
		 The application permits you to enter in this box a value to use in selecting records out of the data, by comparing the data values for this field to the value you specify.  

For EXAMPLE, if you keep the height of all police officers in the Personnel table for a police department, and you want a list of all officers exactly six feet tall, then you must compare the field called 'height' to a comparison value of 60 inches.  All officers with height = 60 inches, in English-like language, is an expression which yields a list or subset of officers whose height (a field) matches the value (60 inches) which you specified.  

You can, by specifiying comparison values for more than one field, extract rather precisely tailored subsets of the data for your own purposes.
	
