在mysql查询中使用NOT IN的正确方法

Question

I have a mysql query that throws an error which I'm guessing is because of my judicious use of the phrase "NOT IN":

$sqlGetCountry = mysqli_query($link, "SELECT * FROM locations WHERE country='$country' AND CURTIME() > time AND '$state' NOT IN state ORDER BY time desc LIMIT 20");
$sqlNumCountry = mysqli_num_rows($sqlGetCountry);

I have a table with city, state, and country and I'm basically trying to find the queries where a given state ($state in this case, which could be Texas, Hawaii, etc.) is not in the results. I get the error:

mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given

Anybody have a clue?

Answer 1

You can't pass a table to in , but you can pass a subquery:

SELECT  * 
FROM    locations 
WHERE   country='$country' 
        AND CURTIME() > time 
        AND '$state' NOT IN (select state from state)
ORDER BY 
       time desc 
LIMIT  20