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Oracle Tutorials - Assign Data from a Deleted Row to Variables

By: FYIcenter.com

(Continued from previous topic...)

How To Assign Data of the Deleted Row to Variables?

If a DELETE statement is deleting a single row, you can assign column values of the deleted row to variables by using the RETURNING clause, which an extension of DELETE statements for PL/SQL. The tutorial script shows you how to do this:

CREATE TABLE emp_temp AS SELECT * FROM employees;

DECLARE
  fname VARCHAR2(10);
  lname VARCHAR2(10);
BEGIN
  DELETE FROM emp_temp WHERE employee_id = 100;
    RETURNING first_name, last_name INTO fname, lname;
  DBMS_OUTPUT.PUT_LINE('Name deleted = ' || fname || ' '
    || lname);

  -- This will not work because multiple rows deleted
  -- DELETE FROM emp_temp WHERE employee_id > 100;
    -- RETURNING first_name, last_name INTO fname, lname;
END;
/
Name deleted = Steven King

Similar to SELECT ... INTO, RETURNING ... INTO will not work if multiple rows are deleted.

(Continued on next topic...)

  1. Can DML Statements Be Used in PL/SQL?
  2. Can DDL Statements Be Used in PL/SQL?
  3. Can Variables Be Used in SQL Statements?
  4. What Happens If Variable Names Collide with Table/Column Names?
  5. How To Resolve Name Conflicts between Variables and Columns?
  6. How To Assign Query Results to Variables?
  7. Can You Assign Multiple Query Result Rows To a Variable?
  8. How To Invoke Built-in Functions in PL/SQL?
  9. How To Retrieve the Count of Updated Rows?
  10. What Is the Implicit Cursor?
  11. How To Assign Data of the Deleted Row to Variables?
  12. What Is a RECORD in PL/SQL?
  13. How To Define a Specific RECORD Type?
  14. How To Define a Variable of a Specific RECORD Type?
  15. How To Assign Values to Data Fields in RECORD Variables?
  16. How To Retrieve Values from Data Fields in RECORD Variables?
  17. How To Define a Data Field as NOT NULL?
  18. How To Define a RECORD Variable to Store a Table Row?
  19. How To Assign a Table Row to a RECORD Variable?
  20. How To Insert a RECORD into a Table?
  21. How To Update a Table Row with a RECORD?
  22. How To Define a Variable to Match a Table Column Data Type?

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