For example, the key could be a unique user ID, a stock symbol or, in our case, a zip (postal) code.
例如，主键可以是一个唯一的用户ID、一个股票符号，在我们的实例中，主键是一个邮政编码。
A symbol is a resource identifier (id) that consists of two parts: a text string (symbol name) mapped to an integer value (symbol value).
符号是资源标识符(ID)，由两部分组成：文本字符串(符号名)及其映射的整数值(符号值)。
The result set columns that should remain are id, holdingtype, symbol, and qty, as shown in Figure 8.
应该保留的结果集列是id、holdingtype、symbol和qty，见图8。
The column definitions that should remain are id, holdingtype, symbol and qty, as shown in Figure 7.
应该保留id、holdingtype、symbol和qty的列定义，见图7。
The column definitions that should remain are id, holdingtype, symbol and qty, as shown in Figure 7.
应该保留id、holdingtype、symbol和qty的列定义，见图7。
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