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Developer-C 11.1
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CREATE TABLE tablename ([CustomerID] int, [Group] int); INSERT INTO tablename ([CustomerID], [Group]) VALUES (1, 1), (3, 1), (6, 1), (4, 2), (7, 2);
5 rows affected
declare @c int = (select max([CustomerID]) from tablename); declare @g int = (select max([Group]) from tablename); with customers as ( select 1 as cust union all select cust + 1 from customers where cust < @c ), groups as ( select 1 as gr union all select gr + 1 from groups where gr < @g ), cte as ( select * from customers cross join groups ) select c.cust as [CustomerID], c.gr as [Group] from cte c left join tablename t on t.[CustomerID] = c.cust and t.[Group] = c.gr where t.[CustomerID] is null and c.cust > (select min([CustomerID]) from tablename where [Group] = c.gr) and c.cust < (select max([CustomerID]) from tablename where [Group] = c.gr)
CustomerID
Group
2
1
4
1
5
1
5
2
6
2