什么是关系型数据库

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select * from tbl_Articles WHERE ArticleID=672638 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=672638 LIMIT 0,1
select * from tbl_Articles_sphinx where id=672638 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1121928,3136381,1085934,574261,1975014,3118074,1104421,2398600,1118741,559606,704059,1397020,1122603,2957372,362097,1087265,549720,1942639,1120845,1102102,2816533,1081931,1102516,2279360,1129916,563038,1114310,534528,1115227,1120635) ORDER BY field (ArticleID,1121928,3136381,1085934,574261,1975014,3118074,1104421,2398600,1118741,559606,704059,1397020,1122603,2957372,362097,1087265,549720,1942639,1120845,1102102,2816533,1081931,1102516,2279360,1129916,563038,1114310,534528,1115227,1120635)