MySQL - How do i get the Mode from a group by Select - mysql

Question

I have created a bunch of MySQL script that import products into magento, i have used a GROUP BY to group products into configurable products
in the past, i have used MIN() to get the lowest price in the group and used that value as the price for the configurable products but as of late there have been some cases like this
Simple Product ID | Price ($)
------------------------------
1001 | 10
1002 | 10
1003 | 5
1004 | 10
1005 | 20
1006 | 10
in this situation, when i create the configurable product, MIN(Price) would return 5, i only just learned that with configurable products i could have a negative difference which means now i need to change my code so instead of getting minimum (5) i get the Mode (10)
I figured i just have to replace the MIN() in my query with MODE() but there doesn't seem to be a MODE() function for MySQL, here's an example of the query i'm using
INSERT INTO import_table
(
product_id, stock_id, price
)
SELECT ODT.product_id, ODT.stock_id, MIN(ODT.Price)
FROM org_data_table AS ODT
GROUP BY ODT.stock_id
Is there a function that already exists to get the Mode? if not then what do i need to do to get it, i would like to just change the MIN() part of my query

Answer 1

You can retrieve the MODE of price through below query
SELECT ODT.Price as price, count(ODT.Price) AS cnt
FROM org_data_table as ODT
GROUP BY ODT.price
ORDER BY cnt DESC
LIMIT 1;
This will return the Price Mode value, and then you can utilize this in SELECT statement as below so you can insert the Mode value, see below query:
INSERT INTO import_table
(
product_id, stock_id, price
)
SELECT ODT.product_id, ODT.stock_id, (SELECT ODT.Price as price
FROM org_data_table as ODT
GROUP BY ODT.price
ORDER BY count(ODT.Price) DESC
LIMIT 1) as price
FROM org_data_table AS ODT
GROUP BY ODT.stock_id

Answer 2

This can be a little tricky because MODEs can have multiple prices -- if 2 prices have the same count, then they are both considered the MODE.
This query should return any records from the org_data_table whose price is in the MODE:
SELECT DISTINCT T.Product_Id, T.Stock_Id, T.Price
FROM org_data_table T
JOIN (
SELECT COUNT(*) cnt, Price
FROM org_data_table
GROUP BY Price
HAVING COUNT(*) = (
SELECT Max(cnt)
FROM (
SELECT COUNT(*) cnt, Price
FROM org_data_table
GROUP BY Price
) t
)
) T2 ON T.Price = T2.Price
And here is some sample Fiddle: http://sqlfiddle.com/#!2/8f1a2/1
Obviously you can add:
INSERT INTO import_table (product_id, stock_id, price)
before the query to insert the records.
Hope this helps.