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what is the meaning of the above expr
It finds the last record read in your dataset from column Date_updated in table sort_sales
Note: if it was 0 it was the first record
your assigning the result to vUpdatedate variable.
There is table named 'sort_sales' which has a field named 'Date_updated'. If the table has already been loaded into qv, then this expression would store the last field ('Date_updated') value read into the variable called vUpdateDate.
Read Peek(), for details.