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                * 含義: 列子查詢查出的結果為“一列數據”,類似這樣: ``` select pinpai from product where chandi = ‘北京’; ``` 結果為: ![](https://img.kancloud.cn/c1/f2/c1f23c616a24248e118d66f763a2c161_128x124.jpg) * 使用: 列子查詢通常用在where子句的 in 運算符中,代替in運算符中的“字面值”列表數據。 比如: ``` select * from product where chandi in ( '北京', '深圳','天津' ) ``` 如果in中的數據并不方便一個一個列出,但可以通過一個查詢得到,就可以使用查詢來實現: ``` select * from product where chandi in ( select chandi from product price > 4000 ); ``` 示例: 查出出產貴重商品(假設價格超過5000即為貴重商品)的那些產地的所有商品。 ![](https://img.kancloud.cn/97/d4/97d4f5433e6439dede17ac2cdd63fb81_910x267.jpg)
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