简述限界的种类及意义

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select * from tbl_Articles WHERE ArticleID=129945 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=129945 LIMIT 0,1
select * from tbl_Articles_sphinx where id=129945 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1086582,1113349,1048360,1065333,1094393,1098525,1114270,1102156,1075793,1100013,1119007,1070014,1077960,1076199,1114590,1084259,1090937,1117043,1090541,1119317,1110273,1092656,1046512,1087485,1098442,1095424,1092920,1097283,997282,1092225) ORDER BY field (ArticleID,1086582,1113349,1048360,1065333,1094393,1098525,1114270,1102156,1075793,1100013,1119007,1070014,1077960,1076199,1114590,1084259,1090937,1117043,1090541,1119317,1110273,1092656,1046512,1087485,1098442,1095424,1092920,1097283,997282,1092225)