sql语句学习（NOT EXISTS 和 NOT IN ）

Posted 2020-10-19 疑是银河落九天

NOT EXISTS

SELECT
　　a.*
FROM
　　t_user a
WHERE
　　a.id_card LIKE ‘%3203821995100%‘
AND NOT EXISTS (
SELECT
　　id
FROM
　　tr_user_product_doctor tupd
WHERE
　　a.id = tupd.user_id
)

 

NOT IN

SELECT
　　a.*
FROM
　　t_user a
WHERE
　　a.id_card LIKE ‘%3203821995100%‘
AND a.id NOT IN (

SELECT DISTINCT
　　user_id
FROM
　　tr_user_product_doctor
)

 

说明 ： 根据id_card查询不在tr_user_product_doctor表中出现的user_id