HasChanged

Return True if an attribute has had any event in the specified time period; otherwise return False.

Syntax

HasChanged(attname, t1)

Arguments

• attname

  The name of an attribute enclosed in single quotation marks

• t1

  The start of a time period ending at execution time; can be any relative time expression in single quotation marks (such as 't - 4h')

Returns

True if attname has any event in the specified time period; otherwise returns False

Example

• HasChanged('att1', 't-4h')

  [Returns True if 'att1' received any updates since 8 p.m. last night, regardless of whether the update changed the actual attribute value]