PostrgeSQL中的程序

Question

目标是在PostgreSQL中导入和使用过程（通过pgAdmin和Shell）。我的任务以任务结束，错误screen of mistake here。

代码示例（来自教程）：

CREATE OR REPLACE FUNCTION add_event(
                                      title text, 
                                      starts TIMESTAMP,
                                      ends TIMESTAMP, 
                                      venue text, 
                                      postal VARCHAR(9), 
                                      country CHAR(2) 
                                      )
RETURNS BOOLEAN 
AS $$
DECLARE
    did_insert BOOLEAN := FALSE;
    found_count INTEGER;
    the_venue_id INTEGER;

BEGIN
    SELECT venue_id INTO the_venue_id
    FROM venues v
    WHERE v.postal_code=postal 
                  AND v.country_code=country 
                  AND v.name LIKE venue
    LIMIT 1;

    IF the_venue_id IS NULL THEN
        INSERT INTO venues (name, postal_code, country_code)
        VALUES (venue, postal, country)

        RETURNING venue_id INTO the_venue_id;
        did_insert := TRUE;
    END IF;

RAISE NOTICE ‘Venue found %’, the_venue_id;

INSERT INTO events (title, starts, ends, venue_id)
VALUES (title, starts, ends, the_venue_id);

RETURN did_insert;

END;
$$ LANGUAGE plpgsql;