Question

I have two tables

MD_Master  (Medical checks)
Id
...

CD_Personal (Personal Checks)
Id
...

Each fieldname in both tables are different names, types, and data.

However, each has a Primary Key Id, and can potentially conflict with eath other.

i.e. Id 101 can exist in both MD_Master and CD_Personal

I would like to create a view combing both tables (combining MD_Medical and CD_Personal Id fields) but I don’t know how to handle the Ids.

I would like the view to have a Numeric(19,0) for Id.

Would it be possible to select and do a union of these two diffeent tables and create a unique ID?

Thanks

Answer 1

You can try something like this:

declare @medical table(id int, checks varchar(10))

declare @personal table(id int, checks varchar(10))

insert into @medical 
select 1, 'abc1'
union
select 2, 'abc2'

insert into @personal
select 1, 'abc1'
union
select 2, 'abc22'

;WITH CTE AS (
select *, 'M' As Src from @medical 
union
select *, 'P' As Src from @personal
)

SELECT checks, src, ROW_NUMBER() over (order by checks, id) new_id FROM CTE

In your case:

SELECT checks, src, ROW_NUMBER() over (order by [checks], id) new_id 
FROM 
(

SELECT id, [Medical checks] Checks, 'M' as Src FROM MD_Master
UNION ALL
SELECT id, [Personal checks] Checks, 'P' as Src FROM CD_Personal

)