Window functions and aggregate functions cannot be nested in window functions. Window functions cannot be used together with aggregate functions of the same level. Syntax lag(<expr>[,bigint<offset>[,<default>]])
Introduced in SQL server 2012, the LAG() function is used to access a row at a particular offset which is before the current row. You can access the data of the previous rows in the current row. So, it can be useful if you want to do some calculations or you need a reference to ...
The following example demonstrates specifying various arbitrary expressions and ignoring NULL values in the LAG function syntax.sql העתק CREATE TABLE T (a INT, b INT, c INT); GO INSERT INTO T VALUES (1, 1, -3), (2, 2, 4), (3, 1, NULL), (4, 3, 1), (5, 2, ...
SQL USEAdventureWorks2022; GOSELECTTerritoryName, BusinessEntityID, SalesYTD, LAG (SalesYTD,1,0)OVER(PARTITIONBYTerritoryNameORDERBYSalesYTDDESC)ASPrevRepSalesFROMSales.vSalesPersonWHERETerritoryNameIN(N'Northwest', N'Canada')ORDERBYTerritoryName; ...
This Oracle tutorial explains how to use the SQL Server (Transact-SQL) LAG function with syntax and examples. It is an analytic function that lets you query more than one row in a table at a time without having to join the table to itself.
SQL USEAdventureWorks2022; GOSELECTTerritoryName, BusinessEntityID, SalesYTD, LAG (SalesYTD,1,0)OVER(PARTITIONBYTerritoryNameORDERBYSalesYTDDESC)ASPrevRepSalesFROMSales.vSalesPersonWHERETerritoryNameIN(N'Northwest', N'Canada')ORDERBYTerritoryName; ...
SQL Copier USE AdventureWorks2022; GO SELECT BusinessEntityID, YEAR(QuotaDate) AS SalesYear, SalesQuota AS CurrentQuota, LAG(SalesQuota, 1,0) OVER (ORDER BY YEAR(QuotaDate)) AS PreviousQuota FROM Sales.SalesPersonQuotaHistory WHERE BusinessEntityID = 275 AND YEAR(QuotaDate) IN ('2005','...
SQL Server 2012 introduced new analytical function LEAD() and LAG(). These functions accesses data from nth next row and nth previous row in the same result set without the use of a self-join: LEAD(): It is used to access data from nth next row in the same result set without the ...
SQL USEAdventureWorks2022; GOSELECTTerritoryName, BusinessEntityID, SalesYTD, LAG (SalesYTD,1,0)OVER(PARTITIONBYTerritoryNameORDERBYSalesYTDDESC)ASPrevRepSalesFROMSales.vSalesPersonWHERETerritoryNameIN(N'Northwest', N'Canada')ORDERBYTerritoryName; ...
SQL Copy What is the LAG function? The LAG function is used to access data from the previous row in a result set. The syntax of the LAG function is similar to the LEAD function. LAG(expression,offset,default)OVER(ORDERBYorder_expression) ...