How to join dynamic sql statement in variable with normal statement - sql

Question

I have a quite complicated query which will by built up dynamically and is saved in a variable.
As second part i have another normal query and i'd like to make an inner join between these both.
To make it a little more easier here is a little example to illustrate my problem.
For this little example i used the AdventureWorks database.
Some query built up dynamically
(Yes, i know there is nothing dynamic here, cause it's just an example.)
DECLARE #query AS varchar(max) ;
set #query = '
select
HumanResources.Employee.EmployeeID
,HumanResources.Employee.LoginID
,HumanResources.Employee.Title
,HumanResources.EmployeeAddress.AddressID
from
HumanResources.Employee
inner join HumanResources.EmployeeAddress
on HumanResources.Employee.EmployeeID = HumanResources.EmployeeAddress.EmployeeID
;';
EXEC (#query);
The normal query i have
select
Person.Address.AddressID
,Person.Address.City
from
Person.Address
Maybe what i'd like to have but doesn't work
select
#query.*
,Addresses.City
from
#query as Employees
inner join
(
select
Person.Address.AddressID
,Person.Address.City
from
Person.Address
) as Addresses
on Employees.AddressID = Addresses.AddressID

Answer 1

Use temp tables & have the records dumped into it (from the dynamic query) & use the temp table to join with the static query that you have.
set #query = 'CREATE table #myTempTable AS
select
HumanResources.Employee.EmployeeID
,HumanResources.Employee.LoginID
,HumanResources.Employee.Title
,HumanResources.EmployeeAddress.AddressID
from
HumanResources.Employee
inner join HumanResources.EmployeeAddress
on HumanResources.Employee.EmployeeID = HumanResources.EmployeeAddress.EmployeeID
;';
EXEC (#query);
And then
select
Employees.*
,Addresses.City
from
#myTempTable as Employees
inner join
(
select
Person.Address.AddressID
,Person.Address.City
from
Person.Address
) as Addresses
on Employees.AddressID = Addresses.AddressID

Answer 2

You might be on the right track, but as long as you trust the source of the parameter and not exposed for SQL-Injection, you might just have to alter your select when building your #query like:
parameter to your function '#YourAlternateTableParm'
DECLARE #query AS varchar(max) ;
set #query = 'select ' + #YourAlternateTableParm
+ '.*, Addresses.City
from ' + #YourAlternateTableParm
+ ' as Employees
inner join
( ..... '
This way, like you were building your original string, you are building the actual value of the parameter to a function/procedure call with the table name desired to represent your "Employees" file into the string, then you execute that. SQL is not dynamically interpretting the #query inline the way you were trying to do.