On 8/4/14, Mark Lawrence <no...@null.net> wrote: > I try to remember to define GROUP BY values when using aggregate > functions (and I wish SQLite considered it an error otherwise) but I > forget once and the result surprised me. > > It is expected behaviour that a row is returned in this situation even > through the tables are empty? Adding a "GROUP BY x.id" returned the > expected empty set.
This is the behavior I expect from the documentation. Specifically, the documentation for the SELECT statement at "http://sqlite.org/lang_select.html"; says > If the SELECT statement is an aggregate query without a GROUP BY clause, then > each aggregate expression in the result-set is evaluated once across the > entire dataset. [...] Or, if the dataset contains zero rows, then each > non-aggregate expression is evaluated against a row consisting entirely of > NULL values. > > [...] An aggregate query without a GROUP BY clause always returns exactly one > row of data, even if there are zero rows of input data. -- Ambrus _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
