可以用SQL实现同样的功能,就是麻烦了点。
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实现交集
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实现差集
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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