Column 'mary' does not exist

Question

i\'m doing a simple query here and it returns that column \'Mary\' does not exist:

SELECT  telephone.telephonenumber as tel
FROM    person, telephone
WHERE           


        

Answer 1

Make sure that you are quoting your string correctly.

From your snippet, I'd say that's the problem here since you're using something else than simple single quotes.

Answer 2

Use plain single quotes to delimit a string literal 'Mary' not smart quotes ‘Mary’