The value space of the duration datatype consists of an integral number of months and a decimal number of seconds.
duration 数据类型的值空间包含一个表示月数的整数和一个表示秒数的小数。
One takes a double-precision floating point as input, another takes an integer and a scale factor, and another takes a String representation of a decimal number.
其中一个构造函数以双精度浮点数作为输入，另一个以整数和换算因子作为输入，还有一个以小数的String表示作为输入。
Some SQL dialects prefer to call this type NUMERIC, and others also include a MONEY data type, which is defined as a decimal number with two places to the right of the decimal.
一些SQL语言喜欢称此类型为NUMERIC类型，其它一些SQL语言则引入了MONEY数据类型，MONEY数据类型被定义为小数点右侧带有两位的小数。
Returns a hexadecimal value when given a decimal number.
如果给定的是十进制数，则返回十六进制的值。
The octdec function converts an octal number to a decimal number.
函数的作用是：将一个八进制数转换为十进制。
A dot written in a decimal number to indicate where the place values change from positive to negative powers of 10.
十进制小数中的点，表示从该点开始，值就从10的正次幂变成10的负次幂。
A decimal number may be represented in coded binary form.
一个十进制的数可以用编码二进制形式来代表。
A decimal number such as 1000.1 should be displayed as 1,000.1 in the U.S. but as 1.000, 1 in Germany.
像1000.1这样的十进制数字在美国应该显示成1,000.1，而在德国会显示成1.000,1。
A decimal number such as 1000.1 should be displayed as 1,000.1 in the U.S. but as 1.000, 1 in Germany.
像1000.1这样的十进制数字在美国应该显示成1,000.1，而在德国会显示成1.000,1。
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