如何在程序中正确比较日期时间？ （PostgreSQL）

Question

在 PostgreSQL 数据库中，创建如下所示的程序：

CREATE OR REPLACE PROCEDURE tracker(CUSTOM_TIME VARCHAR) AS $FUNCTION$
    BEGIN
        UPDATE SURVEYS SET CONDITION = 3 WHERE CONDITION = 2 AND CUSTOM_TIME > END_PERIOD;
        UPDATE SURVEYS SET BLOCKED = TRUE WHERE CONDITION = 2 AND CUSTOM_TIME BETWEEN START_PERIOD AND END_PERIOD;
    END;
$FUNCTION$ LANGUAGE plpgsql;

当我尝试启动此程序时，它会引发错误。

CALL tracker('2019-03-29 16:37:00');

错误：

SQL Error [42883]: ERROR: operator does not exist: character varying > timestamp without time zone
No operator matches the given name and argument types. You might need to add explicit type casts.
PL/pgSQL function tracker(character varying) line 3 at SQL statement

我在哪里弄错了？

Answer 1

尝试一下。

CREATE OR REPLACE function tracker(CUSTOM_TIME timestamp without time zone) RETURNS void
AS $FUNCTION$
    BEGIN
        UPDATE SURVEYS SET CONDITION = 3 WHERE CONDITION = 2 AND CUSTOM_TIME > END_PERIOD;
        UPDATE SURVEYS SET BLOCKED = TRUE WHERE CONDITION = 2 AND CUSTOM_TIME BETWEEN START_PERIOD AND END_PERIOD;
    END;
$FUNCTION$
LANGUAGE plpgsql;