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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      • sql語句大全之自連接

      • 2015-01-18 22:48 來源:未知

      自連接

      sql語句大全

      前面介紹了多種方式實現兩個或多個表之間連接查詢,但對同一個表同樣也可以進行連接查詢,這種連接查詢方式就稱為自連接。對一個表使用自連接方式時,需要為該表定義一個別名,其他內容與兩個表的連接操作完全相似,只是在每次列出這個表時便為它命名一個別名。
      在自連接中可以使用內連接或外連接等連接方式,例如對“商品信息”表實現自連接,并在連接時使用內連接,可以使用下面語句:
      USE 網店購物系統
      SELECT A.商品名稱,B.商品編號,A.商品價格,B.庫存數量
      FROM  商品信息 AS A INNER JOIN 商品信息 AS B
      ON  A.商品編號 = B.商品編號
      WHERE A.商品價格 BETWEEN 200 AND 300
      ORDER BY A.商品價格
      可以看到,在上面的語句中為該表創建了兩個別名A和B,接下來將A和B作為兩個不同的表進行查詢,執行語句后,得到的結果如圖5-32所示。

      圖5-32  在自連接中使用內連接
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