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By: FYIcenter.com

(Continued from previous topic...)

How To Delete All Rows from a Table?

If you want to delete all rows from a table, you have two options:

  • Use the DELETE statement with no WHERE clause.
  • Use the TRUNCATE TABLE statement.

The TRUNCATE statement is more efficient the DELETE statement. The tutorial exercise shows you a good example of TRUNCATE statement:

SELECT COUNT(*) FROM fyi_links;
  COUNT(*)
----------
         3

TRUNCATE TABLE fyi_links;
Table truncated.

SELECT COUNT(*) FROM fyi_links;
  COUNT(*)
----------
         0

  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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