集合的三种运算分别是什么

页面:/news/view-1531886/ | 耗时:0.6959 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=1531886 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1531886 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1531886 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1049908,1057471,1062346,1045659,1062646,1130184,1067895,1077240,1066852,1066470,1064249,1306879,1288643,1114236,1094057,1085576,1060887,1057904,1064783,1048000,1064449,1053494,1054832,3173365,990402,1043033,1064511,1049048,1501819,1052549) ORDER BY field (ArticleID,1049908,1057471,1062346,1045659,1062646,1130184,1067895,1077240,1066852,1066470,1064249,1306879,1288643,1114236,1094057,1085576,1060887,1057904,1064783,1048000,1064449,1053494,1054832,3173365,990402,1043033,1064511,1049048,1501819,1052549)