limiting the rows to where the sum a column equals a certain value in MySQL

Question

I want to write a query which returns all rows until the sum of one of the columns value reaches a certain value.

For example in the table below:

Answer 1

As no DBMS is given, the following is an ANSI SQL solution which works on a wide range of DBMS:

select *
from (
    select date_column, 
           etc, 
           sum(Meeting) over (order by date_column asc) run_sum
    from meetings
) t
where run_sum <= 7
order by date_column asc;

(I used the column name date_column instead of date because DATE is a reserved word in SQL and should not be used as a column name to avoid problems)

Answer 2

Here's a way which should work in MySQL :

SELECT
  O.Id,
  O.Type,
  O.MyAmountCol,
  (SELECT
     sum(MyAmountCol) FROM Table1
   WHERE Id <= O.Id) 'RunningTotal'
FROM Table1 O
HAVING RunningTotal <= 7

It involves calculating a running total and selecting records while the running total is less than or equal to the given number, in this case 7.

SQL Fiddle