How to loop retrieved results from table variable

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I have this

declare @Identity int
set @Identity = 100

declare @table1 as table (Id int)
insert into @table1 exec  [usp_GetIds] @Identity,2

declare @table2 as table (Id int)
insert into @table exec  [usp_GetIds] @Identity,1

Now i want to do logic based on each record filled in @table2 so , i need to loop

What I have tried:

So after inserting i want to do the following
let's say table2 retrieved this

Id  Name
--  ----
1   name1
2   name2
3   name3

I want to loop through each record retrieved and do this

while @table2 is not null  -- it seems i can't say while @table2
(
select count(Id)from @table1 where @table1.Id=@table2.Id 
--it seems i can't say @table1.field
exec usp_doSth(@table2.Id)
)

Posted 11-Aug-20 22:20pm

Member 14800672

Updated 12-Aug-20 3:44am

v4

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CHill60 12-Aug-20 4:29am

Do not loop!
SQL is SET based
Have a look at my article Processing Loops in SQL Server[^] - at the end it will tell you how to do loops in SQL Server - the rest of the article gives examples of why you usually don't need a loop and how to do that

Member 14800672 12-Aug-20 4:40am

how can i use the while with the table variable i created?

Jörgen Andersson 12-Aug-20 5:18am

You cannot, because it's a table variable.
It refers to a table, not a value, or even a row with values.
Now I suggest you read the article you were linked. It's good

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Richard Deeming · Answer 1 · 2020-08-12T03:44:00

As mentioned in the comments, you should always try to avoid loops in SQL code. But in this case, something like this should work:

SQL

WHILE Exists(SELECT 1 FROM @table2)
BEGIN
    DECLARE @Id int;
    SELECT TOP 1 @Id = Id FROM @table2 ORDER BY Id;
    EXEC ups_doSth @Id;
    DELETE FROM @table2 WHERE Id = @Id;
END;