> Say I have a column called 'b' in a table called 'test' and every > field in 'b' has a NULL value. What is the expected behavior of the > following query: > > SELECT SUM(b) FROM TEST; > > I guess I'm thinking I'll get back NULL. Instead I get 0 (or, in the > 3.2.5 code, 0.0). > > On the other hand, the following query does return NULL: > > SELECT AVG(b) FROM TEST; >
I should think NULL would be the correct result, but it's not what I get: D:\temp\convention>sqlite3 testnull SQLite version 3.0.8 Enter ".help" for instructions sqlite> create table t( b integer, c integer ); sqlite> insert into t(b) values(1); sqlite> insert into t(b) values(2); sqlite> insert into t(b) values(3); sqlite> select * from t; 1| 2| 3| sqlite> select sum(c) from t; 0 sqlite> select sum(b) from t; 6 sqlite> select count(*) from t where c is null; 3 sqlite> -- --- The Castles of Dereth Calendar: a tour of the art and architecture of Asheron's Call http://www.lulu.com/content/77264
