怎么计算1寸等于多少厘米

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select * from tbl_Articles WHERE ArticleID=850106 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=850106 LIMIT 0,1
SELECT * FROM tbl_categories where CategoryID=90001 LIMIT 0,1
select * from tbl_Articles_sphinx where id=850106 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(399573,3085716,1693320,399031,883944,1213300,2317664,388089,563786,1778292,1090225,1525730,3357039,425601,442032,427091,86732,974477,101123,1953003,463521,3214142,3489658,598268,216013,2211156,450514,415906,955261,2925476) ORDER BY field (ArticleID,399573,3085716,1693320,399031,883944,1213300,2317664,388089,563786,1778292,1090225,1525730,3357039,425601,442032,427091,86732,974477,101123,1953003,463521,3214142,3489658,598268,216013,2211156,450514,415906,955261,2925476)