-- 创建触发函数 --
CREATE OR REPLACE FUNCTION update_modified_column() 
RETURNS TRIGGER AS $$
BEGIN
    NEW.update_time = now();
    RETURN NEW; 
END;
$$ language "plpgsql";
 
-- 创建触发器  on 后面是对应数据库的表名--
CREATE TRIGGER update_customer_modtime BEFORE UPDATE ON area FOR EACH ROW EXECUTE PROCEDURE  update_modified_column();

-- 查询所有触发器 --
SELECT * FROM pg_trigger;
-- 查询所有触发函数 --
select * from pg_proc;

select date_part("day", "2015-01-15 17:05"::timestamp - "2013-01-14 16:05"::timestamp);

select ("2015-01-15 17:05"::timestamp)::date - ("2015-01-14 19:05"::timestamp)::date;

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