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, playNumFROM t1UNION ALLSELECT id, nickname, playNumFROM t2) aGROUP BY id, nickname, playNumHAVING COUNT(*) > 1
MySQL实现差集
SELECT t1.id, t1.nickname, t1.playNum FROM t1 LEFT JOIN t2 ON t1.id = t2.idWHERE t1.nickname != t2.nicknameOR t1.playNum != t2.playNum;
每个人都需要一台速度更快、更稳定的 PC。随着时间的推移，垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是，许多工具可以让 Windows 保持平稳运行。
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