清单2显示具有4个元素的阵列构造函数，其值分别由NULL常数、变量、文字和标量子查询提供。
Listing 2 shows an array constructor with four elements with values given by the NULL constant, a variable, a literal and a scalar sub-query, respectively.
根据其更改特征设计数据结构，可以对跨多个请求或多个用户保持为常数的数据元素进行标识。
Structuring the data according to its change characteristic enables identification of data elements that stay constant across multiple requests or across multiple users.
就在这件教室下面的大厅那，你们带上元素周期表和常数表，还有一个计算器和一些写的东西。
It is just down the hall from this lecture theater. And you bring the Periodic Table and the Table of Constants and a calculator and something to write with.
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