Disable NULL in CASE WHEN condition

Question

I tried to run the script below, and it will display NULL value. I only want to get data for ALBANIA without having NULL value.

SELECT [COUNTRY_CODE_NEW]
      ,CASE WHEN SUBSTRING([COUNTRY_CODE_NEW], 6,2) = '16' THEN 'ALBANIA'
        END 'COUNTRY'
  FROM [dbo].[COUNTRY_NEW] 

Answer 1

你可以做：

CASE WHEN SUBSTRING([COUNTRY_CODE_NEW], 6,2) = '16' AND IS NOT NULL THEN 'ALBANIA'

Answer 2

Just add a check to ensure it's not null:

SELECT
    [COUNTRY_CODE_NEW],
    CASE WHEN SUBSTRING([COUNTRY_CODE_NEW], 6,2) = '16' AND [COUNTRY_CODE_NEW] IS NOT NULL THEN 'ALBANIA'
    END 'COUNTRY'
FROM [dbo].[COUNTRY_NEW]