After copying records from a Char column to a Varchar column, I'm unable to find the row using like statement in SQL Server 2014 but fine in 2003

Question

After copying records from a Char column to a Varchar column, I'm unable to find the row using like statement

Create database testDB
Go

USE [testDB]
GO

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[TestTable1]
(
    [Col_char] [char](20) NULL,
    [Col_nchar] [nchar](64) NULL,
    [Col_varchar] [varchar](64) NULL,
    [Col_nvarchar] [nvarchar](64) NULL
) ON [PRIMARY]
GO

SET ANSI_PADDING OFF
GO

insert into TestTable1 values ('Sumit1%', 'Sumit1%', 'Sumit1%', 'Sumit1%')
insert into TestTable1 values ('Sumit2*', 'Sumit2*', null, 'Sumit2*')

select 
    [Col_char], LEN([Col_char]),
    [Col_nchar], LEN([Col_nchar]),
    [Col_varchar], LEN([Col_varchar]),
    [Col_nvarchar], LEN([Col_nvarchar]) 
from 
    TestTable1

This line is giving me the search result

select * 
from TestTable1 
where 'sumit1' like [Col_varchar]

Now I am replacing * with % & copying [Col_char] to [Col_varchar] column

update TestTable1 
set [Col_varchar] = Replace([Col_char], '*', '%')
where [Col_char] like '%2%'

select * from TestTable1

select * from TestTable1 where 'sumit1' like [Col_varchar]

-- this line is not showing any results 
select * from TestTable1 where 'sumit2' like [Col_varchar]

select 
    Len(Replace([Col_char], '*', '%')),
    Len(Replace([Col_varchar], '*', '%')), * 
from TestTable1 

Answer 1

When you have SET ANSI_PADDING ON a CHAR(20) will always be 20 characters by padding the right side with spaces.

When you convert that to varchar you still have 20 characters so your Col_varchar value is actually "Sumit2% " so you're looking for a string that starts with Sumit2 but also has a bunch of spaces at the end

if you replace the value using

UPDATE
    TestTable1
SET 
    [Col_varchar] = RTRIM(REPLACE([Col_char],'*','%'))
WHERE
    [Col_char] LIKE '%2%'

it should work for you.

Info on ANSI_PADDING https://msdn.microsoft.com/en-us/library/ms187403.aspx