亚洲精品久久久久久第一页-人妻少妇精彩视品一区二区三区-91国产自拍免费视频-免费一级a在线播放视频正片-少妇天天日天天射天天爽-国产大屁股喷水视频在线观看-操美女骚穴抽插性爱视频-亚洲 欧美 中文字幕 丝袜-成人免费无码片在线观看

  1. 首頁 > 生活知識 > >

oracle更新字段的數(shù)據(jù)了解 oracle更新多個字段的數(shù)據(jù)

生活百科oracle


oracle更新字段的數(shù)據(jù)了解 oracle更新多個字段的數(shù)據(jù)

文章插圖
概述今天主要介紹一下Oracle數(shù)據(jù)庫中多表關聯(lián)批量插入、多表關聯(lián)批量更新和多表關聯(lián)批量刪除 。下面用實驗來理解下~
一、創(chuàng)建必須的表和序列語句--創(chuàng)建部門表 dept:CREATE TABLE dept( deptno NUMBER(2) CONSTRAINT PK_DEPT PRIMARY KEY, dname VARCHAR2(14) , loc VARCHAR2(13) ,CREATEDTIME DATE,UPDATEDTIME DATE,CREATEDBY NUMBER(7,0),UPDATEDBY NUMBER(7,0)) ; --創(chuàng)建員工表 emp:CREATE TABLE emp(empno NUMBER(4) CONSTRAINT PK_EMP PRIMARY KEY,ename VARCHAR2(10),job VARCHAR2(15),mgr NUMBER(4),hiredate DATE,sal NUMBER(7,2),comm NUMBER(7,2),deptno NUMBER(2) CONSTRAINT FK_DEPTNO REFERENCES DEPT,CREATEDTIME DATE,UPDATEDTIME DATE,CREATEDBY NUMBER(7,0),UPDATEDBY NUMBER(7,0)); --創(chuàng)建員工表 emp_copy:CREATE TABLE emp_copy(empno NUMBER(4),ename VARCHAR2(10),job VARCHAR2(15),mgr NUMBER(4),hiredate DATE,sal NUMBER(7,2),comm NUMBER(7,2),deptno NUMBER(2),CREATEDTIME DATE,UPDATEDTIME DATE,CREATEDBY NUMBER(7,0),UPDATEDBY NUMBER(7,0) );--自定義一個序列create sequence emp_sequenceincrement by 1 --每次增加幾個，我這里是每次增加1start with 1--從1開始計數(shù)nomaxvalue--不設置最大值nocycle--一直累加，不循環(huán)nocache--不建緩沖區(qū);--插入dept表數(shù)據(jù):INSERT INTO dept VALUES(10,'ACCOUNTING','NEW YORK',sysdate,sysdate,123123,123123);INSERT INTO dept VALUES (20,'RESEARCH','DALLAS',sysdate,sysdate,123123,123123);INSERT INTO dept VALUES(30,'SALES','CHICAGO',SYSDATE,SYSDATE,123123,123123);INSERT INTO dept VALUES(40,'OPERATIONS','BOSTON',sysdate,sysdate,123123,123123); --插入emp表數(shù)據(jù):INSERT INTO emp VALUES(7369,'SMITH','CLERK',7902,to_date('17-12-1980','dd-mm-yyyy'),800,NULL,20,sysdate,sysdate,123123,123123);INSERT INTO emp VALUES(7499,'ALLEN','SALESMAN',7698,to_date('20-2-1981','dd-mm-yyyy'),1600,300,30,sysdate,sysdate,123123,123123);INSERT INTO emp VALUES(7521,'WARD','SALESMAN',7698,to_date('22-2-1981','dd-mm-yyyy'),1250,500,30,SYSDATE,SYSDATE,123123,123123);INSERT INTO emp VALUES(7566,'JONES','MANAGER',7839,to_date('2-4-1981','dd-mm-yyyy'),2975,NULL,20,sysdate,sysdate,123123,123123);INSERT INTO emp VALUES(7654,'MARTIN','SALESMAN',7698,to_date('28-9-1981','dd-mm-yyyy'),1250,1400,30,SYSDATE,SYSDATE,123123,123123);INSERT INTO emp VALUES(7698,'BLAKE','MANAGER',7839,to_date('1-5-1981','dd-mm-yyyy'),2850,NULL,30,sysdate,sysdate,123123,123123);INSERT INTO emp VALUES(7782,'CLARK','MANAGER',7839,to_date('9-6-1981','dd-mm-yyyy'),2450,NULL,10,SYSDATE,SYSDATE,123123,123123);INSERT INTO emp VALUES(7788,'SCOTT','ANALYST',7566,to_date('19-4-87','dd-mm-yyyy'),3000,NULL,20,SYSDATE,SYSDATE,123123,123123);INSERT INTO emp VALUES(7839,'KING','PRESIDENT',NULL,to_date('17-11-1981','dd-mm-yyyy'),5000,NULL,10,sysdate,sysdate,123123,123123);INSERT INTO emp VALUES(7844,'TURNER','SALESMAN',7698,to_date('8-9-1981','dd-mm-yyyy'),1500,0,30,SYSDATE,SYSDATE,123123,123123);INSERT INTO emp VALUES(7876,'ADAMS','CLERK',7788,to_date('23-5-87','dd-mm-yyyy'),1100,NULL,20,sysdate,sysdate,123123,123123);INSERT INTO emp VALUES(7900,'JAMES','CLERK',7698,to_date('3-12-1981','dd-mm-yyyy'),950,NULL,30,sysdate,sysdate,123123,123123);INSERT INTO emp VALUES(7902,'FORD','ANALYST',7566,to_date('3-12-1981','dd-mm-yyyy'),3000,NULL,20,SYSDATE,SYSDATE,123123,123123);INSERT INTO emp VALUES(7934,'MILLER','CLERK',7782,to_date('23-1-1982','dd-mm-yyyy'),1300,NULL,10,sysdate,sysdate,123123,123123);二、多表關聯(lián)批量插入要求:批量復制部門dept表 loc在 CHICAGO的,且工資大于1600的人員信息到emp_copy表,emp_copy的empno需要使用序列emp_sequence
INSERT INTO emp_copy SELECT emp_sequence.nextVal,C.* FROM (SELECTe.ename, e.JOB, e.mgr, e.hiredate, e.sal,e.comm,e.deptno,SYSDATE AS CREATEDTIME,SYSDATE AS UPDATEDTIME,123124 AS CREATEDBY,123124 as UPDATEDBYFROM emp e, dept dWHERE e.deptno = d.deptnoAND d.loc='CHICAGO'and e.sal>=1500 )C;其中emp_sequence.nextVal保證了C.*的多條數(shù)據(jù)都能取到不同的序列值


以上關于本文的內(nèi)容，僅作參考！溫馨提示：如遇健康、疾病相關的問題，請您及時就醫(yī)或請專業(yè)人士給予相關指導!

「愛刨根生活網(wǎng)」www.malaban59.cn小編還為您精選了以下內(nèi)容，希望對您有所幫助：