Best way to get the last autonumber from a table

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SQL-Server-2008

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1. Suppose I have a table in MS SQL Server database that has an autonumber column (identity column). Let's call the table 'Sales' and identity column 'SaleID'.

2. Then I have a StoredProcedure which inserts the total sale amount, triggering SaleID to generate (cause SaleID is identity) and returns the SaleID generated to the app so it can be used further ahead.

3. Finally, suppose this is all for a web application (ASP.Net) where a lot of users simultaneously can trigger a sale.

If my Stored Procedure code is...

SQL

--@HypotheticalSalesTotal comes from the SP's parameters

declare @SaleID INT

INSERT INTO dbo.Sales (SaleDate, Total) VALUES (GETDATE(), @HypotheticalSalesTotal)

SELECT @SaleID = MAX(SaleID)
FROM dbo.Sales

...Is this a way to safely obtain the SaleID that corresponds to this sale?
Given the amount of simultaneous buyers at the web app, is there any chance the SaleIDs could cross?

Or does MS SQL Server safely runs StoredProcedures one by one in queue?

Thank you very much!

Posted 3-Oct-13 17:58pm

Homero Rivera

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PIEBALDconsult · Accepted Answer · 2013-10-03T18:12:00

Solution 1

No, it is not.

SCOPE_IDENTITY[^]

(But I never use identity columns. They cause too much trouble.)

Posted 3-Oct-13 18:12pm

PIEBALDconsult

Updated 4-Oct-13 2:16am

v2

Comments

Homero Rivera 4-Oct-13 17:09pm

Looks like the best option. I'll take as answer as soon as I can test it, please be patient.

Ranesh M Raj · Accepted Answer · 2013-10-03T18:13:00

Solution 2

SELECT id FROM table ORDER BY id DESC LIMIT 1

or

SELECT LAST_INSERT_ID()

Posted 3-Oct-13 18:13pm

Ranesh M Raj

Comments

Homero Rivera 4-Oct-13 17:10pm

Looks good, only this works for MySQL not for MS SQL Server. Could you improve your answer stating this is for MySQL; I'll be glad to accept as solution as soon as that is stated.

Ranesh M Raj 5-Oct-13 0:24am

SElECT IDENT_CURRENT('tablename') in Ms Sql