在这个应用场景中,MERGE INTO语句与SELECT子句结合使用,确保了新用户信息的准确合并,避免了重复插入和数据不一致的问题。
commit; insertinto B_MERGEvalues(1,2,'zhangbin',30,'吉林'); insertinto B_MERGEvalues(2,4,'yihe',33,'黑龙江'); insertinto B_MERGEvalues(3,3,'fuguo','','山东'); commit; 4:MERGE INTO A_MERGE A USING (select B.AID,B.NAME,B.YEAR from B_MERGE B) C ON (A.id=C.AID) WHEN...
(1)使用merge into用b_merge表中的数据来更新a_merge表中的数据 mergeintoa_merge a using (selectb.aid, b.name, b.yearfromb_merge b) con(a.id=c.aid)whenmatchedthenupdateseta.year=c.yearwhennotmatchedtheninsert(a.id, a.name, a.year)values(c.aid, c.name, c.year);commit; 执行上述语...
MERGEINTOemployees eUSING(SELECTemployee_id, first_name, last_name, salaryFROMnew_employeesWHEREdepartment_id=10) neON(e.employee_id=ne.employee_id)WHENMATCHEDTHENUPDATESETe.salary=ne.salaryWHENNOTMATCHEDTHENINSERT(employee_id, first_name, last_name, salary)VALUES(ne.employee_id, ne.first_name, ...
2.关于Merge 中delete的用法: delete没有不匹配的时候,直接跟在update后面,添加delete where+条件 Merge into (select * from student_mid) t1 using (select * from student_message) t2 on ( = ) WHEN MATCHED THEN Update set = ,t1.adress = t2.adress ...
章我们介绍了Oracle的临时表的使用方法《Oracle的临时表的使用》,就像我前面说的,多表关联查询的时候会用到临时表插入数据,然后再用select查行查询,在往临时表里插入数据的时候,我们经常会用到判断如果临时表里有了这部分数据我们就要更新数据,如果临时表里没有这部分数据我们就要插入,这个时候就到用了Merge into...
INSERT INTO TEST_111111 VALUES (1,'小红'); 上面这条语句执行两次,插入两条相同的记录 INSERT INTO TEST_222222 SELECT * FROM TEST_111111 WHERE ID = 1; MERGE INTO TEST_111111 T1 USING TEST_222222 T2 ON (T1.NAME = T2.NAME ) WHEN MATCHED THEN UPDATE SET T1.ID = 521 WHEN NOT MATCHED ...
一、MERGE INTO语句 1、merge into语句的功能:我们操作数据库的时候,有时候会遇到insert或者Update这种需求。我们操纵代码时至少需要写一个插入语句和更新语句并且还得单独写方法效验数据是否存在,这种操作完全可以用merge into语句代替,不仅省时省力而且条理更清晰,一个SQL语句直接完成插入,如果有相同主键进行更新操作。
merge into fares t using (select DEPART, ARRIVE, price from my_table) tmp on (t.depart = tmp.depart and t.arrive = tmp.arrive) when matched then update set t.price = tmp.price when not matched then insert values (tmp.depart, tmp.arrive, tmp.price) ...
mergeintoZ_TABLE t1using(selectS_SYSTEM_ID, S_PORT_ID,S_SYSTEM_NAMEfromZ_TABLE minusselectS_SYSTEM_ID, S_PORT_ID,S_SYSTEM_NAMEfromL_TABLE ) t2on( t1.S_PORT_ID=t2.S_PORT_IDandt1.S_SYSTEM_ID=t2.S_SYSTEM_IDandnvl(t1.S_SYSTEM_NAME,'1')=nvl(t2.S_SYSTEM_NAME,'1') ...