why would you use WHERE 1=0 statement in SQL?

Question

I saw a query run in a log file on an application. and it contained a query like:

SELECT ID FROM CUST_ATTR49 WHERE 1=0

what is the use of s

Answer 1

An example of using a where condition of 1=0 is found in the Northwind 2007 database. On the main page the New Customer Order and New Purchase Order command buttons use embedded macros with the Where Condition set to 1=0. This opens the form with a filter that forces the sub-form to display only records related to the parent form. This can be verified by opening either of those forms from the tree without using the macro. When opened this way all records are displayed by the sub-form.