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Don Burleson Blog 







Oracle SQL Where 1=1

Oracle Database Tips by Donald BurlesonAugust 31, 2015

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".

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