how to compare two tables fields name with another value in mysql?

Posted by I Like PHP on Stack Overflow See other posts from Stack Overflow or by I Like PHP
Published on 2010-02-03T22:34:26Z Indexed on 2010/03/08 23:06 UTC
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I have two tables

  1. table_school

    school_open_time|school_close_time|school_day
    8:00 AM         | 9:00PM          | Monday
    10:00 AM        | 7:00PM          | Wednesday
    
  2. table_college

     college_open_time|college_close_time|college_day    
     10:00 AM         | 8:00PM           | Monday
     10:00 AM         | 9:00PM           | Tuesday
     10:00 AM         | 5:00PM           | Wednesday
    

Now I want to select school_open_time school_close time, college_open_time and college_close_time according to today (means college_day=school_day=today), and also if there is no row for a specific day in any of one table then it display blank field ( LEFT JOIN , I think I can use).

Please suggest me best and optimized query for this.

UPDATE:

if there is no open time and close time for school then college_open_time and college_close_time has to be returned( not to be filled in database,just return) as school_open_time and school_close_time. and there always must be college_open_time and college_close_time for a given day

MORE UPDATE: i m using below query

 SELECT college_open_time,college_close_time ,school_open_time,
        school_close_time  FROM tbl_college
 LEFT JOIN tbl_school ON school_owner_id=college_owner_id 
 WHERE college_owner_id='".$_session['user_id']."' AND
 college_day='".date('l',time())."'";

it return single row (left hand having some value and right hand having blank value) when there is no row of a given day in table_school, BUT display seven rows with same value on left hand side(college_open_time, college_close_time) and 6 blank row on right hand side (school_open_time and school_close_time)

i need only one row when both table have a row of a given day

but using above query take only first row of corresponding table_school where school_owner_id is 50(let), it not see the condition that school_day name should be given day

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