creating dynamic columns of a table according to user input via stored procedure

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I want to create a table with dynamic columns i.e. number of columns to be defined by
user using STORED PROCEDURE.

Let me clarify my requirement, I need to create a table (dyn_tbl) via SP whose inputs will be "number of fields".

e.g.
----------------------------------------------------------------

SQL

CREATE OR REPLACE PROCEDURE dynamic_tbl (num_fields varchar2)
AS

num_fields varchar2(25);

BEGIN

END;
/

----------------------------------------------------------------
If user inputs num_fields = 3, o/p will be;

SQL

create table dyn_tbl
(
col_1 varchar2(20);
col_2 varchar2(20);
col_3 varchar2(20);
);

*********

If user inputs num_fields = 5, o/p will be;

SQL

create table dyn_tbl
(
col_1 varchar2(20);
col_2 varchar2(20);
col_3 varchar2(20);
col_4 varchar2(20);
col_5 varchar2(20);
);

************************************************

Here the column name differ only by there last character which is based on user
requirement.

How can I do it?

Posted 19-Aug-13 23:05pm

nischalinn

Updated 18-May-18 21:46pm

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Sadique KT · Answer 1 · 2013-08-19T23:52:00

SQL

CREATE PROCEDURE dynamic_tbl
@ColumnCount int=0
AS 
BEGIN
	Declare @ColumnName nvarchar(10)='col_'
	Declare @count int =1
	IF(@ColumnCount>0)
	BEGIN
		IF (EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'dbo' AND  TABLE_NAME = 'dyn_tbl'))
		BEGIN
			
			DROP TABLE dyn_tbl
		END
		CREATE TABLE [dbo].[dyn_tbl]
		(	col_1 varchar(20)	)
		SET @count=@count +1;
		WHile(@ColumnCount>=@count) 
		BEGIN
			SET @ColumnName='col_'+CONVERT(varchar(2),@count)
			EXEC ('ALTER TABLE dyn_tbl ADD ['+@ColumnName +'] varchar(20)')
			SET @count=@count +1;
		END
	END
END