mysql count the sum of all rows

I have a mysql ta开发者_开发问答ble 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?

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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

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SELECT SUM(`value`) FROM `your_table`

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SELECT SUM(value) as total FROM table;

$row['total'];

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SELECT SUM(value)
    FROM YourTable

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

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

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