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,'unkow
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...
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,在查询语句的其他地⽅引⽤这个⼦查询。 Oracl...
create table STUDENTS ( SID NUMBER not null, SNAME VARCHAR2(50) not null, SEX CHAR(1), BIRTHDATE DATE, EMAIL VARCHAR2(50) ) 例1:获取student表全部数据 with s as (select * from students) select * from s; 例2:获取小于平均成绩的学生学号和成绩 with c as (select avg(score) as value ...
Oracle with as (hint inline materialize) oracle性能优化文章分类Oracle数据库 测试数据: SQL>createtabletest1asselect*fromdba_objects;Tablecreated.SQL>createtabletest2asselect*fromuser_objects;Tablecreated.SQL>createtabletest3asselect*fromdba_objects;Tablecreated....
--建表create table xgj (name varchar2(20));--新增数据insert into xgj values('xiaogongjiang');--提交数据commit ;--使用for update方式获取排他行级锁select * from xgj where name='xiaogongjiang' for update ; 会话B: 在这里是在plsql中另外新开了一个窗口模拟会话B,不能在同一个会话窗口,否则测...
关于oracle with table as的用法 2015-12-02 14:40 −... suzmin 0 1757 ORACLE WITH AS 用法 2012-10-11 15:05 −语法: with tempName as (select ...)select ... 例:现在要从1-19中得到11-14。一般的sql如下: select * from( &nbs... 宽...
with 子句是在oracle 9i release 2 中引入的。with 子句又叫做子查询构造语句。可以用来给一个子查询块命名。 该查询块的检索结果会被oracle 保存在用户的临时表空间中,该命名块就像虚表或者内联视图一样。 语法 代码语言:javascript 代码运行次数:0 运行 AI代码解释 WITH subquery_name AS (the aggregation SQL ...
CREATE TABLE http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/statements_7002.htm#SQLRF01402 表空间(tableSpace) 段(segment) 盘区(extent) 块(block) 关系 一. Storage 参数说明 1. INITIAL Specify the size of the first extent of the object. Oracle allocates spac...
With AWS DMS, you can create a new table in a target database by selecting data from one or more tables in a source database using the Oracle and PostgreSQL CREATE TABLE AS SELECT statement. This statement defines a new table by querying data from existi