SQLite compare dates

Question

I have this SQL-Statement:

SELECT Geburtsdatum FROM Kunde
WHERE Geburtsdatum BETWEEN \'1993-01-01\' AND \'2000-01-01\'

but I get some weird

Answer 1

From the documentation:

SQLite does not have a storage class set aside for storing dates and/or times.

So your column isn't exactly stored as a date. Reading further, we learn that columns specifed as DATE are actually stored as NUMERIC using affinity rule 5.

Going back up to section 1.2:

REAL as Julian day numbers, the number of days since noon in Greenwich on November 24, 4714 B.C. according to the proleptic Gregorian calendar.

Good. So let's try:

SELECT Geburtsdatum FROM Kunde
WHERE Geburtsdatum 
    BETWEEN julianday('1993-01-01') AND julianday('2000-01-01'); 

---

Oddly enough, SQL Fiddle seems to store DATEs as strings and the above doesn't work. In this case, the following should:

SELECT Geburtsdatum FROM Kunde
WHERE date(Geburtsdatum)
    BETWEEN date('1993-01-01') AND date('2000-01-01'); 

Additionally, in your case you seem to be getting some strange (read: localized) format returned. I wonder if it really is a string in your case too, just with a different format. You could try:

SELECT Geburtsdatum FROM Kunde
WHERE strftime('%d.%m.%Y', Geburtsdatum)
    BETWEEN date('1993-01-01') AND date('2000-01-01');