SELECT ifnull(Event,'<NULL>') AS E FROM Games GROUP BY E;
MetLife Warsaw Najdorf Chess Festival - 
Najdorf Memorial
----
SELECT ifnull(Site,'<NULL>') AS S FROM Games GROUP BY S;
Warsaw POL
Warszawa
----
SELECT ifnull(EventDate,'<NULL>') AS ED FROM Games GROUP BY ED;
2014.??.??
<NULL>
----
SELECT ifnull(TimeControl,'<NULL>') AS T FROM Games GROUP BY T;
<NULL>
----
SELECT count(*) from Games WHERE length(game) < 10;
1
----
SELECT count(*) from Games WHERE ECO ISNULL OR ECO='?';
51
----
