Need mysql query to find total sum as per matched query - mysql

Question

I need to find sum of specific columns as per matched some of columns value in database table.
Please check mysql table that i use :
CREATE TABLE IF NOT EXISTS `plant_production_items` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`plant_production_id` int(11) NOT NULL,
`materialid` int(11) NOT NULL,
`packaging_id` int(11) NOT NULL,
`grade_id` int(11) NOT NULL,
`slabs` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `material_purchase_id` (`plant_production_id`),
KEY `grade_id` (`grade_id`),
KEY `packaging_id` (`packaging_id`),
KEY `slabs` (`slabs`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=104 ;
Value are as under :
INSERT INTO `plant_production_items` (`id`, `plant_production_id`, `materialid`, `packaging_id`, `grade_id`, `slabs`) VALUES
(5, 4, 22, 85, 29, 4444),
(6, 5, 22, 14, 25, 3234),
(8, 6, 27, 21, 60, 4444),
(11, 8, 22, 85, 29, 44444),
(19, 7, 22, 84, 29, 434),
(75, 10, 26, 0, 51, 1233),
(76, 10, 24, 17, 34, 251),
(78, 10, 26, 0, 46, 3234),
(91, 9, 27, 21, 57, 1000),
(92, 9, 27, 21, 57, 2000),
(93, 3, 23, 16, 32, 5000),
(94, 3, 27, 21, 54, 3233),
(101, 3, 27, 21, 0, 700),
(103, 3, 29, 27, 0, 6666);
I want total sum of 'slabs' columns as per unique value founded in following column :
plant_production_id
materialid
packaging_id
grade_id
In short we need to find combination of all 4 values of above and need to show total sum of 'slabs' column.
For example :
there are two records which are same:
(91, 9, 27, 21, 57, 1000),
(92, 9, 27, 21, 57, 2000),
so here i want to get total sum i.e 1000+2000 = 3000
Out put should be all columns with total slabs. It is not required we need to match all above 4 columns. Actually we need to find all total slabs as per total records found same with above 4 column.
If still not clear then let me know.

Answer 1

You can use GROUP BY like this:
SELECT
plant_production_id,
materialidm,
packaging_id,
grade_id,
SUM(`slabs`) slabs_sum
FROM plant_production_items
GROUP BY plant_production_id, materialidm, packaging_id, grade_id;
So it gives the sum of the slabs for rows with the same values for columns grouped by.