How to generate ID with primary key ?

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SQL-Server-2008R2

Well I would like to add prefix to primary key using Computed Column Specifier.
I know there is a formula looks like SL+'_'+cast(id as varchar(20)) but this formula cannot be validated by SQL Server Management Studio.

Please help me to build this formula.

I dont prefer to use coding to generate id for now.

What I have tried:

Tried putting formula SL+'_'+cast(id as varchar(20)) in to Computed Column Specified but not validating due to wrong format..

Posted 19-Apr-18 3:16am

Babai JermenKeller Sasmal

Updated 19-Apr-18 6:26am

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Richard Deeming 19-Apr-18 15:49pm

Is SL a column in your table, or a literal prefix?

If it's a literal prefix, then it needs to be inside the string:

'SL_' + CAST(id As varchar(20))

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RickZeeland · Accepted Answer · 2018-04-19T06:27:00

Solution 1

You could use sequences for this, see articles here:
SQL SERVER 2012 – How to generate a varchar Sequence Number – Using Sequence Object | SQL Server Portal[^]
And: Flexible numbering sequences in T-SQL[^]
But sequences are only supported from SQL Server 2012 apparently ...

Posted 19-Apr-18 6:27am

RickZeeland

Updated 19-Apr-18 6:39am

v3

Comments

[no name] 19-Apr-18 14:55pm

+5 for mention the very flexible _sequences_

RickZeeland 19-Apr-18 14:59pm

Thanks :)