Which Transact-SQL statement should you use?

You administer a database that includes a table named Customers that contains more than 750
rows. You create a new column named PartitionNumber of the int type in the table.
You need to assign a PartitionNumber for each record in the Customers table.You also need to
ensure that the PartitionNumber satisfies the following conditions:
Always starts with 1.
Starts again from 1 after it reaches 100.
Which Transact-SQL statement should you use?

You administer a database that includes a table named Customers that contains more than 750
rows. You create a new column named PartitionNumber of the int type in the table.
You need to assign a PartitionNumber for each record in the Customers table.You also need to
ensure that the PartitionNumber satisfies the following conditions:
Always starts with 1.
Starts again from 1 after it reaches 100.
Which Transact-SQL statement should you use?

A.
CREATE SEQUENCE CustomerSequence AS int
START WITH 0
INCREMENT BY 1
MINVALUE 1
MAXVALUE 100
UPDATE Customers SET PartitionNumber = NEXT VALUE FOR CustomerSequence
DROP SEQUENCE CustomerSequence

B.
CREATE SEQUENCE CustomerSequence AS int
START WITH 1
INCREMENT BY 1
MINVALUE 1
MAXVALUE 100
CYCLE
UPDATE Customers SET PartitionNumber = NEXT VALUE FOR CustomerSequence
DROP SEQUENCE CustomerSequence

C.
CREATE SEQUENCE CustomerSequence AS int
START WITH 1
INCREMENT BY 1
MINVALUE 1
MAXVALUE 100
UPDATE Customers SET PartitionNumber = NEXT VALUE FOR CustomerSequence + 1
DROP SEQUENCE CustomerSequence

D.
CREATE SEQUENCE CustomerSequence AS int
START WITH 1
INCREMENT BY 1
MINVALUE 0
MAXVALUE 100
CYCLE
UPTATE Customers SET PartitionNumber = NEXT VALUE FOR CustomerSequence
DROP SEQUENCE CustomerSequence

Explanation:
http://msdn.microsoft.com/en-us/library/ff878091.aspx



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Marcin

Marcin

declare @v int=0
UPDATE Customers SET @v=PartitionNumber=iif(@v=100,1,@v+1)