Compare two tables and insert all records with added or removed status in 3rd table using SQL Server procedure

Question

I have table A and table B . I have to compare this tables records and insert data to table C using SQL Server procedure in below format

table A

  name
          


        

Answer 1

You can do this with a full join and conditional logic:

select 
    coalesce(a.name, b.name) name,
    case
        when a.name is null then 'newly added'
        when b.name is null then 'removed'
    end status
from tablea a
full join tableb b on b.name = a.name
order by name

Demo on DB Fiddle:

name | status     
:--- | :----------
A    | null       
B    | null       
C    | null       
D    | null       
E    | removed    
F    | null       
G    | null       
Q    | newly added