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=== Special variables ===<!--T:57-->
<!--T:58-->
Special variables can be use with the expressions.
<!--T:59-->@count - Total number of lines returned in a table.
<!--T:60-->@row - current line number.
<!--T:61-->@sum[Column] - Sum of indicated column.
<!--T:62-->@avg[Column] - Avg of indicated column like @sum[Column] / @count
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