一个指针变量到底占几个字节

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select * from tbl_Articles WHERE ArticleID=2406711 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2406711 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2406711 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(203065,198715,111870,124947,2693409,2840143,2532276,1095502,1121004,2353216,2112406,116869,1131661,1132489,117990,142073,2015845,1107094,1129351,2748517,130838,155012,125967,130455,424041,2348019,1100033,112521,181821,724007) ORDER BY field (ArticleID,203065,198715,111870,124947,2693409,2840143,2532276,1095502,1121004,2353216,2112406,116869,1131661,1132489,117990,142073,2015845,1107094,1129351,2748517,130838,155012,125967,130455,424041,2348019,1100033,112521,181821,724007)