Mysql select 表 1 中的所有条目，其中表 2 中没有具有特定 ID 的条目

Question

I have two tables, table surveys and table survey_votes.

I want to select all surveys from table surveys

select * from surveys s 

where there is no entry in table survey_votes equal to a certain user_id that references the survey from table surveys.

Example:

Table surveys

id	question
1	What food do you like best?
2	What is your favorite car brand?

Table survey_votes

id	user_id	survey_id
1	100	1
1	101	1
1	101	2

• If user_id = 100, only survey 2 should be selected. If user_id = 101, no survey should be selected.
• If user_id = 102, both surveys should be selected.

The output table should consist of all columns of the original table surveys. Therefore, for user 102 it should look as follows:

id	question
1	What food do you like best?
2	What is your favorite car brand?

Any help is much appreciated!

Answer 1

SELECT * FROM `survey` s WHERE s.id  NOT IN  
(SELECT sv.`survey_id` FROM `survey_votes` sv WHERE sv.`user_id`=102)

This should help, change "102" with your input user_id