Question

I am using a PHP mySQL query. Struggling with a Joins.

mysql_query("SELECT * FROM electors WHERE telephone > 0")

Then I need it to select from a table called voting_intention with matching ID from the electors table of this query and get a column called pledge that is equal to ‘C’ OR ‘D’.

How do we do this in 1 mySQL query.

Answer 1

Your possible SQL statement will be,

SELECT voting_intention.pledge
FROM electors, voting_intention 
WHERE 
      electors.id =voting_intention.id 
  and electors.telephone > 0 
  and voting_intention.pledge in {'C','D'}