How to increment my id filed starting with a alphabet in SQL

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I have a identity filed OrderNo in my table Orders the datatype in nvarchar
I have the orderNo 20000, T20000
How to autoincrement with MAX function i need 20001 or T20001

What I have tried:

select 'T' + CONVERT(VARCHAR(10),max(OrderNo)+1)AS OrderNo  from tblOrderMaster

Posted 31-Aug-18 23:16pm

Member 13569764

Updated 2-Sep-18 22:36pm

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CHill60 · Answer 1 · 2018-09-02T22:30:00

If you want to persist the OrderNumber with the 'T' preceding it in your database then you will need a separate column to store it in (this is why you are getting your "I am getting error like this "Conversion failed when converting the nvarchar value 'T20001' to data type int" error).

You have already stated that OrderNo is an Identity field so there is no need to use MAX() - in fact you should never use that as a method for generating a "unique" id (there is no guarantee it will be unique in a multi-user database).

To get your order number with the preceding "T" just use

SQL

select 'T' + CAST(OrderNo AS VARCHAR) AS OrderNoWithPrefix from tblOrderMaster

To be honest there is no need to persist this value on the database as it appears to be a display only feature - just add the T when you need it.

Peter Leow · Answer 2 · 2018-09-02T22:36:00

Solution 4

Check this out: Ask Your Database for that Unique ID[^]

Posted 2-Sep-18 22:36pm

Peter Leow

M4rLask · Answer 3 · 2018-09-01T08:16:00

Solution 1

SQL

select 'T' + CONVERT(VARCHAR, MAX(OrderNo)+1, 103) AS OrderNo from tblOrderMaster

Posted 1-Sep-18 8:16am

M4rLask

Comments

Member 13569764 2-Sep-18 3:36am

I am getting error like this "Conversion failed when converting the nvarchar value 'T20001' to data type int"

User-10689749 · Answer 4 · 2018-09-02T20:54:00

Solution 2

select 'T' + CONVERT(VARCHAR(10),max(OrderNo)+1)AS OrderNo  from (SELECT REPLACE(OrderNo,'T','')AS OrderNo from @tblOrderMaster) Final

Posted 2-Sep-18 20:54pm

User-10689749