mysql count the sum of all rows

问题

I have a mysql table that has a number of rows, and in each row a field called "value", the field value will differ from row to row. What I want, is to select all the rows and count the sum of all the "value" fields.

any idea?

回答1:

Do you mean like this?

SELECT    SUM(value)
FROM      myTable

If you have multiple columns to return, simply add each non-aggregate (i.e., summed) row to the GROUP BY clause:

SELECT    firstName, lastName, SUM(value)
FROM      myTable
GROUP BY  firstName, lastName

回答2:

SELECT SUM(value) as total FROM table;

$row['total'];

回答3:

SELECT SUM(`value`) FROM `your_table`

回答4:

SELECT SUM(value)
    FROM YourTable

回答5:

What you'll want is the GROUP-function named SUM.

回答6:

This query will return the sum of value and the number of rows count:

SELECT count(*), sum(value) FROM tablename

来源：https://stackoverflow.com/questions/6131197/mysql-count-the-sum-of-all-rows