Merging data in a single SQL table without a Cursor

Question

I have a table with an ID column and another column with a number. One ID can have multiple numbers. For example

ID | Number
 1 |  25
 1 |  26
 1 |  30
 1 |  24
         


        

Answer 1

I'd suggest using a WHILE loop structure with a table variable instead of the cursor.

For example,

DECLARE @TableVariable TABLE
(
    MyID int IDENTITY (1, 1) PRIMARY KEY NOT NULL,
    [ID] int,
    [Number] int
)

DECLARE @Count int, @Max int

INSERT INTO @TableVariable (ID, Number)
SELECT ID, Number
FROM YourSourceTable

SELECT @Count = 1, @Max = MAX(MyID)
FROM @TableVariable

WHILE @Count <= @Max
BEGIN

    ...do your processing here...


    SET @Count = @Count + 1

END