Single speech marks in mysql queries
If I have a mysql query like:

    SELECT this FROM that WHERE id='10'

and

    SELECT this FROM that WHERE id=10

both seem to work correctly.

What is the use of the single speech marks in mysql queries?  When is it correct to use them?


Single speech marks in mysql queries
===

If I have a mysql query like:

    SELECT this FROM that WHERE id='10'

and

    SELECT this FROM that WHERE id=10

both seem to work correctly.

What is the use of the single speech marks in mysql queries?  When is it correct to use them?

