Cannot insert the value NULL into column where using Sql Select statement

Question

Can you tell me how to avoid below mentioned exception ?

 INSERT INTO [Migrated].[dbo].[Cities] (Name, ZipCode)
     SELECT DISTINCT 
         a.City, a.ZipCode          


        

Answer 1

Simply add the column to insert list and fixed value to select list.

INSERT INTO [Migrated].[dbo].[Cities] (Name, ZipCode, IsDeleted)
select  DISTINCT a.City,a.ZipCode, 0 IsDeleted --0 means false
  from [Legacy].[dbo].[Ziplist] as a 
    where (a.City is not null and a.ZipCode is not null);