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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語句大全之聯合查詢

      • 2015-01-18 22:49 來源:未知

      聯合查詢sql語句大全

      對于不同的查詢操作會生成不同的查詢結果集,但在實際應用中會希望這些查詢結果集連接到一起,從而組成符合實際需要的數據,此時就可以使用聯合查詢。使用聯合查詢可以將兩個或更多的結果集組合到一個結果集中,新結果集則包含了所有查詢結果集中的全部數據。
      使用聯合查詢的一般語法結構為:
      SELECT search_list
      FROM table_source
      [WHERE search_conditions]
      {UNION [ALL]
      SELECT select_list
      FROM table_source
      [WHERE search_conditions]}
      [ORDER BY order_expression]
      大括號中聯合查詢通過UNION子句實現,其中ALL關鍵字為可選的:如果在UNION子句中使用該關鍵字,則返回全部滿足匹配的結果;如果不使該關鍵字,則返回結果中刪除滿足匹配的重復行。在進行聯合查詢時,查詢結果的列標題為第一個查詢語句的列標題。因此,必須在第一個查詢語句中定義列標題。
      例如在“制造商信息”表和“供貨商信息”表中,創建聯合查詢。可以使用下面的語句:
      USE 網店購物系統
      SELECT 制造商名稱 AS '制造商及地址',制作商電話 AS '傳真及電話'
      FROM 制造商信息
      UNION
      SELECT 供貨商地址,供貨商電話
      FROM 供應商信息
      上面語句中,在第一個SELECT語句中定義了返回結果新列名,分別是“制造商及地址”和“傳真及電話”,使用UNION子句連接兩個查,執行語句后,得到的結果如圖5-33所示。

      圖5-33  使用聯合查詢
      在所有聯合查詢時,一定要注意以下幾點:
      l  所有UNION查詢必須在SELECT列表中有相同的列數。即如果第一個SELECT語句有3列,那么第二個SELECT語句中也必須有3列。
      l  UNION返回結果集的列名僅從第一個查詢獲得。如果第一個SELECT語句中定義了列名,那么不管其他SELECT語句中是否為列定義了別名,UNION子句返回的結果集都是在第一個SELECT語句中定義的內容。
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