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Create Table #ids( TableName sysname, id int) Insert Into b (b_desc) Values ('1') Insert Into a (a_desc, b_desc) Values ('aaa', 'bbb') -- right identity value Select id [IdentityValue] From #ids Where TableName = 'a' Drop Table #ids

This time, the result is correct:

IdentityValue ------------1

TIP: I do not like either of these solutions. The sequence table is an archaic approach. It requires many manual steps, and the performance of the database will suffer because of concurrency problems. I find the second solution even more distasteful. The trigger is coupled with the code that is calling it. It depends on the existence of a temporary table. The developer might forget to create the trigger, or the user might try to insert records with some other tool. Too many things can go wrong. Let s keep this problem in mind and solve it by avoiding such triggers!

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Distributed environments have different requirements for the generation of unique keys. A typical example is a database of sales representatives who are carrying notebook computers with local databases installed on them. These users do not have to be connected to a central database. They do the majority of their work locally and then replicate the information in their local database to the central database once in awhile. The use of identity fields in this case will lead to repetition, unless the key is composite and consists of an identity field and another field that is unique to the user. Another solution could be to divide key ranges between users (for example by setting an identity seed differently in each database). Each of these solutions has different limitations. One way to generate unique keys is to use GUID (Global Unique Identification) fields. We discussed the uniqueidentifier datatype in 4. When a column in a table is assigned this datatype, it does not mean that its (unique) value will be generated automatically. Some other database object needs to generate a unique value using the NewID() function. Typically a GUID value is generated as a default value of a table:

Create Table Location( LocationId uniqueidentifier NOT NULL DEFAULT newid(), Location varchar(50) not null, CompanyId int NOT NULL, PrimaryContactName varchar(60) NOT NULL, Address varchar(30) NOT NULL, City varchar(30) NOT NULL, ProvinceId varchar(3) NULL, PostalCode varchar(10) NOT NULL, Country varchar(20) NOT NULL, Phone varchar(15) NOT NULL, Fax varchar(15) NULL ) Go

If the identifier does not comply with one of the previous rules, it is referred to as a delimited identifier, and it must be delimited by double quotes (" ") or square brackets ( [ ] ) when referenced in T-SQL statements. You can change the default behavior if you use the Set Quoted_Identifier Off statement. The role of single and double quotes will be reversed. Single quotes will delimit identifiers, and double quotes will delimit strings. As an interim migration aid, you can specify the compatibility mode in which SQL Server will run using the system stored procedure sp_dbcmptlevel. Changing the compatibility mode will affect the way in which SQL Server interprets identifiers. You should check Books Online for more information if you are running in any compatibility mode other than 80.

10:

You can also generate it in a stored procedure:

Create Procedure prInsertLocation @Location varchar(50), @CompanyId int, @PrimaryContactName varchar(60), @Address varchar(30) , @City varchar(30) , @ProvinceId varchar(3) , @PostalCode varchar(10), @Country varchar(20) , @Phone varchar(15), @Fax varchar(15), @LocationGUID uniqueidentifier OUTPUT AS Set @LocationGUID = NewId()

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