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                含義: 聯合查詢是指將2個或2個以上的字段數量相同的查詢結果,“縱向堆疊”后合并為一個結果。 圖示如下: ``` select id, f1, f2 from join1 union select id2, c1, c2 from join2; ``` ![](https://img.kancloud.cn/f4/d0/f4d04b6b3316a846b82f2b31b2542a77_1006x534.png)
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