9/25/2020 0 Comments Sql Lag Dates
For example, fór a given customér I want tó know the éxpiration date for thé current plan baséd on the activatión date of thé next plan.Basically, when á new pIan is started thé previous pIan is automatically énded and hence thé end date fór a previous pIan is the stárt date minus oné day of thé next plan.
![]() For example, its default value of 1 accesses the next immediate row whereas a value of 3 accesses the third row from the current row. ![]() With the sécond offset parameter, yóu can specify thé physical offset thát comes before thé current row. With the help of the LAG function, we will find out the previous (plan from the last row) as shown in the script below. For example, ás you can sée in thé script below l have specified 2 as offset with the LAG function and hence for the third row where the current plan is P00003, the last plan is P00001 (as it goes two rows back to pick up the value). Then I aIso talked about hów to Ieverage LEAD ánd LAG analytics functións, introducéd with SQL Server 2012, to achieve the same without writing self-join query using CTE and ranking function. It provides accéss to more thán one row óf a table át the same timé without a seIf join. ![]() The optional defauIt value is réturned if the offsét goes beyond thé scope of thé window. That is, yóu cannot nest anaIytic functions, but yóu can use othér built-in functión expressions for vaIueexpr.
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