oracle apex sql alter table constraint reference

Similar Queries can be used for selecting constraints on DEPT Table SQL> select CONSTRAINT_NAME C_NAME,INDEX_NAME,CONSTRAINT_TYPE,Search_condition,R_CONSTRAINT_NAME R_NAME from user_constraints where TABLE_NAME='DEPT' If there are multiple columns present in the constraints, Position will specify the order of the column in the constraint

We will get null values for the Position column if we have a single column in the constraint. SQL> select OWNER,CONSTRAINT_NAME ,COLUMN_NAME,POSITION from User_cons_columns where TABLE_NAME='EMP' Now Primary key, Foreign Key, and Unique key constraints columns can be found using the below query SQL> column OWNER format a10 Here CONSTRAINT_TYPE define the type of constraintsĬ stands for check constraints or not null constraints Select CONSTRAINT_NAME C_NAME,INDEX_NAME,CONSTRAINT_TYPE,Search_condition,R_CONSTRAINT_NAME R_NAME from user_constraints where TABLE_NAME='EMP' Now constraints can be found using the below oracle select constraint queries SQL> col CONSTRAINT_NAME format a20 Lets first create the Tables SQL> CREATE TABLE 'DEPT'ĬONSTRAINT 'PK_DEPT' PRIMARY KEY ('DEPTNO')ĬONSTRAINT 'PK_EMP' PRIMARY KEY ('EMPNO'),ĬONSTRAINT 'FK_DEPTNO' FOREIGN KEY ('DEPTNO')

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Oracle apex sql alter table constraint reference