SQL Server - script to update database columns from varchar to nvarchar if not already nvarchar

Question

I am in a situation where I must update an existing database structure from varchar to nvarchar using a script. Since this script is run everytime a configuration applicati

Answer 1

The following query should get you what you need:

IF EXISTS 
  (SELECT *
   FROM sysobjects syo
   JOIN syscolumns syc ON
     syc.id = syo.id
   JOIN systypes syt ON
     syt.xtype = syc.xtype
   WHERE 
     syt.name = 'nvarchar' AND
     syo.name = 'MY TABLE NAME' AND
     syc.name = 'MY COLUMN NAME')
BEGIN
   ALTER ...
END