Question: : I have seen a SQL statement
in my database that looks like this where 1=1:
Select stuff from mytab where 1=1;
What is the point in adding 1=1 to a SQL query?
Answer: In PL/SQL systems, dynamic SQL is
created using the EXECUTE IMMEDIATE clause.
In these systems, the end-user specifies query filtering
conditions, but sometime they will have no conditions at all,
meaning that no WHERE clause is required in the dynamic SQL.
In sum, the “where 1=1” is a used as a placeholder for the WHERE
clause so that ah-hoc filtering predicates can be easily added to
the query, and the query will execute, even in the absence of
specified filtering conditions.
Also, see these notes on
SQL with “where 1=2”.
|
|
 |
|
Guarantee your Success!
Oracle is the
world's most complex, robust and flexible database, considered
impossible to master without a mentor.
That's why all BC
Oracle trainers are working professionals, experts in Oracle who
share their tips and secrets. |
|
| |
|
Burleson is the American Team
Note:
This Oracle
documentation was created as a support and Oracle training reference for use by our
DBA performance tuning consulting professionals.
Feel free to ask questions on our
Oracle forum.
Verify
experience!
Anyone
considering using the services of an Oracle support expert should
independently investigate their credentials and experience, and not rely on
advertisements and self-proclaimed expertise. All legitimate Oracle experts
publish
their Oracle
qualifications.
Errata?
Oracle technology is changing and we
strive to update our BC Oracle support information. If you find an error
or have a suggestion for improving our content, we would appreciate your
feedback. Just
e-mail:
 and include the URL for the page.
Copyright ? 1996 - 2012
All rights reserved.
Oracle ?
is the registered trademark of Oracle Corporation.
|
|
