SYS.ALL_CONSTRAINTS的定义如下: CREATE OR REPLACE VIEW ALL_CONSTRAINTS AS select OWNER, CONSTRAINT_NAME, CONSTRAINT_TYPE, TABLE_NAME, SEARCH_CONDITION, SEARCH_CONDITION_VC, R_OWNER, R_CONSTRAINT_NAME, DELETE_RULE, STATUS, DEFERRABLE, DEFERRED, VALIDATED, GENERATED, BAD, RELY, LAST_CHANGE, INDEX_...
分布式数据库中,外键不能跨节点,但触发器可以Ifeither the childorparent objectisaview,thentheconstraintissubjecttoallrestrictionsonviewconstraints. See "ViewConstraints". You cannot define aforeignkeyconstraintinaCREATETABLEstatement thatcontainsanASsubquery clause. Instead, you mustcreatethetablewithout theconstr...
SELECT* FROMall_constraints WHEREtable_name ='T_USER'ANDowner ='SCOTT'; 结果如下: 1 2 3 4 5 6 7 SQL>SELECT* 2FROMall_constraints 3WHEREtable_name ='T_ORDER'ANDowner ='SCOTT'; OWNER CONSTRAINT_NAME CONSTRAINT_TYPE TABLE_NAME SEARCH_CONDITION R_OWNER R_CONSTRAINT_NAME DELETE_RULE STATU...
1. 常用视图 (权限由大到小: dba_* > all_* > user_*) (1) dba_constraints : 侧重约束具体信息 (2) dba_cons_columns: 侧重约束列信息 2. 参考如下 select * from dba_constraints dc where dc.owner = 'SCOTT' and dc.table_name = 'EMP'; select * from dba_cons_columns dcc where dcc.o...
and finally creates all constraints. This avoids problems. It is possible to migrate the database to an Oracle database in stages. For example, you can first create the users and their tables, then create the constraints, and finally load the data. However, doing this might cause problems ...
You can specify that an individual constraint is immediate or deferred, or you can set the timing for all constraints in a single transaction. Finally, you can temporarily suspend the enforcement of constraints for a particular table. When you enable the operation of the constraint, you can ...
E) All constraints defined on HR. EMPLOYEES are dropped. F) All indexes defined on HR. EMPLOYEES are dropped. Answer:DEF Q2.Which three statements are true about the naming methods and their features supported by Oracle database used to resolve connection information?
oracle的完整性约束IntegrityconstraintsforOracle 系统标签: constraints约束integrityoracle键约束constraint oracle的完整性约束(IntegrityconstraintsforOracle)IntegrityconstraintsforOracleIntegrityconstraintsareusedtoenhancedataintegrity,andOracleprovides5integrityconstraints:CheckNOTNULLUniquePrimaryForeignkeyIntegrityconstraintsarearu...
使用系统用户登录 [username/password][@server][as sysdba|sysoper] 查看登录的用户 show user 启用...
all_cons_columns b JOIN all_constraints c ON b.CONSTRAINT_NAME = c.CONSTRAINT_NAME AND b.table_name = c.table_name AND b.owner = c.owner WHERE constraint_type = 'P' ) d ON c.owner = d.owner and c.table_name = d.table_name and c.column_name = d.column_name ...