Denne betingelse vil returnere poster fra søndag til lørdag i sidste uge:
WHERE created BETWEEN
NOW()::DATE-EXTRACT(DOW FROM NOW())::INTEGER-7
AND NOW()::DATE-EXTRACT(DOW from NOW())::INTEGER
Der er et eksempel:
WITH compras AS (
SELECT ( NOW() + (s::TEXT || ' day')::INTERVAL )::TIMESTAMP(0) AS created
FROM generate_series(-20, 20, 1) AS s
)
SELECT to_char( created, 'DY'::TEXT), created
FROM compras
WHERE created BETWEEN
NOW()::DATE-EXTRACT(DOW FROM NOW())::INTEGER-7
AND NOW()::DATE-EXTRACT(DOW from NOW())::INTEGER
Som svar på @d456:
Det rigtige, BETWEEN
omfatter midnat søndag i begge ender af intervallet. For at udelukke midnat om søndagen ved slutningen af intervallet er det nødvendigt at bruge operatorerne >=
og <
:
WITH compras AS (
SELECT s as created
FROM generate_series( -- this would produce timestamps with 20 minutes step
(now() - '20 days'::interval)::date,
(now() + '20 days'::interval)::date,
'20 minutes'::interval) AS s
)
SELECT to_char( created, 'DY'::TEXT), created
FROM compras
WHERE TRUE
AND created >= NOW()::DATE-EXTRACT(DOW FROM NOW())::INTEGER-7
AND created < NOW()::DATE-EXTRACT(DOW from NOW())::INTEGER