Update table

[qplcjp]

I have on the form and subform like below, I would like to know why
the data on the field countAA, countBB and countCC will not update on
the table.
Please help

txtSubAA, txtSubBB, txtSubCC
and set their visible property to No.


Give them these controlsources.
txtSubAA
=Sum(IIF(select2 = "AA",1,0))
txtSubBB
=Sum(IIF(select2 = "BB",1,0))
txtSubCC
=Sum(IIF(select2 = "CC",1,0))


Then in your main form.
countAA
=IIF(select1 = "AA",1,0) + Nz(chpsubform.Form!txtSubAA)
countBB
=IIF(select1 = "BB",1,0) + Nz(chpsubform.Form!txtSubBB)
countCC
=IIF(select1 = "CC",1,0) + Nz(chpsubform.Form!txtSubCC)

 

[John Vinson]

I have on the form and subform like below, I would like to know why
the data on the field countAA, countBB and countCC will not update on
the table.

Because you don't have any controls bound to these fields.

A Form control can be bound to a table field *or* to an expression -
not both.

But you shouldn't be storing counts in a table anyway!
Storing derived data such as this in your table accomplishes
three things: it wastes disk space; it wastes time (almost
any calculation will be MUCH faster than a disk fetch); and
most importantly, it risks data corruption. If one of the
underlying fields is subsequently edited, you will have data
in your table WHICH IS WRONG, and no automatic way to detect
that fact.

Just redo the calculation whenever you need it, either as a
calculated field in a Query or just as you're now doing it -
in the control source of a Form or a Report textbox.

John W. Vinson[MVP]