充分条件和必要条件什么意思

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select * from tbl_Articles WHERE ArticleID=223090 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=223090 LIMIT 0,1
select * from tbl_Articles_sphinx where id=223090 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1070308,2146364,1560130,1529105,1941195,1067327,1647042,1696807,1355443,1073732,1118993,1129939,1064531,1308000,1068532,1276245,2117619,1044382,1697654,988905,1078286,993095,1073526,1071041,1041271,1070650,1072403,1074686,1308797,1470537) ORDER BY field (ArticleID,1070308,2146364,1560130,1529105,1941195,1067327,1647042,1696807,1355443,1073732,1118993,1129939,1064531,1308000,1068532,1276245,2117619,1044382,1697654,988905,1078286,993095,1073526,1071041,1041271,1070650,1072403,1074686,1308797,1470537)