selecting form a mysql query where the string field is empty?

I am trying to select rows from a mysql table where some fields are empty but it returns nothing.

Say I have a string field in my table which is empty, the following query doesn't work as expected:

SELECT * FROM myTable WHERE `Field1`=''

PHP:

How do I resolve it?

 

Try

SELECT * FROM myTable WHERE `Field1` LIKE '_________' 

PHP:

__ is a empty space

 

The field may also be null so do something like

SELECT * FROM myTable WHERE `Field1`='' or `Field1`is null

Code (sql):

 

Thanks for replies
That "IS NULL" worked for me but I couldn't get "LIKE '_______'" working.