在MySql中，您可以
SUM()在条件上使用该函数，因为错误条件将等于
0，而真正条件将等于
1：
SELECt SUM(userID_follower = $myID) AS followerCount, SUM(userID_following = $myID) AS followingCountFROM t1WHERe userID_follower = $myID OR userID_following = $myID
在MySql中，您可以
SUM()在条件上使用该函数，因为错误条件将等于
0，而真正条件将等于
1：
SELECt SUM(userID_follower = $myID) AS followerCount, SUM(userID_following = $myID) AS followingCountFROM t1WHERe userID_follower = $myID OR userID_following = $myID
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