Question

im trieng to select data from 3 diffrent tables, i want to select the data and filter it that the fullname dont apper twice and the number of order from this fullname will grouped to one. i tried these query but it gave me an error, can you help me?

SELECT 
   `biz`.`id`, 
   `deals`.`biz_id`,
   `deals`.`id` as `deal_id`,
   `deals`.`name`, 
   `orders`.`id`,
   `users`.`username`,
   `users`.`fullname`,
   `users`.`id` as `user_id`,
   `orders`.`dealid`, 
   `orders`.`userid` ,
    COUNT(`orders`.`userid`) as `num` 
FROM 
  `deals`,
  `users`,
  `orders` 
WHERE 
  `deals`.`biz_id` = '{$User['id']}' 
  AND `orders`.`dealid` = `deal_id` 
  AND `users_id` = `deals`.`userid`

Answer 1

In your statement, the first field you are selecting is ‘id’ field from ‘biz’ table. However, ‘biz’ table is not in your FROM clause.

I think I can guess how to fix it:

SELECT 
   `biz`.`id`, 
   `deals`.`biz_id`,
   `deals`.`id` as `deal_id`,
   `deals`.`name`, 
   `orders`.`id`,
   `users`.`username`,
   `users`.`fullname`,
   `users`.`id` as `user_id`,
   `orders`.`dealid`, 
   `orders`.`userid` ,
    COUNT(`orders`.`userid`) as `num` 
FROM 
  `biz`,
  `deals`,
  `users`,
  `orders` 
WHERE 
  `deals`.`biz_id` = '{$User['id']}' 
  AND `biz`.`id` = `deals`.`biz_id`
  AND `orders`.`dealid` = `deal_id` 
  AND `users_id` = `deals`.`userid`
GROUP BY `orders`.`userid