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col tname for a20; 基本的select ... from table_name查询 查询表结构 desc emp; 复制emp的结构和数据到新表中new_emp create table new_emp as select * from emp; #查询拷贝的新表 select * from new_emp; 查询emp表的所有内容 selec * from emp; 查询emp表的不重复工作 selectdistinctjob from emp...
CONNECT SCOTT/tigerCREATETABLEDEPT (DEPTNONUMBER(2)CONSTRAINTPK_DEPTPRIMARYKEY, DNAMEVARCHAR2(14) , LOCVARCHAR2(13) ) ;CREATETABLEEMP (EMPNONUMBER(4)CONSTRAINTPK_EMPPRIMARYKEY, ENAMEVARCHAR2(10), JOBVARCHAR2(9), MGRNUMBER(4), HIREDATE DATE, SALNUMBER(7,2), COMMNUMBER(7,2), DEPTNONUMBER...
TABLESPACE "EXAMPLE" ENABLE;ALTERTABLE"HR"."EMPLOYEES" MODIFY ("HIRE_DATE"CONSTRAINT"EMP_HIRE_DATE_NN"NOTNULLENABLE);ALTERTABLE"HR"."EMPLOYEES" MODIFY ("JOB_ID"CONSTRAINT"EMP_JOB_NN"NOTNULLENABLE);ALTERTABLE"HR"."EMPLOYEES" MODIFY ("LAST_NAME"CONSTRAINT"EMP_LAST_NAME_NN"NOTNULLENABLE);ALTE...
scott/your_password@your_service_name 是你的Oracle数据库连接字符串,包括用户名、密码和服务名。 schemas=scott 指定了要导出的模式(用户)为scott。 include=TABLE:"IN ('EMP', 'SALGRADE')" 限定只导出emp和salgrade表。 directory=DATA_PUMP_DIR 指定了Oracle目录对象,该对象指向导出文件将存储的目录。你需要...
CREATE TABLE s_image (id NUMBER(7) CONSTRAINT s_image_id_nn NOT NULL, format VARCHAR2(25), use_filename VARCHAR2(1), filename VARCHAR2(255), image LONG RAW, CONSTRAINT s_image_id_pk PRIMARY KEY (id), CONSTRAINT s_image_format_ck CHECK (format in ('JFIFF', 'JTIFF')), CONSTRAI...
ContributorMike Hichwa (Oracle) CreatedMonday October 05, 2015 Statement1 Create DEPT table which will be the parent table of the EMP table. createtabledept( deptnonumber(2,0), dname varchar2(14), loc varchar2(13),constraintpk_deptprimarykey(deptno) ) ...
1oracle变量表类型declaretype my_emp is table of scott.emp%rowtypeindex by binary_integer;new_emp my_emp;v_num number:=0;cursor cur_emp is select empno,ename,job,sal from scott.emp;--1.cursor 是个什么东东?beginfor v_emp in cur_emp loop --2.v_emp是个什么东东?怎么和正常for语句不一...
CREATE TABLE "emp" ("empno" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "ename" varchar(30) NOT NULL, "job" varchar(30) NOT NULL, "mgr" integer NOT NULL , "hiredate" datetime NOT NULL, "sal" integer NOT NULL, "deptno_id" integer NOT NULL REFERENCES "dept" ("deptno")); ...
12、TO SALGRADE VALUES (5,3001,9999);COMMIT;EXIT- 把Oracle自带的练习用表的建表语句中的NUMBER改为INT,VARCHAR2改为VARCHAR,to_date()函数直接去掉,设置主键和关联外键的语法修改一下,就是MySQL的建表语句: -CREATE DATABASE OracleDEFAULT CHARACTER SET UTF8;USE Oracle;CREATE TABLE DEPT(DEPTNO INT(2)...