Скачать или смотреть LAG Analytic Function in SQL Server - #6

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QUERY SOLVE -
1. Analytic functions in SQL Server
2. LAG analytic functions in SQL Server
3. Difference between LEAD and LAG analytic functions in SQL Server
4. Syntax of LAG analytic functions
5. Partition by clause in SQL Server
6. Order by clause in SQL Server
7. Default parameters of LAG analytic functions in SQL Server

LAG()
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Working of LAG function is just opposite of LEAD function. LAG Accesses data from a previous row in the same result set without the use of a self-join. LAG provides access to a row at a given physical offset that comes before the current row.

Syntax :
LAG (scalar_expression [,offset] [,default_value])
OVER ( [ partition_by_clause ] order_by_clause )

Parameters :
Scalar expression : The value to be returned based on the specified offset. It is an expression of any type that returns a single (scalar) value. 

Offset : The number of rows forward from the current row from which to obtain a value.

Default_value : The value to return when scalar_expression at offset is NULL.