You need to use the COALESCE function in PostgreSQL http://developer.postgresql.org/pgdocs/postgres/functions-conditional.html
Essentially you need to tell SQL how to handle NULL
s. i.e. When NULL
return 0
.
You need to use the COALESCE function in PostgreSQL http://developer.postgresql.org/pgdocs/postgres/functions-conditional.html
Essentially you need to tell SQL how to handle NULL
s. i.e. When NULL
return 0
.