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...
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,...
zx@ORA11G>altertablet1 add constraint t1_uk unique(id)using index idx_t_id disable novalidate; Tablealtered. zx@ORA11G>selecttable_name,constraint_name,constraint_type,deferrable,status,validatedfromuser_constraintswheretable_name='T1'; TABLE_NAME CONSTRAINT_NAME C DEFERRABLE STATUS VALIDATED --- ...
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...
--约束(主键、非空、唯一、check、外键、默认)--创建表的同时创建约束--方式一:直接将约束写在字段的后面create table student( sno int primary key,--主键 sname varchar2(20) not null,--非空 sex varchar2(2) check(sex in ('男','女')),--check(sex ='男 oracle address primary default 湖南...
(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 ...
SELECT 'alter table '||owner||'.'||table_name||' disable constraint '||constraint_name||';' from dba_constraints where constraint_type='R' and owner in (需要同步的用户); 将输出结果复制执行即可! 禁用job 代码语言:javascript 代码运行次数:0 运行 AI代码解释 alter system set job_queue_proces...
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....
Instead, use a CHECK constraint with the IS [NOT] NULL condition. 唯一约束 唯一约束的限制: 文档原文如下: Restrictions on Unique Constraints Unique constraints are subject to the following restrictions: None of the columns in the unique key can be of LOB, LONG, LONG RAW, VARRAY, NESTED TABLE...