嘿,这是我正在使用的SQL语句
$sql = "SELECT number, COUNT(name) FROM people WHERE id='$id' GROUP BY number";
$result = mysql_query($sql);
while($row = mysql_fetch_array($result)){
$statarray['stat'.$i] = $row['COUNT(name)'];
$i++; }
数字列针对每个名称存储0,1,2或3,因此数组返回总计每个数字的名称数量。这样可以正常工作。
唯一的问题是,如果所有名称都有一个存储的数字1,我的数组条目'stat0'不告诉我有多少0,因为它被1的数量所取代(这是因为有数组中没有0,因此第一个输出是1s)..
如何找出有多少名字在其数字栏中有0s 1s 2s和3s,包括什么时候没有?...提前感谢。
答案 0 :(得分:3)
SELECT numbers.number ,
COUNT(name)
FROM ( SELECT 0 AS number
UNION ALL
SELECT 1
UNION ALL
SELECT 2
UNION ALL
SELECT 3
) numbers
LEFT JOIN people ON people.number = numbers.number AND id='$id'
GROUP BY numbers.number
或者,如果您有根据评论的永久号码表
SELECT numbers.number ,
COUNT(name)
FROM numbers
LEFT JOIN people ON people.number = numbers.number
AND id = '$id'
WHERE numbers.number BETWEEN 0 AND 3
GROUP BY numbers.number