Question

Well, pretty simple question I think, but I can’t find a satisfying answer.
Is there a difference between these two queries?

SELECT * FROM table WHERE column1 = 'x' OR column2 = 'x'

SELECT * FROM table WHERE (column1 = 'x' OR column2 = 'x')

Thanks in advance

Answer 1

Right now there is NO difference in your queries.

There would be difference if there would be AND condition as addition in your query.

e.g

SELECT * FROM table WHERE id=1 AND column1 = 'x' OR column2 = 'x'

and

SELECT * FROM table WHERE id=1 AND (column1 = 'x' OR column2 = 'x')

Note

SELECT * FROM table WHERE id=1 AND column1 = 'x' OR column2 = 'x'

would be equivalent to

SELECT * FROM table WHERE (id=1 AND column1 = 'x') OR column2 = 'x'

Hope you get the difference.