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                ## 局部變量 作用范圍在begin到end語句塊之間。在該語句塊里設置的變量,declare語句專門用于定義局部變量。 1. 局部變量是使用declare關鍵字聲明. 2. 局部變量declare語句出現的位置一定是在begin和end之間(beginend是在大型語句塊中使用:函數/存儲過程/觸發器). 3. 聲明語法:declare 變量名 數據類型 [屬性];
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