如何在 php mysql 中使用“AND”查询获得多于一行

Question

id - idProduct - idFilter
65 -    494    -    3
66 -    495    -    3
67 -    497    -    17
68 -    500    -    17
69 -    500    -    3

How I can get all idProducts who have idFilter 17 AND 3. In this case this is only product with id - 500

I try something like this: $query="SELECT idProduct FROM tablename WHERE (idFilter = '3') OR (idFilter = '17') GROUP BY idProduct";

I know it's stupid but I don't know any idea?

Thank you

Answer 1

In case if you need to compare multiple row values on a single column, Such that the value should satisfy with an ANS condition.

Then you can do the following trick to achieve that:

SELECT distinct(idProduct) as idProduct,count(*) AS total FROM  tablename 
        WHERE idFilter IN (17,3) GROUP BY idProduct  
        HAVING total = 2; 
        //Having will force result to have both 17 and 3  else 17 or 3 alone will be in the result
    

If using php variable for the above ids, you can try the following

$inArray = array(17,3);
$sql = "SELECT distinct(idProduct) as idProduct,count(*) AS total FROM  tablename 
        WHERE idFilter IN (".implode(',',$inArray).") GROUP BY idProduct  
        HAVING total = '".count($inArray)."'";