Why MySQL's LEFT JOIN is returning “NULL” records when with WHERE clause?

Question

Today I\'ve tried some more complex MySQL queries and I\'ve noticed that MySQL\'s LEFT JOIN is not working with WHERE clause. I mean, it does return some records but it does not

Answer 1

First Case :

After joining, the records are getting filtered by the (WHERE clause). So only 1 result.

Second Case (when you replace WHERE with AND)

Will return all join entries + entries satisfied in second condition (t2.rank != 17). That is why here you get 2 records ( one from join + another from AND clause)