Question

Hi I am stuck here need your advice. I have a server with multiple DB’s.
Now I want to map if the data in one table of 1 db is equal to the data in another db with same table name

can anyone suggest how to do that?? thanks in advancve

Answer 1

depends on what you need to map.
If you just want to know the differences by primary key, I would try a full join on the PK, so it will tell you records that exist on A but not on B and records that exists on B but not on A. Like this:

create table DB_A(id int)
create table DB_B(id int)

insert into DB_A values (1)
insert into DB_A values (2)

insert into DB_B values (2)
insert into DB_B values (3)

select DB_A.ID as 'Exists on A but not on B', DB_B.id as  'Exists on B but not on A'
from DB_A full join DB_B on DB_A.id=DB_B.id 
where DB_A.id is null or DB_B.id is null  

if you need more than that like compare the values of all columns, I suggest you to use a data compare tool. It would not be so strait forward to do it using just SQL