add a percentage to an initial value in access

Not clear exactly what you want.  Are you looking for a query that does this in new columns?  New rows?  Or do you want to insert new rows into an existing table?  "and so on..." can't go on forever, so when do you want to stop?

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»bp

Hi, sorry for not being too specific. I want to update a column in a table where only the first value is set, which is actually an open balance and I want to add the interest for the following rows in the column.

the table will be updated monthly with days from the previous month so the calculation must continue. It would normally last for a year.

I am already performing a running sum by day in a query for the same table

can you send some sample data and the expected output.

the table looks like this

date (as date) |date (as number) |commission (as number)|balance(number)|

30/06/2017     |42916                     |0                                          |100
01/07/2017     |42917                     |45                                        |      I want here 100 +10% = 110
03/07/2017     |42919                     |12                                        |      I want here 110 +10% = 121
05/07/2017     |42921                     |31                                        |      I want here 121+10% = 131.1
06/07/2017     |42922                     |41                                        |

my query looks like this

date (as number) |commission (as number)|running sum for commission | balance
42916                     |0                                          |0                                                   |100
42917                     |45                                        |45                                                |      I want here 100 +10% = 110
42919                     |12                                        |57                                                 |      I want here 110 +10% = 121
42921                     |31                                        |88                                                 |      I want here 121+10% = 131.1
42922                     |41                                        |121

I either want the column Balance in the table to be updated adding 10% to each value or another column in the query with the same figures

Thank you Ryan, I can't figure out what should I replace "b" with

You do not have to replace b, just replace "yourTable" with your table name.

b in the query is an alias.

well, I did that in the beginning and when I run the query it asks me for "Enter parameter value b.id" and a.id

ok, I finally figured it out. I've replaced id with the date field. Thank you very much, Ryan, and Kumar.