从表中选择字段，其中id不在mysql的另一个表中[不起作用]

Question

I'm trying to fetch data from a table and that id is not in another table. I referenced some code example to solve this but it didn't still work. I tried two style for this. My tried sql code is as below and please help me. Thank.

Style 1

SELECT *
FROM quotation q
WHERE q.quotationId NOT IN (SELECT ip.quotation_id FROM invest_project ip)

Style 2

SELECT *
FROM quotation q
LEFT JOIN invest_project ip
ON q.quotationId = ip.quotation_id
WHERE q.quotationId IS NULL

Answer 1

尝试不使用别名...

SELECT * FROM quotation WHERE quotation.quotationId NOT IN (SELECT quotation_id FROM invest_project)

Answer 2

When you specify condition to not display null value data so try this

SELECT *
FROM quotation q
WHERE q.quotationId NOT IN (SELECT ip.quotation_id FROM invest_project ip) or q.quotationId is null

Answer 3

Select *  
from [Table1] AS T1  
where not exists( select * from [Table2] AS T2 where T1.ID = T2.ID)  

This Work For Me