Postgresql日期减去

Question

如何制作有效的请求，例如：

UPDATE b2c SET tranche = '18 - 25'
WHERE (dateofbirth::date BETWEEN NOW()::date - 18 'year' AND NOW()::date - 25 'year')

感谢您的帮助

Answer 1

dateofbirth::date BETWEEN 
    (NOW() - interval '25 year')::date AND 
    (NOW() - interval '18 year')::date

Answer 2

您可以使用Postgres演员语法：

UPDATE b2c SET tranche = '18 - 25'
WHERE dateofbirth::date BETWEEN 
    NOW()::date - '25y'::interval AND 
    NOW()::date - '18y'::interval

Answer 3

使用EXTRACT()和Age()

select EXTRACT(year FROM age('1995-08-04'::date))::int age 

输出：

age
integer
--------
      20

所以你可以写 where 条件如下

UPDATE b2c SET tranche = '18 - 25'
WHERE EXTRACT(year FROM age(dateofbirth))::int >=18 
 AND  EXTRACT(year FROM age(dateofbirth))::int <=25