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substring or substr 字符串截取
You saw in Part 1, Figure 13 that the cn attribute type has a field called substr, which defines the matching rules for substring match.
在第1部分的图13可以看到，cn属性类型有一个叫做SUBSTR的字段，它定义了子字符串匹配的匹配规则。
Mask column 3 by entering the following in the field that contains COL3: SUBSTR (COL3, 1, 5).
通过在包含COL3的字段中输入下面的内容可以屏蔽列3：substr (COL3, 1,5)。
Functions like SUBSTR and LENGTH work with characters when called in conjunction with UCS-2 data types.
当用ucs - 2数据类型调用时，SUBSTR和LENGTH等函数处理字符。
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