Returns the column of a table
The function GetCol returns the column of a table or a part of it.
If only the table and the number of the column are specified as parameters, the result is the specified column.
If an index and a length are optionally specified, the result is a section of the specified column, starting at the index and with the specified length.
GetCol (table, column)
GetCol (table, column, index, length)
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