how to select columns by column index in sql? [duplicate] - sql

Question

Is there a way to access columns by their index within a stored procedure in SQL Server?
The purpose is to compute lots of columns. I was reading about cursors, but I do not know how to apply them.
Let me explain my problem:
I have a row like:
field_1 field_2 field_3 field_4 ...field_d Sfield_1 Sfield_2 Sfield_3...Sfield_n
1 2 3 4 d 10 20 30 n
I need to compute something like (field_1*field1) - (Sfield_1* Sfiled_1) / more...
So the result is stored in a table column d times.
So the result is a d column * d row table.
As the number of columns is variable, I was considering making dynamic SQL, getting the names of columns in a string and splitting the ones I need, but this approach makes the problem harder. I thought getting the column number by index could make life easier.

Answer 1

No, you can not use the ordinal (numeric) position in the SELECT clause.
Only in the ORDER BY clause can you use the ordinal position, because it's based on the column(s) specified in the SELECT clause.

Answer 2

First, as OMG Ponies stated, you cannot reference columns by their ordinal position. This is not an accident. The SQL specification is not built for dynamic schema either in DDL or DML.
Given that, I have to wonder why you have your data structured as you do. A sign of a mismatch between schema and the problem domain rears itself when you try to extract information. When queries are incredibly cumbersome to write, it is an indication that the schema does not properly model the domain for which it was designed.
However, be that as it may, given what you have told us, an alternate solution would be something like the following: (I'm assuming that field_1*field1 was meant to be field_1 * field_1 or field_1 squared or Power( field_1, 2 ) )
Select 1 As Sequence, field_1 As [Field], Sfield_1 As [SField], Sfiled_1 As [SFiled]
Union All Select 2, field_2, Sfield_2, Sfiled_2
...
Union All Select n, field_n, Sfield_n, Sfiled_n
Now your query looks like:
With Inputs As
(
Select 1 As Sequence, field_1 As [Field], Sfield_1 As [SField], Sfiled_1 As [SFiled]
Union All Select 2, field_2, Sfield_2, Sfiled_2
....
)
, Results As
(
Select Case
When Sequence = 1 Then Power( [Field], 2 ) - ( [SField] * [SFiled] )
Else 1 / Power( [Field], 2 ) - ( [SField] * [SFiled] )
End
As Result
From Inputs
)
Select Exp( Sum( Log( Result ) ) )
From Results

Answer 3

This might not be the most elegant or efficient but it works. I am using it to create a new table for faster mappings between data that I need to parse through all the columns / rows.
DECLARE #sqlCommand varchar(1000)
DECLARE #columnNames TABLE (colName varchar(64), colIndex int)
DECLARE #TableName varchar(64) = 'YOURTABLE' --Table Name
DECLARE #rowNumber int = 2 -- y axis
DECLARE #colNumber int = 24 -- x axis
DECLARE #myColumnToOrderBy varchar(64) = 'ID' --use primary key
--Store column names in a temp table
INSERT INTO #columnNames (colName, colIndex)
SELECT COL.name AS ColumnName, ROW_NUMBER() OVER (ORDER BY (SELECT 1))
FROM sys.tables AS TAB
INNER JOIN sys.columns AS COL ON COL.object_id = TAB.object_id
WHERE TAB.name = #TableName
ORDER BY COL.column_id;
DECLARE #colName varchar(64)
SELECT #colName = colName FROM #columnNames WHERE colIndex = #colNumber
--Create Dynamic Query to retrieve the x,y coordinates from table
SET #sqlCommand = 'SELECT ' + #colName + ' FROM (SELECT ' + #colName + ', ROW_NUMBER() OVER (ORDER BY ' + #myColumnToOrderBy+ ') AS RowNum FROM ' + #tableName + ') t2 WHERE RowNum = ' + CAST(#rowNumber AS varchar(5))
EXEC(#sqlCommand)