sql>select constraint_name,constraint_type,status,validated from user_constraints where table_name='Goods'; B、显示列约束 通过查询数据字典视图user_cons_column,可以显示约束所对应的表列信息。 sql>select column_name,position from user_cons_columns where constraint_name='CK_Address'; 6、表级定义和列...
CONSTRAINT_NAME|CONSTRAINT_TYPE|SEARCH_CONDITION|---+---+---+EMP_LAST_NAME_NN|C|"LAST_NAME"ISNOTNULL|EMP_EMAIL_NN|C|"EMAIL"ISNOTNULL|EMP_HIRE_DATE_NN|C|"HIRE_DATE"ISNOTNULL|EMP_JOB_NN|C|"JOB_ID"ISNOTNULL|EMP_SALARY_MIN|C|salary>0|EMP_EMAIL_UK|U||EMP_EMP_ID_PK|P||EMP_...
2. **查询特定表的约束**: ```sql SELECT CONSTRAINT_NAME, CONSTRAINT_TYPE, SEARCH_CONDITION, R_CONSTRAINT_NAME... oracle优化笔记 select c.constraint_name, c.constraint_type, cc.column_name from user_constraints c, user_cons_columns cc where c.owner = upper('&table_owner') and c.table...
格式:DISABLE|ENABLE CONSTRAINT constraint_name 先从user_constraints数据字典中查找约束的名称、类型和状态 SQL> select constraint_name,constraint_type,status from user_constraints Where table name='USERINFO_CH3'; -> CONSTRAINT_NAME C STATUS --- - --- SYS_CXXXXXXX U ENABLED CK_SALARY_NEW C ENABLED...
(userid); --删除主键 alter table 表名 drop constraint 主键名 --查看当前数据库所有用户 select * from dba_users --添加外键 alter table 表2 add constraint 外键名 foreign key(表2中需要建外键的字段) references 表1 --删除外键 alter table test2 drop constraint fk_test2 --查询某个时间点的数据...
SQL> col constraint_name for a11 SQL> select CONSTRAINT_NAME ,CONSTRAINT_TYPE,TABLE_NAME ,STATUS,DEFERRABLE,DEFERRED,validated from u ser_constraints where table_name='AA'; CONSTRAINT_ C TABLE STATUSDEFERRABLEDEFERRED VALIDATED --- - --- --- --- --- --- PKP AAENABLED NOT DEFERRABLE IMMED...
create table person( pid number(10), name varchar2(10), gender number(1) default 1, birthday date, constraint person_pk_pid primary key(pid)); 非空约束 使用非空约束,可以使指定的字段不可以为空。 示例:建立一张pid和name不可以为空的表 ...
CONSTRAINT_NAME : SYS_C007445 CONSTRAINT_TYPE : C SEARCH_CONDITION : "C1" IS NOT NULL --- PL/SQL procedure successfully completed. 1. 2. 3. 4. 5. 6. 7. 8. 因此,答案显而易见了。 但是,为什么是这现象?我们从Oracle官方手册,能看到一些端倪,《SQL Language Reference》谈到了CTAS对于约束的...
EXCLUDE=CONSTRAINTEXCLUDE=INDEX 如果导入时遇到如下错误,就需要调整REMAP_SCHEMA参数: ORA-39146: schema "SMS_MT" does not exist 遇到如下错误,那就需要制定REMAP_TABLESPACE参数: ORA-00959: tablespace 'SMS_MT' does not exist 以下是一个完整的使用范例: ...
select 'ALTER TABLE ' || TABLE_NAME || ' drop CONSTRAINT ' ||constraint_name || '; ' as v_sqlfrom user_constraintswhere CONSTRAINT_TYPE in ('R' ) andowner = 'ARTISAN'and upper(table_name) in ('TB_ARTSIAN_ATTR')union allselect 'ALTER TABLE ' || a.TABLE_NAME || ' drop CONST...