MySQL實現差集(Minus)和交集(Intersect)

MySQL實現差集(Minus)和交集(Intersect)

MySQL沒有實現Minus和Intersect功能，就像它也沒有實現cube的功能一樣。
 
可以用SQL實現同樣的功能,就是麻煩了點。
 
drop table t1;
 
drop table t2;

create table t1(id int primary key,nickname varchar(20),playNum varchar(20));

create table t2(id int primary key,nickname varchar(20),playNum varchar(20));

insert into t1 values(1,1,10);

insert into t1 values(2,2,20);

insert into t1 values(3,3,30);

insert into t2 values(1,1,10);

insert into t2 values(2,2,200);

insert into t2 values(3,33,300);

commit;

MySQL實現交集
 
SELECT id, nickname, playNum, COUNT(*)
 
FROM (SELECT id, nickname, playNum

    FROM t1

    UNION ALL

    SELECT id, nickname, playNum

    FROM t2

    ) a

GROUP BY id, nickname, playNum

HAVING COUNT(*) > 1

MySQL實現差集
 
SELECT t1.id, t1.nickname, t1.playNum
 
FROM t1 LEFT JOIN t2 ON t1.id = t2.id

WHERE t1.nickname != t2.nickname

    OR t1.playNum != t2.playNum;

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