PRIMARYKEY(UserId), CONSTRAINTUQ_JNUser_IdNumberUNIQUE(IdNumber), CONSTRAINTCK_JNUser_SexCHECK(Sex >=0ANDSex <=2) ); CREATETABLEJNOrder ( OrderIdNUMBER(10)NOTNULL, UserIdNUMBER(10)NOTNULL, OrderNoVARCHAR2(16)NOTNULL, TotalAmountFLOATNOTNULL, OrderDateDATENOTNULL, RemarksVARCHAR2(4000), ...
--1.创建测试表 createTABLETable1(avarchar(10),bvarchar(10),cvarchar(10),CONSTRAINT[PK_Table1]PRIMARYKEYCLUSTERED(aASC))ON[PRIMARY]GO--2.创建测试数据 Insert into Table1values('赵','asds','90')Insert into Table1values('钱','asds','100')Insert into Table1values('孙','asds','80')I...
Log errors with the Oracle error_logging_clause. ALTER TABLE EMPS ADD CONSTRAINT PK_EMP_ID PRIMARY KEY(employee_id); EXECUTE DBMS_ERRLOG.CREATE_ERROR_LOG('EMPS', 'ERRLOG'); INSERT INTO EMPS SELECT EMPLOYEE_ID, FIRST_NAME, SALARY, DEPARTMENT_ID FROM EMPLOYEES WHERE SALARY ...
CONSTRAINT constraint CHECK OPTION制約の名前を指定します。この識別子を省略した場合は、Oracleによって自動的にSYS_Cnという形式の制約名が割り当てられます(nはデータベース内で制約名を一意にするための整数)。 関連項目: 「WITH CHECK OPTION句の使用例:」 table_collection_expression table_collect...
主键(constraint) 外键 (constraint) 用户自定义完整性约束 (check) 代码语言:sql AI代码解释 create table t_emp(empno int not null primary key, ename varchar(20), esex char(2)); /* 创建时设置主键*/ create table t_emp(empno int, ename varchar(20), esex char(2), primary key (empno)...
Select * from emp where empno In(7521,7900,7876); --In(某个集合) select * from emp where ENAME Like '%A%N%'; --模糊查询,名字中有A和N的,A在N之前 select * from emp where ENAME Like '__M%'; --两跳,第三个字母是M的。
CONSTRAINT contacts_pk PRIMARY KEY (contact_id) ); Solution for Practice Exercise #1: The following Oracle SELECT statement would select these records from theemployeestable: SELECT * FROM contacts WHERE last_name = 'Smith' AND contact_id >= 1000 ...
CREATE TABLE emp ( empno NUMBER(4) NOT NULL CONSTRAINT emp_pk PRIMARY KEY, ename VARCHAR2(10), job VARCHAR2(9), mgr NUMBER(4), hiredate DATE, sal NUMBER(7,2) CONSTRAINT emp_sal_ck CHECK (sal > 0), comm NUMBER(7,2), deptno NUMBER(2) ); INSERT INTO emp VALUES (7369,'SMITH'...
sys.link$ union select 'CONSTRAINT' , count(*) from sys.con$ 有关connection的相关信息 1)查看有哪些用户连接 select s.osuser os_user_name, decode(sign(48 - command), 1, to_char(command), 'Action Code #' || to_char(command) ) action, p.program oracle_process, ...
CONSTRAINTCK_JNUser_SexCHECK(Sex >=0ANDSex <=2) ); CREATETABLEJNOrder ( OrderIdNUMBER(10)NOTNULL, UserIdNUMBER(10)NOTNULL, OrderNoVARCHAR2(16)NOTNULL, TotalAmountFLOATNOTNULL, OrderDateDATENOTNULL, RemarksVARCHAR2(4000) , PRIMARYKEY(OrderId), ...