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Oracle Tutorials - Use Existing Column Values in SET Clause

By: FYIcenter.com

(Continued from previous topic...)

How To Use Existing Values in UPDATE Statements?

If a row matches the WHERE clause in a UPDATE statement, existing values in this row can be used in expressions to provide new values in the SET clause. Existing values are represented by columns in the expressions. The tutorial exercise below shows a good example:

UPDATE fyi_links SET id = 1000 + id, counts = id*2 
  WHERE id >= 250;
3 rows updated.

SELECT * FROM fyi_links WHERE id >= 250;
   ID URL                  NOTES         COUNTS CREATED
----- -------------------- ------------ ------- ---------
 1250 Retail Sales.com     Wrong URL        500 07-MAY-06
 1260 Recruiting.com       Wrong URL        520 07-MAY-06
 1270 Payroll.com          Wrong URL        540 07-MAY-06

This statement increased values in the id column by 1000.

(Continued on next topic...)

  1. What Are DML Statements?
  2. How To Create a Testing Table?
  3. How To Set Up SQL*Plus Output Format?
  4. How To Insert a New Row into a Table?
  5. How To Specify Default Values in INSERT Statement?
  6. How To Omit Columns with Default Values in INSERT Statement?
  7. How To Insert Multiple Rows with One INSERT Statement?
  8. How To Update Values in a Table?
  9. How To Update Values on Multiple Rows?
  10. How To Use Existing Values in UPDATE Statements?
  11. How To Use Values from Other Tables in UPDATE Statements?
  12. What Happens If the UPDATE Subquery Returns Multiple Rows?
  13. How To Delete an Existing Row from a Table?
  14. How To Delete Multiple Rows from a Table?
  15. How To Delete All Rows from a Table?

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