how to add two rows in mysql

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Hi I have a table called temp_reading in this i have the following columns :

meterid consumption  total

1          100

1           150

1          200

1          300

now i want the total like

meterid    consumption            total

 1             100                 100

 1             150                 250

 1             200                450

 1             300                750

i tried the following query

SQL

select meterid,consumption,sum(consumption) as total from temp_reading group by meterid;

please help me

[edit]code block added[/edit]

Posted 17-Nov-12 1:36am

Member 9606980

Updated 17-Nov-12 1:38am

Nelek

v2

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André Kraak · Accepted Answer · 2012-11-17T08:09:00

Solution 1

It looks like you are trying to add a running total to your query.
This article Calculating simple running totals in SQL Server[^] describes several ways this can be achieved.

Posted 17-Nov-12 8:09am

André Kraak

Comments

Member 9606980 19-Nov-12 1:22am

i tried the following query
select a.meterid,a.consumption, (select sum(b.consumption) from temp_reading b where b.meterid<=a.meterid) as total from temp_reading a order by a.meterid;
but i am getting the following result
meterid consumption total
1 450 700
1 100 700
1 50 700
1 100 700
it is caliculating 450+100+50+100 = 700 and this value is displaying
but i want to display like:
meterid consumption total

1 450 450

1 100 550

1 50 600

1 100 700