SQLite query to join on a range of dates?

Question

I am working with SQLite.

Suppose I have a table sales with two columns, date and count, to keep track of how many glasses of lemo

Answer 1

Create a calendar table and join onto that:

Something like this will do:

create table dates (id integer primary key);
insert into dates default values;
insert into dates default values;
insert into dates select null from dates d1, dates d2, dates d3 , dates d4;
insert into dates select null from dates d1, dates d2, dates d3 , dates d4;
alter table dates add date datetime;
update dates set date=date('2000-01-01',(-1+id)||' day');

That will cover you till 2287-05-20 Adding an index to the date column in the dates table won't hurt. My sqlite is little rusty, so I suggest you consult the manual on that.

Edit: Code for the index:

create unique index ux_dates_date on dates (date);