The first thing you'll note is that each line is a statement — semicolons (;) are not required to end lines — and that variables are not declared.
要注意的第一件事是每一行就是一个语句——不需要分号(;)来结束这些行——并且变量没有声明。
Note that a single SQL statement can contain multiple aggregations.
注意,一条sql语句中可以包含多个聚集。
Note: To detect a cycle, only the results returned by the iterative SELECT statement are checked.
注意:要检测循环,在检测循环时,系统只会检查迭代select语句返回的结果。
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