The syntax to disable a foreign key in Oracle/PLSQL is: ALTER TABLE table_name DISABLE CONSTRAINT constraint_name;Example If you had created a foreign key as follows: CREATE TABLE supplier ( supplier_id numeric(
alter table p_table disable novalidate primary key * ERROR at line 1: ORA-02297: cannot disable constraint (ORA1.PK_PTABLE_ID) - dependencies exist 说明:disable novalidate无法直接禁用主键,因为存在外键引用该主键. --先使用disable validate使外键失效 SQL> alter table f_table disable validate constr...
In this post, I am sharing one option to Disable / Enable the Foreign Key Constraint in PostgreSQL. During data migration and testing purpose, Database Developer requires to disable Foreign key constraint of a Table. Once you disable constraint, then later you might need to...
oracle enable / disable all constraint begin for i in (select constraint_name, table_name from user_constraints where table_name='') LOOP execute immediate 'alter table '||i.table_name||' enable constraint '||i.constraint_name||''; end loop; end; / COMMIT; -- begin for i in (selec...
oracle enable / disable all constraint begin for i in (select constraint_name, table_name from user_constraints where table_name='') LOOP execute immediate 'alter table '||i.table_name||' enable constraint '||i.constraint_name||'';
最近在看tom的《Effective Oracle by design》,其中第6章6.3.8节有个例子是给表添加主键,但是不想对已经存在的数据进行校验: alter table dept add constraint dept_pk primary key(deptno) rely enable novalidate; 我经过测试,发现即使加上novalidate语法也还是要检验的,测试如下: ...
SQL> alter table a modify constraint ck_a disable validate; Table altered. --oracle 的语法真奇怪,前面我使用的是alter table a disable validate constraint ck_a;也可以。 --还是这里使用的语法更好1点。 SQL> insert into a values(19);
Disable or enable all triggers belonging to the table except for internally generated constraint triggers such as those that are used to implement foreign key constraints or deferrable uniqueness and exclusion constraints. (内部用于foreign key, unique, 排他 等约束的触发器除外) ...
FOREIGN KEY (mgr_no)REFERENCES emp(emp_no)ON DELETE SET NULL;ALTER TABLE empDISABLE CONSTRAINT emp_emp_no_pkCASCADE;ALTER TABLE empENABLE CONSTRAINT emp_emp_no_pk; Which two statements are true after execution? A、 The primary key constraint will be enabled and DEFERRED. B、 The primary ...
oracle enable / disable all constraint begin for i in (select constraint_name, table_name from user_constraints where table_name='') LOOP execute immediate 'alter table '||i.table_name||' enable constraint '||i.constraint_name||'';