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'''Examples''': PREVIOUS_DATE(1;4) - return the closest ''01/04'', in other words, until "01/04/current year", returns "01/04/last year",
after that returns "01/04/current year".
=== Special variables ===
Special variables can be use with the expressions.
@count - Total number of lines returned in a table.
@row - current line number.
@sum[Column] - Sum of indicated column.
@avg[Column] - Avg of indicated column like @sum[Column] / @count
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