Author: Dev

ORA-02430: cannot enable constraint Oracle PL/SQL error message: ORA-02430: cannot enable constraint. Cause: The named constraint does not exist for this table. Solution: Check that a constraint exists before trying to enable it. Example: ALTER TABLE test ENABLE CONSTRAINT constraint_name; Output: ORA-02430: cannot enable constraint Check constraint SELECT OWNER, CONSTRAINT_NAME, STATUS FROM user_constraints WHERE table_name…(Continue Reading)

ORA-02443: Cannot drop constraint – nonexistent constraint Oracle PL/SQL error message: ORA-02443: Cannot drop constraint – nonexistent constraint. Cause: An attempt was made to drop a constraint that does not exist. Solution: Check if the constraint and table name are correct and try to run the drop command again. Example: ALTER TABLE test DROP CONSTRAINT…(Continue Reading)

In Oracle PL/SQL, a WHILE LOOP is used to execute a block of code repeatedly as long as a certain condition is true. The syntax for a WHILE LOOP is as follows: WHILE condition LOOP — code to be executed END LOOP; The condition is a Boolean expression that is evaluated before each iteration of…(Continue Reading)

In Oracle PL/SQL, a FOR LOOP is used to execute a block of code repeatedly for a fixed number of times. The syntax for a FOR LOOP is as follows: FOR loop_counter IN start_value..end_value LOOP — code to be executed END LOOP; The loop_counter is a variable that is used to control the loop and…(Continue Reading)

In Oracle PL/SQL, the EXIT statement can be used to exit a loop early, before it completes its normal iteration. The EXIT statement can be used with a WHEN clause, which specifies a condition under which the loop should exit. The syntax for using the EXIT statement with a WHEN clause is as follows: EXIT…(Continue Reading)