Question

I have a question about inserting column stored procedure into table.
I have two tables about 100 rows and 1 Mil rows.
Basically, I have a function that returns int comparing two data from different table.
And I want to run function on each combination of data.

Table 1 (~100 rows)

Col1                
A                   
B                   
C                   
D  

Table 2 (~1 Mil rows)

Col1  
1  
2  
3  
4  

function(i,j) where i is from table 1 and j is from table 2
Code in nutshell is like:

while i < count(*) table 1  
   print i  
   while j < count(*) table 2  
   select function(i,J)  
   J = J + 1  
   end  
i = i + 1  
j = 0  
end  

The result display is a long single column with i (from table1) and int evaluated from function.

i(1)  
1  
3  
4  
.  
.  
.  
i(2)  
1  
2  
.  
.  

I want to display the above result like table dynamically assign column name to i.

i(1)        i(2)        i(3) .....  
1           1           5  
3           2           9  
4           3           4  

Thanks in advance.

Answer 1

This would be my solution:

DECLARE @columns VARCHAR(MAX)

SELECT @columns = COALESCE(@columns + ',[' + CAST(t1.i as varchar(10)) + ']'
                           ,'[' + CAST(t1.i as varchar(10)) + ']')
FROM t1

DECLARE @query VARCHAR(MAX)
SET @query = '
    SELECT * FROM
    (
        SELECT t1.i, t2.j, yourFunction(t1.i, t2.j) as functionResult
        FROM t1
        CROSS JOIN t2
    ) as tbl3
    PIVOT
    (
        SUM(functionResult) FOR i in (' + @columns + ')
    ) AS tblResults'

EXECUTE (@query)​

You can check out a working example of this here on SEDE.

Edit

And just for clarification, you would replace t1 and t2 with the actual names of your 2 tables. Also in the SEDE example I just added i and j together (t1.i + t2.j as functionResult) because I can’t create functions on there, but you would just call your function instead like I show in my answer (yourFunction(t1.i, t2.j) as functionResult).