电路中的P是代表什么

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select * from tbl_Articles WHERE ArticleID=123010 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=123010 LIMIT 0,1
select * from tbl_Articles_sphinx where id=123010 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1124400,998502,1526498,1079437,1125231,1053494,1048788,1101921,1086658,1065399,1133243,1062392,1080171,1096685,1041439,1041345,1112398,1078318,1092163,1081065,1130400,1103070,994016,1109118,1465483,986394,1050439,1132913,1117980,1075688) ORDER BY field (ArticleID,1124400,998502,1526498,1079437,1125231,1053494,1048788,1101921,1086658,1065399,1133243,1062392,1080171,1096685,1041439,1041345,1112398,1078318,1092163,1081065,1130400,1103070,994016,1109118,1465483,986394,1050439,1132913,1117980,1075688)