在一个查询SQL中获得好友总数

Question

I want to get the total of friends on one QUERY SQL

I have a table named MEMBERS , and this table have a CALL_FRIEND_ID ,

the CALL_FRIEND_ID is a random ID you give it to your friend and if he/she register using, he/she become your friend by adding your to a column named FRIEND_ID (in the same table)

Now to know the total friend of each one I make two query

SELECT * FROM MEMBERS;

second

SELECT COUNT(*) FROM MEMBERS WHERE FRIEND_ID = :id

but that make the response slowly

I try to use HAVING but without any result, any solution ?

Answer 1

Try this query: from your scenario I guess this'll give your desired output

 select FRIEND_ID,count(CALL_FRIEND_ID) as totalFriends from MEMBERS 
    where FRIEND_ID = :id
    group by FRIEND_ID

Answer 2

As you said when a member register then a random number is assigned to his or her that CALL_FRIEND_ID ,and you want total number of friends in your member table according to group wise of FRIEND_ID so there is need where clause,because where will be applicable if you find any specific FRIEND_ID, so you can use below query

select FRIEND_ID,count(CALL_FRIEND_ID) as totalFriends from MEMBERS 
        group by FRIEND_ID