Using @@ROWCOUNT and TABLE Variables for Database Interactions with Transact-SQL - Filling a TABLE variable with existing rows
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We are not allowed to use the SELECT..INTO statement to work with TABLE variables. To transfer the rows from a SELECT to a TABLE variable, the only option we have is to use INSERT with SELECT. The following is a sample script:
use northwind
set nocount on
go
declare @t_emp TABLE
(
ID int identity(1,1)primary key,
EmpID int unique,
Ename varchar(30) not null
)
insert into @t_emp(EmpID, Ename)
select EmployeeID, LastName + ' ' + FirstName
from Employees
select * from @t_emp
go
The most important statement of the above script is the following:
insert into @t_emp(EmpID, Ename)
select EmployeeID, LastName + ' ' + FirstName
from Employees
It clearly states that the output of the SELECT statement should be transferred to the table variable @t_emp. But while transferring we have to make sure that the number of columns along with data types should match.
In the next upcoming article, I shall concentrate more on tables, loops, cursors, and more. So, please check back frequently or sign up for a newsletter! Any bugs, errors, improvements etc., are highly appreciated at http://jagchat.spaces.live.com
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