关内和关外指的是什么关

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select * from tbl_Articles WHERE ArticleID=488501 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=488501 LIMIT 0,1
select * from tbl_Articles_sphinx where id=488501 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1103487,1115555,801826,1087241,1104545,1114840,1099323,1091029,3450697,865683,1092341,1116579,2580230,1592409,1298096,1094319,846325,1094807,1097001,1082151,1305446,3322092,3097132,1086268,1119852,1093402,1105922,633533,821757,1117401) ORDER BY field (ArticleID,1103487,1115555,801826,1087241,1104545,1114840,1099323,1091029,3450697,865683,1092341,1116579,2580230,1592409,1298096,1094319,846325,1094807,1097001,1082151,1305446,3322092,3097132,1086268,1119852,1093402,1105922,633533,821757,1117401)