT';
但是当我尝试修改该语法以进行更新时,它不起作用:
UPDATE contactassociations ca1
SET ca1.parentid = ca2.id
JOIN contactassociations ca2 ON (ca1.contactid = ca2.contactid)
WHERE ca1.entitytable = 'EMPLOYER' AND ca2.entitytable = 'CLIENT';
我得到:
Error starting at line 6 in command:
UPDATE contactassociations ca1
SET ca1.parentid = ca2.id
JOIN contactassociations ca2 ON (ca1.contactid = ca2.contactid)
WHERE ca1.entitytable = 'EMPLOYER' AND ca2.entitytable = 'CLIENT'
Error at Command Line:7 Column:28
Error report:
SQL Error: ORA-00933: SQL command not properly ended
00933. 00000 - "SQL command not properly ended"
*Cause:
*Action:
请注意,第7行第28列是“SET”行的结尾。
最佳答案
Oracle在JOIN
语句中不支持UPDATE
子句。
用这个:
MERGE
INTO contactassociations ca1
USING contactassociations ca2
ON (
ca1.contactid = ca2.contactid
AND ca1.entitytable = 'EMPLOYER'
AND ca2.entitytable = 'CLIENT'
)
WHEN MATCHED THEN
UPDATE
SET parentid = ca2.id
关于sql - 通过 self 加入进行更新,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2380353/