数据库有哪几种类型约束

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select * from tbl_Articles WHERE ArticleID=2031059 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2031059 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2031059 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1079820,1049816,1088670,1073493,1113706,1094511,1085904,3247491,1368929,1052105,1094235,1130043,1100427,1133285,1368851,2610985,1496912,1082874,1102554,1742954,1132489,1118180,1484894,1133135,1123263,1064291,1130918,1123739,1372281,1084089) ORDER BY field (ArticleID,1079820,1049816,1088670,1073493,1113706,1094511,1085904,3247491,1368929,1052105,1094235,1130043,1100427,1133285,1368851,2610985,1496912,1082874,1102554,1742954,1132489,1118180,1484894,1133135,1123263,1064291,1130918,1123739,1372281,1084089)