最后但也很重要的是，第53到63行定义表中最后一行的表示，该行包含该部门雇员的薪水总和。
And last, but not least, lines 53 thru 63 define the presentation of the last line of the table with the total amount of the salaries of the department's employees.
where子句用于选择行的子集以进行汇总和分组，因此在分组前应用where子句。
WHERE clauses are used to select a subset of rows for summarizing and grouping and are thus applied before any grouping is done.
给出一个三角形，找出从其顶端到底端的最小路径的总和，每次移动是下一行的相邻数字。
Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent Numbers on the row below.
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