Skip to main content

Paging in SQL server 2012 stored procedure using OFFSET and FETCH

In this article we will learn about pagination using OFFSET and FETCH, OFFSET and FETCH is the new features of SQL Server 2012. In earlier version this feature is not available so was very difficult to implement paging in our procedures it also kill procedures performance.

Pagination is very easy in SQL Server 2012. New feature of SQL Server 2012(OFFSET and FETCH) is described below.

OFFSET: OFFSET skips the specific number of rows. The number can be zero or greater than zero.

FETCH: FETCH returns specific number of rows after processing the OFFSET clause. The number can be one or greater than one.

OFSET Syntax:


OFFSET { integer_constant | offset_row_count_expression } { ROW | ROWS }


FETCH Syntax:


FETCH { FIRST|NEXT } <rowcount expression> { ROW|ROWS } ONLY


Limitation of OFFSET and FETCH:
  1. If you are using OFFSET and FETCH, it’s mandatory to use ORDER BY clause.
  2. OFFSET is mandatory if you are using FETCH.
  3. In query expression you can’t use TOP with OFFSET and FETCH.
  4. You can’t use COUNT(*) in query expression with OFFSET and FETCH.


Example: Suppose we have a table “Inventory” which has some basic data and we want to apply pagination when fetching the records of inventory in our procedure.

Run the following query to create “Inventory” table with some dummy records.


CREATE TABLE Inventory(
       ID BIGINT IDENTITY(1,1) PRIMARY KEY
       ,Title VARCHAR(500)
       ,SKU VARCHAR(20)
       ,Price DECIMAL(18,2)
       ,Created_Date DATETIME
       ,Updated_Date DATETIME
)

DECLARE @cnt INT=1000
WHILE(@cnt>0)
BEGIN
       INSERT INTO Inventory(Title,SKU,Price,Created_Date,Updated_Date)
       SELECT 'Title'+CONVERT(VARCHAR(5),@cnt),'SKU'++CONVERT(VARCHAR(5),@cnt),
       10+@cnt,GETDATE(),GETDATE()
       SET @cnt=@cnt-1
END


Now see the following script which is implemented with pagination.


-- =============================================
-- Author:                     Dilip Kumar SIngh
-- Create date: 04,Aug 2016
-- Description: 
-- =============================================
CREATE PROCEDURE usp_GetInventory
            @Index INT=0,
            @PageSize INT= 20
AS
BEGIN 
            SET NOCOUNT ON;
            SELECT ID,Title,SKU,Price,Created_Date
            FROM Inventory ORDER BY ID ASC
            OFFSET (@PageSize)*(@Index) ROWS --Offset to skip specific number of rows
            FETCH NEXT @PageSize ROWS ONLY   --fetch to fetch specific number of rows
            SET NOCOUNT OFF;
END
GO


Now execute the procedure to passing variable @Index and @Page it will fetch records accordingly.
Suppose I want to get 10 records for page index 1 then I will execute procedure as below.

EXEC usp_GetInventory @index=0,@PageSize=10


Result:

Note: in @Index you will pass the grid index value which should be started from zero, so you will pass value like @index=grid_ index-1, if index value is 1, 2,3,4,5 … or if you want to pass index value as same from 1 then change the procedure for OFFSET as OFFSET @PageSize*(@Index-1). In @pageSize you will pass the value to display number of records in grid.

Popular posts from this blog

Query to find stored procedures by nested stored procedure name

Problem: Suppose we have a stored procedure which has been used in several stored procedure, I mean stored procedure usp_proc1 is nested in many stored procedures like below
BEGIN DECLARE@ResultTABLE ( IDINT, NAMEVARCHAR(50), [ADDRESS]VARCHAR(255) ) INSERTINTO@Result EXECusp_proc1@Name='codefari' END
So I want to find all those queries who containing usp_proc1
Solution: There is a lot of solutions, I'm giving some of them below. If you want to get the only name of the stored procedures then use the following query. Using join query on system tables syscomments and sysobjects we can get the stored procedures name which containing the particular table, nested procs or any other string.
SELECTDISTINCTo.name FROMsyscommentss INNERJOINsysobjectsoONs.id=o.id

Check for changes to an SQL Server table?

Problem: Suppose your team is working on the under-development project so it might be possible continuous work on the database and perform changes in Table, Stored procedure as per requirement, and daily you have to update the testing server database as per changes are done in developing server database then how it is possible to trace those changes. There are a lot of solutions for this problem which is listed below Solution 1: For SQL Server 2000, 2005 and above use the CHECKSUM command SELECTCHECKSUM_AGG(BINARY_CHECKSUM(*))FROMYour_Table_NameWITH (NOLOCK); That will return the same number each time its run as long as the table contents haven't changed. Unfortunately CHECKSUM does not work always properly to detect changes. It is only a primitive checksum and no CRC calculation. Therefore you can't use it to detect all changes, e. g. symmetrical changes result in the same CHECKSUM! Solution 2: 1.Run the following query. Before executing query replace DB_Name with your database name…

Merge and Merge join transformation in SSIS

MERGE TRANSFORMATION
Using Merge Transformation we can combine two sorted data-set into single data-set basically Merge Transformation used to combines rows from two sorted data flows into one sorted data flow. Following tasks you may perform using Merge Transformation: 1.Suppose we have a scenario like, we need to merge data from a database table and excel means we want to merge data from two different data sources. For such type of scenario, you can use Merge Transformation. 2.If we want to merge data from two same structured tables but exists two different servers. 3.Sometimes we get an error due to data in a row, after correcting errors in the data we can re-merge rows easily. See below explanations may help you to understand Merge Transformation: I do evaluate here, you already know about the data source, data conversion, data flow, task flow, control flow etc. Note:Before Merge transformation, we need to sort the data using Sort Transformation. After sorting data add data path to Merge…