从表1从特定条件的元素table1的选择表2中不存在

Question

表words包含列：word_idword

我的查询打印为：

SELECT word FROM words WHERE condition1 AND condition2 ORDER BY RAND() LIMIT 5000

表solved包含列：user_idword_id

我想取5000条随机行，条件是它们都不是基础d表solved为user = username

到目前为止，我已经试过：

SELECT word FROM words w 
WHERE not exists 
(select 1 from solved s where s.word_id = w.word_id 
AND s.user_id = 'username') 
AND condition1 AND condition2 ORDER BY RAND() LIMIT 5000 

Answer 1

使用LEFT JOIN为塔尔：

SELECT word 
FROM words w 
left join solved s on s.word_id = w.word_id AND s.user_id = 'username' 
WHERE w.word_id is null 
AND condition1 AND condition2 
ORDER BY RAND() LIMIT 5000