什么是前端和后端

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select * from tbl_Articles WHERE ArticleID=1017489 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1017489 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1017489 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1930216,3088036,3169960,2622141,1792249,2433945,2986464,1440966,2665759,1571291,2802311,2430795,1080413,2729656,2658792,1676744,2085591,2134454,2532927,1807648,2707980,1086516,2576575,1495199,1905623,2554631,2566934,1064151,1757924,1306663) ORDER BY field (ArticleID,1930216,3088036,3169960,2622141,1792249,2433945,2986464,1440966,2665759,1571291,2802311,2430795,1080413,2729656,2658792,1676744,2085591,2134454,2532927,1807648,2707980,1086516,2576575,1495199,1905623,2554631,2566934,1064151,1757924,1306663)