MERGE USING Product_Changes S INTO Products D ON (D.PROD_ID = S.PROD_ID) WHEN MATCHED THEN UPDATE SET D.PROD_LIST_PRICE =S.PROD_NEW_PRICE, D.PROD_STATUS = S.PROD_NEWSTATUSDELETE WHERE(D.PROD_STATUS = "OBSOLETE")
MERGE INTO T2 USING T1 ON (T1.NAME=T2.NAME) WHEN NOT MATCHED THEN INSERT VALUES (T1.NAME,T1.MONEY); 2.可对MERGE语句加条件 MERGE INTO T2 USING T1 ON (T1.NAME=T2.NAME) WHEN MATCHED THEN UPDATE SET T2.MONEY=T1.MONEY+T2.MONEY WHERE T1.NAME='A'; 3.可用DELETE子句清除行 /* 在...
[ merge_insert_clause ] [ error_logging_clause ] ; #merge_update_clause WHEN MATCHED THEN UPDATE SET column={ expr | DEFAULT } [, column={ expr | DEFAULT } ]... [ where_clause ] [ DELETE where_clause ] #merge_insert_clause WHEN NOT MATCHED THEN INSERT [ (column [, column ]......
MERGE USING Product_Changes S INTO Products D ON (D.PROD_ID = S.PROD_ID) WHEN MATCHED THEN UPDATE SET D.PROD_LIST_PRICE =S.PROD_NEW_PRICE, D.PROD_STATUS = S.PROD_NEWSTATUSDELETE WHERE(D.PROD_STATUS = "OBSOLETE") WHEN NOT MATCHED THEN INSERT (PROD_ID, PROD_LIST_PRICE, PROD_STATU...
不可以。not matched then 后面只能跟insert into 语句。具体语法：merge into table_name using table_view_or_query on condition when matched then update_clause delete where_clause when not matched then insert_clause
二、下面先演示一下merge的基本功能 1) matched 和not matched clauses 同时使用 merge into acct a using subs b on (a.msid=b.msid) when MATCHED then update set a.areacode=b.areacode when NOT MATCHED then insert(msid,bill_month,areacode) ...
在探讨merge操作的使用方法时，我们首先需要了解merge语句的基本语法和结构，以及其在实际应用中的几种常见用法。我们可以通过merge操作来对表中的数据进行实时更新，或者在某些条件下插入新的数据。另外，merge操作还可以有效地处理数据冲突和重复，提高了数据库操作的灵活性和效率。另外，我们还需要考虑merge操作在实际应用...
2.delete from记录是一条条删的，所删除的每行记录都会进日志，而truncate一次性删掉整个页，因此日至...
不需要连接源表和目标表 4、UPDATE子句后面可以跟DELETE子句来去除一些不需要的行 语法:MERGEHINTINTO SCHEMA .TABLE T_ALIAS USINGSCHEMA . {TABLE | VIEW |SUBQUERY } T_ALIAS ON (CONDITION)WHENMATCHEDTHEN MERGE_UPDATE_CLAUSE WHENNOTMATCHED THEN MERGE_INSERT_CLAUSE / MERGE_DELETE_CLAUSE;语法...
delete where (e.salary > 7500) --更新的同时做删除 when not matched then --当不满足on的条件时 insert (b.employee_id, b.bonus_amt) --做insert操作 values (e.employee_id, e.salary * 0.1)where (e.salary < 7500);给你一个merge的用法：merge的用法：merge就是通常用于match...