7.00.02 - LAG Expression Syntax - Aster Analytics

Teradata Aster® Analytics Foundation User GuideUpdate 2

Product
Aster Analytics
Release Number
7.00.02
Release Date
September 2017
Content Type
Programming Reference
User Guide
Publication ID
B700-1022-700K
Language
English (United States)
{ current_expr operator LAG (previous_expr, lag_rows [, default]) |
  LAG (previous_expr, lag_rows [, default]) operator current_expr }

where:

  • current_expr is the name of a column from the current row (or an expression operating on this column).
  • operator is either >, >=, <, <=, =,or!=
  • previous_expr is the name of a column from a previous row (or an expression operating on this column).
  • lag_rows is the number of rows to count backward from the current row to reach the previous row. For example, if lag_rows is 1, the previous row is the immediately preceding row.
  • default is the value to use for previous_expr when there is no previous row (that is, when the current row is the first row or there is no row that is lag_rows before the current row).