The NTH_VALUE() function was first introduced with other window functions in MariaDB 10.2.
NTH_VALUE (expr[, num_row]) OVER ( [ PARTITION BY partition_expression ] [ ORDER BY order_list ] )
The NTH_VALUE
function returns the value evaluated at row number num_row
of the window frame, starting from 1, or NULL if the row does not exist.
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Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.
https://mariadb.com/kb/en/nth_value/