顿号与逗号的用法区别

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select * from tbl_Articles WHERE ArticleID=2837391 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2837391 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2837391 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1114128,1094057,1107058,1061044,1063517,1072923,1085372,1305479,1103012,1108828,1126430,1098893,1103440,1104266,1102250,1101945,1042020,1066498,1084197,1103556,1103348,1071121,1100033,1062930,1067265,1063159,1092185,1107833,1089162,1099819) ORDER BY field (ArticleID,1114128,1094057,1107058,1061044,1063517,1072923,1085372,1305479,1103012,1108828,1126430,1098893,1103440,1104266,1102250,1101945,1042020,1066498,1084197,1103556,1103348,1071121,1100033,1062930,1067265,1063159,1092185,1107833,1089162,1099819)