MYSQL Query for pending `Purchase Order`

Question

how to query to database in order get pending po list.

I have four table purchase_order with this fields

`po_id` // primary key
`supplier_id`
'date`
`status`
'description`

`po_detail` with this fields
`pod_id` // primary key
`po_id`
`product_id`
`rate`
`qty`

`grn` with this fields
`grn_id` // primary key
`date`
`description`
`supplier_id`

`grn_detail` with this fields
`grnd_id` // primary key
`grn_id`
`rate`
`qty`
`product_id`
`po_id`

now i am to select all product from po_detail which is not entered in grn_detail with that po_id OR entered into grn_detail but grn_detail.qty is < po_detail.qty with same po_id could you please write the query. if possile please write with demo in sqlfiddle

please have look in SQLFIDDLE

Answer 1

first answer is quite well but i think there may little changes in operator. something like that >=

SEE DEMO

SELECT * FROM `po_detail`
WHERE
  `po_detail`.`po_id` NOT IN
    (SELECT `grn_detail`.`po_id` FROM `grn_detail`
     WHERE (`grn_detail`.`po_id` <> `po_detail`.`po_id`) OR
       (`grn_detail`.`qty` >= `po_detail`.`qty`))
AND your_other_filter_if_you_want_to

Answer 2

Try this:

SELECT * FROM `po_detail`
WHERE
  `po_detail`.`po_id` NOT IN
    (SELECT `grn_detail`.`po_id` FROM `grn_detail`
     WHERE (`grn_detail`.`po_id` <> `po_detail`.`po_id`) OR
           (`grn_detail`.`qty` > `po_detail`.`qty`))