对于浮点数及定点类型，M是数字存储的总位数。
For floating-point and fixed-point types, m is the total number of digits that can be stored.
底下的影片，我们针对三种不同类型的场景进行测试：巴士上、边走边拍以及定点平移拍摄。
The video below is the result of our test in three types of scenarios: sitting on the bus, walking around, and panning on the spot.
SQL - 92包括DECIMAL数据类型，它是用于表示定点小数的精确数字类型，它可以对小数进行基本的算术运算。
SQL-92 includes a decimal data type, which is an exact numeric type for representing fixed point decimal Numbers and performs basic arithmetic operation on decimal Numbers.
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