Is it possible to encapsulate sql-select result?

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SQL-Server-2008R2

Simple SQL query:

SQL

(select e.lastName as Name, count(o.orderid) as numOrd from
Employees e join Orders o on e.employeeid=o.employeeid
group by e.lastName)

and result

VB

Buchanan    42
Callahan    104
Davolio     123
Dodsworth   43

My question is how to achieve in SQL something like that:

SQL

let queryResult = 
(select e.lastName as Name, count(o.orderid) as numOrd from
Employees e join Orders o on e.employeeid=o.employeeid
group by e.lastName)

and after that to write something like this, which will be the output:

SQL

select AVG(qr.numOrd) from queryResult qr

Is it possible without creating any new tables?

Posted 26-Apr-14 10:13am

Pavel Pavlov

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2 solutions

Solution 1

The way you ask for can't work in SQL. You have to options:
1. Declare a table variable and insert the results of the first select into it, than use it in the second select
2. Use the first select in the from part - select * from (select field from table)

Posted 26-Apr-14 10:25am

Kornfeld Eliyahu Peter

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Pavel Pavlov · Accepted Answer · 2014-06-24T21:58:00

Solution 2

The answer was CTE's
http://technet.microsoft.com/en-us/library/ms190766(v=sql.105).aspx[^]

Posted 24-Jun-14 21:58pm

Pavel Pavlov