Question

SQL novice here.

I’m trying to get a list of invoice numbers. There are two tables – invoices and invoicedetail. The invoicedetail table has a field called scanned (it’s a bit field). If it’s been scanned, then the bit field is 1.

For each invoice, there are associated records in the invoicedetail, but I only want a list of the invoice numbers where every associated record in invoicedetail’s scanned field is 1.

I’d rather do this in a single query if possible.

The records scanned in InvoiceDetail is all records – for any invoice number returned.

Your help is appreciated.

Answer 1

SELECT 
   InvoiceNumber 
FROM 
   Invoice 
INNER JOIN 
   InvoiceDetail 
ON 
   InvoiceDetail.ID = Invoice.ID 
WHERE 
   InvoiceDetail.ScannedColumn=1 
GROUP BY 
   Invoice.InvoiceNumber

Or…

SELECT
   DISTINCT
   InvoiceNumber
FROM
   Invoice it
INNER JOIN
   InvoiceDetail idt 
ON idt.ID = it.ID
WHERE
  idt.ScannedColumn=1

Just make sure you change the column names to fit your needs. Use your ID from each table for the joins and then use a WHERE to filter the records to just show those which are scanned. Being that you are using a bit field you will simply use WHERE ScannedColumn = 1.