SQL server use "IF variable LIKE pattern"

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Why this doesn't work?

DECLARE @str varchar = '######'

IF @str LIKE '%###%' SELECT 1

but this works

IF '######' LIKE '%###%' SELECT 1

UPDATE

why this works

DECLARE @Comment varchar(255) = '[A-B-C-D]'

IF @Comment LIKE '%[%-%-%-%]%' SELECT 1

however this doesn't work?

DECLARE @Comment nvarchar(255) = '[A-B-C-D]'

IF @Comment LIKE '%[%-%-%-%]%' SELECT 1

Add to your variable type length.

DECLARE @str varchar = '######'

IF @str LIKE '%###%' SELECT 1

is the same as (implicit cast will change it to '#')

DECLARE @str varchar(1) = '######'

/* IF '#' LIKE '%###%' SELECT 1 */
IF @str LIKE '%###%' SELECT 1

This will work:

DECLARE @str varchar(20) = '######'

IF @str LIKE '%###%' SELECT 1

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try declaring the size of your varchar

DECLARE @str varchar(50) = '######'

SELECT 1 WHERE  @str LIKE '%###%'

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If you don't use specify type length, it will use mimimum code page length.This contants, varchar 1 and nvarchar 2. So, actually if scope is working normaly.

DECLARE @str varchar = '######'
SELECT  DATALENGTH(@str) 

DECLARE @str1 varchar(20) = '######'
select DATALENGTH(@str1) 

DECLARE @str3 nvarchar = '######'
SELECT  DATALENGTH(@str3) 

DECLARE @str4 nvarchar(20) = '######'
select DATALENGTH(@str4) 

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