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Allocate 0 or 1

Allocate 0 or 1

Allocate 0 or 1

Good Morning All,

Test Table

Booking Ref No:  Booking Ref No 1
L01              1
L01              0
L01              0
L02              1
L03              1
L04              1
L05              1
L04              0

Can anyone kindly assit me on this. I have column on one of my tables with duplicate booking ref no. I need to create a new column which will allocate 1 or 0 to that booking ref. 1 if it's a unique booking ref no: and 0 if that booking ref no: is a duplicate.

Thanks in advance  
Replies continue below

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RE: Allocate 0 or 1


insert into [SandBox].[dbo].[UniqueBookingRef]
        WHEN count([ref]) > 0 THEN 0
        ELSE 1
from [SandBox].[dbo].[UniqueBookingRef]
WHERE ref = 'L01'

The first time you enter L01, you will get 1, any new attempts will get 0

RE: Allocate 0 or 1

thanks for your reply, is there way that i can do this without inserting into a new table?

RE: Allocate 0 or 1

It's logical to decide that 0 or 1 value at inserting, but it doesn't really matter.

Essentially this is the most important part:

        WHEN count([ref]) > 0 THEN 0
        ELSE 1
from [SandBox].[dbo].[UniqueBookingRef]
WHERE ref = 'L01'

That's the logic that determines if it's unique or not.

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