Mysql查询查找具有相同列值的字段总和

Question

I have a table like this

id |  invent_id         |   order
 1 | 95948214           | 70
 2 | 46018572           | 30
 3 | 46018572           | 20
 4 | 46018572           | 50
 5 | 36025764           | 60
 6 | 36025764           | 70
 7 | 95948214           | 80
 8 | 95948214           | 90

I want get the sum of order qty with same invent id

That is the want the result like this

   |  invent_id         |   order
   | 95948214           | 240
   | 46018572           | 100
   | 36025764           | 130

how can we write the mysql query

Answer 1

Make use of Aggregate function SUM and grouped them according to invent_id .

SELECT invent_id, SUM(`order`) `Order`
FROM tableName
GROUP BY invent_ID

GROUP BY clause

SQLFiddle Demo