Returns the time slice between the date of the current case and the last date of the training set.
A scalar value of the type integer.
If the Lag function is used on a model where the KEY TIME column is located within a nested table, the function must be located within the sub-select of the statement.
The following example returns cases that fall within the last 12 months of the data that was used to train the model.
SELECT * FROM [Forecasting].CASES WHERE Lag() < 12