Question

How to create table with a column computed by another table in SQL Server?

For example:

TableA:

    Name   SerialNoStart  SerialNoEnd
    A        1              3
    B        2              4
    C        1              1

I want create a new table with serial number between SerialNoEnd and SerialNoStart

The new table as following:

TableB:

   Name    SerialNo
   A          1
   A          2
   A          3
   B          2
   B          3
   B          4
   C          1

How to make it? Thanks!

Answer 1

You can split the data out using a recursive CTE, similar to this:

;with data(name, SerialNoStart, SerialNoEnd) as
(
    select name, SerialNoStart, SerialNoEnd
    from TableA
    union all
    select name, SerialNoStart +1, SerialNoEnd
    from data
    where SerialNoStart +1 <= SerialNoEnd
)
select name, SerialNoStart as SerialNo
from data
order by name

See SQL Fiddle with Demo