So, we can easily find all the constraints on the table in Oracle using data dictionary views. We can then take whatever action like modify, disable, or drop, we want to take on these constraints. Constraints are enforcing data integrity rules in the Oracle database and we must be careful...
我将这两个查询合并为一个查询,首先使用order by处理外键(constraint_type='R'): begin for r in ( select 'alter table '||table_name||' disable constraint '||constraint_name as statement from user_constraints where status = 'ENABLED' order by case constraint_type when 'R' then 1 else 2 ...
EXECUTE IMMEDIATE 'alter table "' ||i.table_name|| '" disable constraint ' ||i.constraint_name; END LOOP i; FOR i IN (SELECT table_name, constraint_name -- then disable all constraints FROM user_constraints WHERE status = 'ENABLED' ) LOOP EXECUTE IMMEDIATE 'alter table "' ||i.table...
ALTERTABLEtable_nameDROPCONSTRAINTconstraint_name; 禁用约束 默认情况下,约束在创建是启动,可以再创建时禁用约束。 ALTERTABLEtable_nameADDCONSTRAINTconstraint_nameUNIQUE(column_name) DISABLE; 启动约束、禁用约束 ALTERTABLEtable_name {ENABLE|DISABLE }CONSTRAINTconstraint_name; 启动约束时表中数据必须满足约束条件,...
字表和父表必须在同一个数据库。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...
disable / enable 也可以。 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....
(select owner,index_name from dba_indexes where tablespace_name='<tablespace_name>'); 2) Disable the constraint: 禁用约束: SQL> ALTER TABLE <table_name> DISABLE CONSTRAINT <constraint_name>; 3) Drop the tablespace: 删除表空间: SQL> DROP TABLESPACE <tablespace_name> INCLUDING CONTENTS AND ...
ALTER TABLE TABLENAME DROP CONSTRAINTS COLUMN CASCADE; –删除约束 ALTER TABLE TABLENAME DISABLE PRIMARY_COLUMN ; –设置被设置为主键的列为无效 DROP INDEX INDEX_NAME; –删除主键索引 2,查看主键约束 SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_TYPE=’P’ AND TABLE_NAME=’你要查看的表名’ AND ...
我将这两个查询合并为一个查询,首先使用order by处理外键(constraint_type='R'): begin for r in ( select 'alter table '||table_name||' disable constraint '||constraint_name as statement from user_constraints where status = 'ENABLED' order by case constraint_type when 'R' then 1 else 2 ...
C(check constraint on a table) P(primary key) U(unique key) R(referential integrity) V(with check option, on a view) O(with read only, on a view) http://docs.oracle.com/cd/B28359_01/server.111/b28286/clauses002.htm http://docs.oracle.com/cd/B28359_01/server.111/b28320/stat...