述语是什么意思

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select * from tbl_Articles WHERE ArticleID=155278 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=155278 LIMIT 0,1
select * from tbl_Articles_sphinx where id=155278 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1496873,2115700,1048788,1102388,1086608,2570957,1063191,1061928,1094015,1533249,2670351,1076790,1131827,1123693,1089662,1080997,1092308,1068154,1075977,1283770,1734211,1105645,1832451,1058463,1070764,1360951,1125532,2301764,1074534,2025923) ORDER BY field (ArticleID,1496873,2115700,1048788,1102388,1086608,2570957,1063191,1061928,1094015,1533249,2670351,1076790,1131827,1123693,1089662,1080997,1092308,1068154,1075977,1283770,1734211,1105645,1832451,1058463,1070764,1360951,1125532,2301764,1074534,2025923)