mysql left outer join

Question

I have two tables:

1. employee with fields employee_id, firstname, middlename, lastname
2. timecard with fields employee_id,time-

Answer 1

You are filtering tc_date_transaction which filters all null values in this field, even those generated by the outer-join and therefore defeats its purpose. Move the filter "tc_date_transaction = "17/06/2010"" into the join clause and it will work.

SELECT * 
  FROM employee LEFT OUTER JOIN timecard 
       ON employee.employee_id = timecard.employee_id and tc_date_transaction = "17/06/2010";

or write

SELECT * 
  FROM employee LEFT OUTER JOIN timecard 
       ON employee.employee_id = timecard.employee_id 
  where (tc_date_transaction = "17/06/2010" or tc_date_transaction is null);