SQL

使用SQL语句查出哪些人即会玩basketball又会玩badminton,找出这样的name-hobby组合

create table test (NAME varchar(20) not null, HOBBY varchar(20) not null);    
insert into test values('Adam','basketball');
insert into test values('Bill','basketball');
insert into test values('Bill','football');
insert into test values('Cyper','basketball');
insert into test values('Cyper','badminton');
insert into test values('David','basketball');
insert into test values('David','badminton');
insert into test values('David','table tennis');
select * from test t;
--(1)with
WITH
NAME_MATCHES AS
(SELECT NAME
FROM TEST
WHERE HOBBY IN ('basketball', 'badminton')
GROUP BY NAME
HAVING COUNT(NAME) = 2)
SELECT T.*
FROM TEST T, NAME_MATCHES NM
WHERE T.NAME = NM.NAME;
--(2)exists and exists
SELECT *
FROM TEST T1
WHERE EXISTS (SELECT *
FROM TEST T2
WHERE T2.NAME = T1.NAME AND HOBBY = 'basketball')
AND EXISTS (SELECT *
FROM TEST T3
WHERE T3.NAME = T1.NAME AND HOBBY = 'badminton');
--(3)self join
SELECT T1.*
FROM TEST T1, TEST T2, TEST T3
WHERE T1.NAME = T2.NAME AND T1.NAME = T3.NAME AND T2.HOBBY = 'basketball'
AND T3.HOBBY = 'badminton';
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