MySQL select “accumulated” column

Question

I\'m not sure what to call this besides an \"accumulated\" column.

I have a MySQL table with a column that looks like

+---+
|val|
+---+
| 1 |
| 4 |
|         


        

Answer 1

I would use a cursor:

>>> import MySQLdb
>>> db = MySQLdb.connect("localhost","username","password","test")
>>> cur = db.cursor()
>>> cur.execute("select myval from mytable")
>>> rs = cur.fetchall()
>>> accumulator = 0
>>> for r, in rs:
...   accumulator += r
...   print r, accumulator
...
1 1
4 5
6 11
3 14
2 16
5 21