Thank you all. The solution of Jean-Christophe is perfect and thanks to
Igor and Michael I begin to understand the logic of the processing of dates
in SQLite, which is much more powerful than it had expected at first.
sqlite> select * from fechas where fecha between date('2011-12-18','-6
days','weekday 0') and date('2011-12-18','weekday 6');
18|2011-12-18
19|2011-12-19
20|2011-12-20
21|2011-12-21
22|2011-12-22
23|2011-12-23
24|2011-12-24
sqlite> select * from fechas where fecha between date('2011-12-24','-6
days','weekday 0') and date('2011-12-24','weekday 6');
18|2011-12-18
19|2011-12-19
20|2011-12-20
21|2011-12-21
22|2011-12-22
23|2011-12-23
24|2011-12-24
sqlite> select * from fechas where fecha between date('2011-12-21','-6
days','weekday 0') and date('2011-12-21','weekday 6');
18|2011-12-18
19|2011-12-19
20|2011-12-20
21|2011-12-21
22|2011-12-22
23|2011-12-23
24|2011-12-24
Igor... I thought I was faced with a syntax problem, thanks for putting me
on track. ;)
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