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                在SQL中,統計使用Count 謂詞,而其它的聚合運算還有 求平均AVG,求和SUM,求最大MAX,求最小MIN,這些框架都支持,且用法一樣。下面只舉例count的用法 ~~~ UserTab user = new UserTab(); OQL qcount = OQL.From(user).Select() .Count(user.UserID, "") .END; var u = EntityQuery<UserTab>.QueryObject(qcount); ~~~ 相當于執行語句: `Select count(UserID) as UserID from UserTab` 這樣讀取這個值: `int theCount = u.UserID;` 可也以這樣 ~~~ UserTab user = new UserTab(); OQL qcount = OQL.From(user).Select() .Count(user.UserID, "theCount")//注意這個theCount .END; var u = EntityQuery<UserTab>.QueryObject(qcount); int theCount = Convert.ToInt32(u.PropertyList("theCount"));//對應上面的theCount ~~~ 支持的有Count、Avg、Max、Min、Sum等。
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