OR WHERE and AND in mySQL Query

Question

Basically, I\'m trying to get data from an SQL based on two different groups, t.type has to equal single and t.status has to equal

Answer 1

You can use the IN condition:

WHERE 
    t.type = 'single' AND t.status = '1' AND t.org IN ('RA','DUAL')

Or you can use brackets to group conditions:

WHERE
    t.type = 'single' AND t.status = '1' AND (t.org = 'RA' OR t.org = 'DUAL')

Answer 2

AND has higher precedence than OR, so your existing expression is currently evaluated as:

WHERE 
    (t.type = 'single' AND t.status='1' AND t.org = 'RA') OR t.org = 'DUAL'

To force alternative logic, one needs to include explicit parentheses:

WHERE 
    t.type = 'single' AND t.status='1' AND (t.org = 'RA' OR t.org = 'DUAL')

However, in this case, one can use MySQL's IN() operator instead of OR:

WHERE 
    t.type = 'single' AND t.status='1' AND t.org IN ('RA','DUAL')