我怎么知道一个值出现在mysqli选择中的次数

Question

请问我如何知道大卫获得2票的投票

Name  | Vote
-------------
|Gabri| 2
|David| 2
|Janny| 3
|David| 1
|David| 2
|Fally| 3

Answer 1

$sql = "SELECT count(*) from table_name WHERE Name= 'David' and Vote=2";
$result = mysqli_query($con, $sql);
$fetch = mysqli_fetch_assoc($result);
echo "<pre>";
print_r($fetch);
echo "<pre>";

输出

Array
(
    [count(*)] => 4
)

要获得值，您只需要echo $fetch['count(*)']; //outputs 4 echo $fetch['count(*)']; //outputs 4

Answer 2

select Name , count(Name) where Name = 'David' group by Name having count(Name) =2