How to implement lag function in teradata?

@brandy 

In Teradata, the LAG function can be implemented to return the value from a previous row in a result set. Here is an example of how to use the LAG function in Teradata:

SELECT column1, column2, LAG(column2) OVER (ORDER BY column1) AS lag_column2 FROM your_table;

In this example, the LAG function is used to return the value of "column2" from the previous row, ordered by "column1". The result set will include three columns - "column1", "column2", and "lag_column2" which will contain the value of "column2" from the previous row.

It is important to note that you can specify the number of rows to lag by adding a second argument to the LAG function. For example, LAG(column2, 2) would return the value of "column2" from two rows previous.