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關於資料型態
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資彥 解
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關於資料型態
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記憶體 0xFFFF 0x0000 . . . 123456 Int
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 可以放0或1
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 如果是1,則表示數值是負數 如果是0,則表示數值是正數 31個位元用來表示數值
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連結
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符號位元 指數位元 小數(尾數)部分 以雙精準度(Double)型別為例子:
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• • 流水號不需要負數,如果宣告成INT,我們會有2147483647種數 值是完全用不到的。但如果宣告成UNSIGNED INT
我們便能增加正 數所能表示的範圍,充分利用變數空間。 • • 如果一筆資料它的數值範圍只有0~200,通常人的體重也只在這個範圍 內,那我們不需要用整數來存放這個資料,可以選擇用BYTE或CHAR來存 放這個資料,尤其在資料庫系統中,資料數量龐大就能明顯發現資料型 別的不同所造成執行效率上的差異。 • • 若將日期以字串的形式儲存,要分別取出年、月、日得再做字串處理 • 若將日期以DATE或相應的日期資料型別儲存,通常有對應的方法可以直接取出 年、月、日,如YEAR=DATE.YEAR()
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