This paper proposes a random access scan and test approach, which deals with the compatible issue of scan unit to produce new test group.

提出一种随机存取扫描测试方法，对扫描单元进行相容处理，以形成新的测试集合。

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In the previous section you learned about one type of access method, index scan (IXSCAN), and one type of join method, nested loop join (NLJOIN).

在之前的部分您已经了解了一种类型的访问方法，即索引扫描(IXSCAN)，和一种类型的联接方法，即嵌套循环联接(NLJOIN)。

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However, all modern smartphones have Wi-Fi built in, and wireless networks are common enough in indoor spaces that an app could easily scan for known access points and calculate your position using trilateration.

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This app allows users to access bar codes and QR codes to scan for payment or admission.

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Computer geeks call it war-driving or Net stumbling: roving around with a Wi-Fi-enabled laptop to scan for nearby Wi-Fi access points, then trying to see if they can use them for free.

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