Difference between revisions of "Delete Queries"

From TRCCompSci - AQA Computer Science
Jump to: navigation, search
Line 11: Line 11:
 
</syntaxhighlight>
 
</syntaxhighlight>
  
 +
==Notes==
 
* Not specifying which records to delete will result in every record being deleted
 
* Not specifying which records to delete will result in every record being deleted
 
:*The same can be achieved with 'DELETED * FROM table'
 
:*The same can be achieved with 'DELETED * FROM table'
 
* This process cannot be undone
 
* This process cannot be undone
 
* Not to be confused with DROP, for deleting columns and tables.
 
* Not to be confused with DROP, for deleting columns and tables.

Revision as of 23:32, 21 December 2016

Used for deleting rows from a table.

   DELETE FROM table WHERE column1=value1;

or:

   DELETE FROM table WHERE column1=value1 AND column2=value2;

Notes

  • Not specifying which records to delete will result in every record being deleted
  • The same can be achieved with 'DELETED * FROM table'
  • This process cannot be undone
  • Not to be confused with DROP, for deleting columns and tables.