CREATE TABLE w_test_20 AS WITH data_info_19 AS (SELECT NVL(ename,'unknow employee') AS ename, DECODE(deptno,10,'ACCOUNTING',20,'RESEARCH',30,'SALES',40,'OPERATIONS','no this department') AS dname, NVL(job,'unkown job') AS job , substr(to_char(hiredate,'yyyy-mm-dd'),1,7) A...
向一张表插入数据的with as 用法: insertintotable2withs1as (select rownum c1from dual connectby rownum<=10), s2as (select rownum c2from dual connectby rownum<=10)select a.c1, b.c2from s1 a, s2 bwhere...; with as 相当于虚拟视图。 with as短语,也叫做子查询部分(subquery factoring),可以...
CREATETABLEw_test_18ASWITHdept_infoAS(SELECTdeptnoASdeptno_1,dnameFROMdept) , emp_infoAS(SELECTempnoASempno_1,ename,job,deptnoFROMemp) , other_infoAS(SELECTempno,hiredate,NVL(sal,0)+NVL(comm,0)AStotal_salFROMemp )SELECT*FROMdept_info dLEFTJOINemp_info eONd.deptno_1=e.deptnoRIGHTJOINoth...
在视图中使⽤WITH语句进⾏连接: CREATEORREPLACEVIEWV_EMP_DETAILAS WITHW_DEPTAS( SELECT*FROMDEPT ), W_EMPAS( SELECT*FROMEMP ) SELECTd.dept_name, e.* FROMW_EMP e LEFTJOINW_DEPT dONd.dept_no=e.dept_no; 总结: 使⽤WITH AS 语句可以为⼀个⼦查询语句块定义⼀个名称,在查询语句的...
⽤with的⽤法：insert into HW_RATE (ID,SUB_TYPE,DISTRICT_CODE,REGION_CODE,SUB_AREA_CODE,CREATE_DATE,CREATE_USER)with areaInfo as (select o.district_code bu, o.region_code re from eis_user.org_office o where o.sub_area_code ='60487'and o.status =1 and o.year= extract(year from...
SQL> insert into t3 values(3); 1 row created. SQL> commit; Commit complete. SQL> select * from t2; ID --- 1 2 SQL> select * from t3; ID --- 3 SQL> with 2 sql1 as (select * from t2), 3 sql2 as (select * from t3) 4 select * from t2 ...
Oracle在执行INSERT语句时,可以通过指定NOLOGGING关键字来减少日志记录,提升操作性能。PostgreSQL不支持此关键字。 AS关键字 INSERT INTO 后面不需要添加as关键字,insert into ... as select... 修改为insert into... select... FROM子查询的别名 Oracle中在不引起歧义的情况下子查询可以不带别名,而在PostgreSQL中...
Oracle在执行INSERT语句时,可以通过指定NOLOGGING关键字来减少日志记录,提升操作性能。Opengauss不支持此关键字。 编号OracleOpengauss 1 insert into customer nologging select * from customer_bk; insert into customer select * from customer_bk; AS关键字 INSERT INTO 后面不需要添加as关键字,insert into ... as...
insert into tb_user1 values (1, 'user11'); insert into tb_user1 values (2, 'user12'); insert into tb_user1 values (3, 'user13'); commit; 1. 2. 3. 4. 5. 6. 7. create table table_name as select from SQL> create table tb_user2 as select * from tb_user1; ...
其实就是把一大堆重复用到的sql语句放在with as里面,取一个别名,后面的查询就可以用它,这样对于大批量的sql语句起到一个优化的作用,而且清楚明了。 向一张表插入数据的with as 用法: insert into table2withs1as(select rownum c1 from dual connect by rownum<=10),s2as(select rownum c2 from dual connec...