Generating attendance list for hours without a matching row - sqlite

Question

I have a project that calculates work hour from the attendance logs that I import from attendance machine. I use SQLite database and VB .NET.
First I'll show the table that I use:
CREATE TABLE [CheckLogs] (
[IDCheckLog] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
[IDEmployee] TEXT NOT NULL,
[Dates] TEXT NOT NULL,
[In] TEXT,
[Out] TEXT,
[OverTime] NUMERIC DEFAULT 0);
CREATE TABLE integers (i INTEGER NOT NULL PRIMARY KEY);
INSERT INTO integers (i) VALUES
(0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
Table CheckLogs is the data that I import from the attendance machine. The OverTime column is calculated in my program. Table integer is used to create the date list, I got it from here.
I want to generate a view that shows employee attendance between 2 dates and display the CheckLogs data if the employee is present and null if absent. Because in the table CheckLogs, when the employee is absent then there is no data from that day from this employee.
This is the view that I desired (this is report for employee 10001 between 2014-10-01 and 2014-10-05):
Dates | IDEmployee | In | Out
---------------------------------------
2014-10-01 | 10001 | 07:00 | 16:00
2014-10-02 | 10001 | 07:01 | 15:58
2014-10-03 | 10001 | null | null
2014-10-04 | 10001 | 07:08 | 15:48
2014-10-05 | 10001 | null | null
And this is the query that I have now:
SELECT X.[Dates], C.[IDEmployee], C.[In], C.[Out]
FROM
(select date('2014-10-01', '+' || (H.i*100 + T.i*10 + U.i) || ' day') as Dates
from integers as H
cross
join integers as T
cross
join integers as U
where date('2005-01-25', '+' || (H.i*100 + T.i*10 + U.i) || ' day') <= '2014-10-05') AS X
, CheckLogs AS C USING (Dates)
WHERE C.[IDEmployee]='10001'
From this query I have this result:
Dates | IDEmployee | In | Out
---------------------------------------
2014-10-01 | 10001 | 07:00 | 16:00
2014-10-02 | 10001 | 07:01 | 15:58
2014-10-04 | 10001 | 07:08 | 15:48

Answer 1

To get NULL values for rows without a match, you need an outer join.
And you have to take care not to filter out those rows with a WHERE clause that would not match NULL values; to get dates that do not match a condition, you have to put that condition into the join's ON clause:
SELECT ...
FROM ( ... ) AS X
LEFT JOIN CheckLogs AS C ON C.Dates = X.Dates AND
C.IDEmployee = '10001'