Question

I am using MySQL 5.5. I have a query which returns results like this

quantity| maxPrice| minPrice |avgPrice| counts
"10"    "23.50"   "23.50"  "23.500000"  "1"
"15"    "15.75"   "15.75"  "15.750000"  "1"
"23"    "100.71"  "100.71" "100.710000" "1"
"25"    "210.00"  "200.00" "205.000000" "2"

now from this data I want to extract the maximum quantity tuple and sum of all counts… so that result would look like this

quantity| maxPrice| minPrice |avgPrice| counts
"25"    "210.00"  "200.00" "205.000000"  5

how do I write query for this?

Answer 1

Use ORDER BY quantity DESC and LIMIT 1 to extract the tuple. Surround your query with another select and use SUM(counts) AS counts for the total.

Example:

SELECT 
 x.quantity, x.maxPrice, x.minPrice, 
 x.avgPrice, SUM(x.counts) AS counts
FROM 
(
 SELECT * 
 FROM mytable
 ORDER BY quantity DESC
) AS x
LIMIT 1;

Replace SELECT * FROM mytable with your real query.