oracle 更新语句 插入语句
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这个oracle 要怎么写
update device d,js_shop_pos sp,js_to_be_maintenance m SET d.client_no=sp.client_id,d.contract_no=sp.contract_id
where AND d.dev_no = m.pos_dev_no and sp.pos_code=m.pos_code and d.client_no is null or d.contract_no is null and d.dev_status=27
----------------------------问题具体描述 ↓↓↓ -------------------------------------------
select A.id,A.age,A.sex,B.no,B.no1,C.age,C.sex
from B
left join A on A.id = B.no1
left join C on C.no = B.no
现在要把C表的 age sex 插入到A表去 C表和A表无直接对应关系
http://tieba.baidu.com/p/4428985282?pid=86143080464&cid=0#86143080464
不对
Oracle MERGE语句
MERGE语句,它可以在一个SQL语句中对一张表或一个视图同时做更新或插入操作,避免了多个INSERT、UPDATE和DELETE语句。它可以从一个或多个数据源中选择数据对目标表做更新或插入操作,你可以指定在何种条件下更新或插入目标表或视图。不可以对同一行做多次更新操作。例如:实现用B表来更新A表数据,如果A表中没有,则把B表的数据插入A表。
11gR2语法如下:
MERGE [ hint ] INTO [ schema. ] { table | view } [ t_alias ] USING { [ schema. ] { table | view } | subquery } [ t_alias ] ON ( condition ) [ merge_update_clause ] [ 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 ]...) ] VALUES ({ expr | DEFAULT } [, { expr | DEFAULT } ]... ) [ where_clause ] #error_logging_clause LOG ERRORS [ INTO [schema.] table ] [ (simple_expression) ] [ REJECT LIMIT { integer | UNLIMITED } ]
使用例子说明MERGE语句的作用:
创建测试表emp_m
[email protected]>create table emp_m as select * from emp where comm is not null; Table created. [email protected]>select * from emp_m; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO ---------- ------------------------------ --------------------------- ---------- ------------------- ---------- ---------- ---------- 7499 ALLEN SALESMAN 7698 1981-02-20 00:00:00 1600 300 30 7521 WARD SALESMAN 7698 1981-02-22 00:00:00 1250 500 30 7654 MARTIN SALESMAN 7698 1981-09-28 00:00:00 1250 1400 30 7844 TURNER SALESMAN 7698 1981-09-08 00:00:00 1500 0 30
例子1:插入和更新操作
现在测试表emp_m中只有comm不为空的数据,现在要把在emp表而不在emp_m表中的数据插入到emp_m表中,并把emp_m表中现有的数据的comm增加10。
[email protected]>MERGE INTO EMP_M M 2 USING EMP N 3 ON (M.EMPNO = N.EMPNO) 4 WHEN NOT MATCHED THEN 5 INSERT 6 (M.EMPNO, M.ENAME, M.JOB, M.MGR, M.HIREDATE, M.SAL, M.COMM, M.DEPTNO) 7 VALUES 8 (N.EMPNO, N.ENAME, N.JOB, N.MGR, N.HIREDATE, N.SAL, N.COMM, N.DEPTNO) 9 WHEN MATCHED THEN 10 UPDATE SET M.COMM = M.COMM + 10; 14 rows merged. [email protected]>select * from emp_m; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO ---------- ------------------------------ --------------------------- ---------- ------------------- ---------- ---------- ---------- 7499 ALLEN SALESMAN 7698 1981-02-20 00:00:00 1600 310 30 7521 WARD SALESMAN 7698 1981-02-22 00:00:00 1250 510 30 7654 MARTIN SALESMAN 7698 1981-09-28 00:00:00 1250 1410 30 7844 TURNER SALESMAN 7698 1981-09-08 00:00:00 1500 10 30 7369 SMITH CLERK 7902 1980-12-17 00:00:00 800 20 7566 JONES MANAGER 7839 1981-04-02 00:00:00 2975 20 7698 BLAKE MANAGER 7839 1981-05-01 00:00:00 2850 30 7782 CLARK MANAGER 7839 1981-06-09 00:00:00 2450 10 7788 SCOTT ANALYST 7566 1987-04-19 00:00:00 3000 20 7839 KING PRESIDENT 1981-11-17 00:00:00 5000 10 7876 ADAMS CLERK 7788 1987-05-23 00:00:00 1100 20 7900 JAMES CLERK 7698 1981-12-03 00:00:00 950 30 7902 FORD ANALYST 7566 1981-12-03 00:00:00 3000 20 7934 MILLER CLERK 7782 1982-01-23 00:00:00 1300 10 14 rows selected.
例子2:实现删除操作
从emp_m表中删除表emp中DEPTNO=30的记录。
[email protected]>MERGE INTO EMP_M M 2 USING (SELECT EMPNO FROM EMP WHERE DEPTNO = 30) N 3 ON (M.EMPNO = N.EMPNO) 4 WHEN MATCHED THEN 5 UPDATE SET M.COMM = DEFAULT 6 DELETE WHERE M.EMPNO = N.EMPNO; 6 rows merged. [email protected]>select * from emp_m; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO ---------- ------------------------------ --------------------------- ---------- ------------------- ---------- ---------- ---------- 7369 SMITH CLERK 7902 1980-12-17 00:00:00 800 20 7566 JONES MANAGER 7839 1981-04-02 00:00:00 2975 20 7782 CLARK MANAGER 7839 1981-06-09 00:00:00 2450 10 7788 SCOTT ANALYST 7566 1987-04-19 00:00:00 3000 20 7839 KING PRESIDENT 1981-11-17 00:00:00 5000 10 7876 ADAMS CLERK 7788 1987-05-23 00:00:00 1100 20 7902 FORD ANALYST 7566 1981-12-03 00:00:00 3000 20 7934 MILLER CLERK 7782 1982-01-23 00:00:00 1300 10
使用注意事项:
不能指定一个在它上面定义了INSTEAD OF触发器的视图为目标视图。
USING子名指定源数据,可以是表、视图或子查询
UPDATE子句中的where条件可以指定目标表的条件也可以指定源表的条件
UPDATE子句中不能更新ON条件中的列,更新表时不能指定DEFAULT
UPDATE子句中指定DELETE WHERE用于删除数据。
INSERT子句中,如果INSERT后省略列名,VALUES后的列的个数必须与目标表列个数一致
INSERT子句中,可以使用WHERE条件限制插入的数据
官方文档:http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_9016.htm#SQLRF01606
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