Question

I have a table ‘items’

Item_Code             |Rate  |Quantity
--------------------------------------
JOGGER-POWER-BLACK    |699   |5
JOGGER-POWER-WHITE    |599   |8    
JOGGER-PLAZA-WHITE    |1199  |2
SLEEPER-PLAZA-BLACK   |699   |6
SLEEPER-POWER-BLACK   |499   |5 

I want to Group by Part1-%-Part3 of Item_Code like following which is just idea

select (part1 and part3 of Item_Code) as 'Category-Color',sum(Quantity)
as Quantity group by (part1 and part3 of Item_Code)

By Parts I mean looking Item_Code in terms of Hyphen

Desired Output

Category-Color|Quantity
-------------------
JOGGER-BLACK  |5
JOGGER-WHITE  |10
SLEEPER-BLACK |11 

“regular expressions in group by clause”,”group by with regular expression”. Google/Bing giving nothing relevant

I am unable to understand whether database developers are not required to provide this feature or how they do it. I am required such grouping by the Store owner. e.g Category (Part1) wise Sum of quantities.

Answer 1

SELECT CONCAT(SUBSTRING_INDEX(Item_Code, '-', 1), '-', 
              SUBSTRING_INDEX(Item_Code, '-', -1)) AS Category_Color,
       SUM(Quantity) AS Quantity
FROM items
GROUP BY 1;

Example: SQLFiddle