How to select rows where multiple joined table values meet selection criteria?

Question

Given the following sample table schema

Customer Table

CustID
1
2
3

Invoice Table

CustID InvoiceID

1       10
1            


        

Answer 1

Use:

  SELECT c.custid
    FROM CUSTOMER c
    JOIN INVOICE i ON i.custid = c.custid
   WHERE i.invoiceid IN (10, 20)
GROUP BY c.custid
  HAVING COUNT(DISTINCT i.invoiceid) = 2

The key thing is that the counting of i.invoiceid needs to equal the number of arguments in the IN clause.

The use of COUNT(DISTINCT i.invoiceid) is in case there isn't a unique constraint on the combination of custid and invoiceid -- if there's no chance of duplicates you can omit the DISTINCT from the query:

  SELECT c.custid
    FROM CUSTOMER c
    JOIN INVOICE i ON i.custid = c.custid
   WHERE i.invoiceid IN (10, 20)
GROUP BY c.custid
  HAVING COUNT(i.invoiceid) = 2