sql like datetime 查詢數據庫大小信息

SELECT * FROM SYS.DATABASE_FILES      ---------查詢數據庫信息

string sql = "select pminfo_Remark from pminfo where pminfo_groupname='" + zb + "' and convert(varchar(50),pminfo_pmDate,120) like '" + rq + "%'";--------------------------模糊查詢like  與datetime格式字段