Querying a Partitioned Table in SQL SERVER

1. Querying the data from a particular partition

The Syntax is as follows

SELECT < Column Name1 >…/* FROM < Table Name > WHERE $PARTITION.< Partition Function Name >(< Column Name >) = < Partition Number >

The Partition number refers to first partition range or second partition range and so on, The first partition range is referred as 1 , second as 2 and so on.

The below examples returns all the records in the partition 1.

SELECT * FROM EMP WHERE $PARTITION.EmployeePartitionLeft (EMPLOYEEID) = 1

2. Querying for Knowing the Partition Number

The syntax is as follows

SELECT $PARTITION.< Partition Function Name >(< Column Name >) = < Partition Range Value >

The below example returns 2 as the partition number for partition range >1 and less than equal to 100.

SELECT $PARTITION.EmployeePartitionLeft(100)

3. Querying to find the count of records in each partition

The syntax is as follows

SELECT $PARTITION.< Partition Function Name >(< Column Name >), COUNT(*) FROM < Table Name > GROUP BY $PARTITION.< Partition Function Name >(< Column Name >)

The below example returns the number of records in each partitions.

SELECT $PARTITION.EmployeePartitionLeft (EMPLOYEEID) AS Partition, COUNT(*) AS [COUNT] FROM EMPLOYEE GROUP BY $PARTITION.EmployeePartitionLeft (EMPLOYEEID) ORDER BY Partition ;

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