我的表如下:
guid version
A1 lol
A2 roflmao
A1 lol
A1 lol
A2 lol
A3 roflmao
A3 roflmao
A3 roflmao
A3 roflmao
A3 roflmao
A3 roflmao
A4 roflmao
A4 roflmao
A5 lol
A5 lol
我想计算一下,那么roflmao出现的次数总共少于3次(每个GUID)。
到目前为止,我有以下内容,但未输出任何内容:
$sql="select guid,version, count(*) as `count`
from mytable WHERE version = 'roflmao' group by guid having `count` < 3'";
if ($result=mysqli_query($con,$sql))
{
// Return the number of rows in result set
$rowcount=mysqli_num_rows($result);
printf($rowcount);
// Free result set
mysqli_free_result($result);
}
最佳答案
尝试这个:
SELECT COUNT(*) FROM (
SELECT guid
FROM YourTable
WHERE version = 'roflmao'
GROUP BY guid
HAVING COUNT(*) <3) t
首先,选择所有出现“ roflmao”的向导,使其少出现3次,然后对它们进行计数。