VBA Access - Multiple Tables count by date - ms-access

Question

We'd like to count from an Access database that has multiple tables - about 50.
We need to count from 1 column in each table that is 'QCPASS' This is a check box - if a product passed the box was checked if failed then not. We need to count both for EACH table, also allowing the user to specify a date range from a date column that exists in every table.
I've tried this with a query but I am told the query is unable to select, count and do the date range. Any VBA help would be great.
Exporting to Excel would be great, but any results would be fine. Here is the query I created that counts in a column from each table passes and failures. I can't iterate with a query either, so VBA seems the way to go:
SELECT "Table1" , Count('qcpass') AS column
FROM 5000028
GROUP BY [5000028].qcpass
union
SELECT "Table2",count('qcpass')
FROM 5000029
Group By [5000029].qcpass;

Answer 1

You can traverse the full TableDefs collection in your database, and create a query using VBA.
A word of warning: The TableDefs collection has the Access database system tables, so you need to skip this. A way I suggest you is to check for a specific table name prefix (it is noted in the code below).
public sub createMyBigUnionQuery()
dim db as DAO.database(), tbl as DAO.tableDef
dim strSQL as string, i as integer
set db = currentdb()
i = 1
for each tbl in db.TableDefs
if left(tbl.name, 1) = "5" then ' Check for a table name prefix
if i = 1 then
' The final spaces are important
strSQL = "select '" & tbl.Name & "' as table, count(qcpass) as column " & _
"from [" & tbl.Name & "] " & _
"group by qcpass "
else
' The final spaces are important
strSQL = strSQL & " union all " & _
"select '" & tbl.Name & "' as table, count(qcpass) as column " & _
"from [" & tbl.Name & "] " & _
"group by qcpass "
end if
i = i + 1
end if
next tbl
db.createQueryDef "qryYourFinalQuery", strSQL
db.close
exit sub
Notice that you can define any valid query you want. Take this as a hint, and tweak it to fit your specific needs.
Hope this helps you
Adressing #HansUp comment, if you need to filter your data by date, you have two options:
Include the where condition on every select created by the procedure
Include the date field in your query and group by it, and create a second query to filter the data you need from the created query.
I would personally go with option 1, and here is a sample code:
public sub createMyBigUnionQueryWithDates(d0 as date, d1 as date)
dim db as DAO.database(), tbl as DAO.tableDef
dim strSQL as string, i as integer
set db = currentdb()
i = 1
for each tbl in db.TableDefs
if left(tbl.name, 1) = "5" then ' Check for a table name prefix
if i = 1 then
' The final spaces are important
strSQL = "select '" & tbl.Name & "' as table, count(qcpass) as column " & _
"from [" & tbl.Name & "] " & _
"where rowDate between " & cDbl(d0) & " and " &cDbl(d1) & " " & _
"group by qcpass "
else
' The final spaces are important
strSQL = strSQL & " union all " & _
"select '" & tbl.Name & "' as table, count(qcpass) as column " & _
"from [" & tbl.Name & "] " & _
"where rowDate between " & cDbl(d0) & " and " &cDbl(d1) & " " & _
"group by qcpass "
end if
i = i + 1
end if
next tbl
db.createQueryDef "qryYourOtherFinalQuery", strSQL
db.close
exit sub
The reason I use cDbl(d0) is because Access dates are sensitive to regional settings, and I've had a lot of headaches dealing with it. Access (and many other Microsoft products) store dates as floating-point numbers (the integer part is the date, and the decimal part is the time).
Another word of warning: If your dates don't include time, then the between condition will work. But if they do include time, then I recommend you change the where condition to this:
"where rowDate >= " & cDbl(d0) & " and rowDate < " & cDbl(d1 + 1)"