mysql clause where not null in php

Question

I am making a query which is not working. I want to get data where column of pic in is not empty in all_destination table, also I am using join in my query:

SELECT * 
FROM  `travels_detail` 
INNER JOIN all_destination ON travels_detail.destination = all_destination.destination
WHERE all_destination.pic IS NOT NULL

whats wrong in my query?

Answer 1

You should check what is the error returned by MySQL. It will tell you what is the error.

Answer 2

You just want to remove the IS NOT NULL check and just have

SELECT * 
FROM  `travels_detail` 
INNER JOIN all_destination ON travels_detail.destination = all_destination.destination
WHERE all_destination.pic;

This will only return records where all_destination.pic has been set.

Answer 3

try this:

SELECT td.some_attribute
FROM  travels_detail as td
INNER JOIN all_destination as ad  ON td.destination = ad.destination
WHERE ad.pic IS NOT NULL

Answer 4

您可以尝试一下。

SELECT * FROM `travels_detail` INNER JOIN all_destination ON travels_detail.destination = all_destination.destination WHERE all_destination.pic ! = ""