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                * 形式: ``` where exists ( 任何子查詢 ) ``` * 含義: 該子查詢如果“有數據”, 則該exists()的結果為“true”, 即相當于 where true (恒真) 該子查詢如果“沒有數據”,則該exists()的結果為“false”,即相當于where false(恒假) * 說明: 1,此子查詢語句通常需要用到主查詢語句中的字段作為查詢條件。 * 示例: 1,查詢商品分類名稱中帶“電”字的所有商品; 2,查詢聯想品牌的產品都有哪些分類; ![](https://img.kancloud.cn/1b/fa/1bfad4b2730bd1598af6fbd77c010041_1047x181.jpg) * 特別注意: 通常,有意義exists子查詢不能單獨執行 對比:之前的4種子查詢都可以單獨執行
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