在区域r上求函数f的平均值,这是什么意思？
What does it mean to take the average value of some function f in this region r?
还有 求和、 求 平均值、计数、 求最大值、 求最小值等库函数。
It provides Data Definition Language (DDL) , Data Manipulation Language (DML) , as well built-in functions, such as:Sum, Average, Count, Maximum and Minimum.
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