我有一个查询功能。如果条件为真,我会用新值更新一行。
我做一个查询:
SELECT * FROM transfer_flight(41313, '2017-08-15 20:00:00+05');
我得到一个错误:
ERROR: missing FROM-clause entry for table "flights" LINE 1: SELECT (flights.scheduled_departure < $2) ^ QUERY: SELECT (flights.scheduled_departure < $2) CONTEXT: PL/pgSQL function transfer_flight(integer,timestamp with time >zone) line 7 at IF
CREATE OR REPLACE FUNCTION flightFunc(
flight_identificator INTEGER,
new_timestamp timestamp with time zone)
RETURNS TABLE(
flight_id INTEGER,
flight_no CHARACTER(6),
departure_airport character(3),
scheduled_departure timestamp with time zone,
arrival_airport character(3),
scheduled_arrival timestamp with time zone
)
LANGUAGE plpgsql
AS $$
DECLARE
flight_d timestamp with time zone = scheduled_arrival -
scheduled_departure;
BEGIN
IF (flights.scheduled_departure < $2)
THEN
UPDATE flights
scheduled_departure = $2,
scheduled_arrival = $2 + flight_d
FROM flights
WHERE flights.flight_id = $1
RETURNING
flights.flight_id,
flights.flight_no,
flights.departure_airport,
flights.scheduled_departure,
flights.arrival_airport,
flights.scheduled_arrival;
END IF;
END;
$$;
结果我只需要用输入的 flight_identificator 更新一行
最佳答案
删除 FROM
子句!这执行了一个CROSS JOIN
。你需要 SET
。所以:
UPDATE flights
SET scheduled_departure = $2,
scheduled_arrival = $2 + flight_d
WHERE flights.flight_id = $1
RETURNING
flights.flight_id,
flights.flight_no,
flights.departure_airport,
flights.scheduled_departure,
flights.arrival_airport,
flights.scheduled_arrival;
关于sql - 如何修复 'missing FROM-clause entry for table' ?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54207140/