Derby对实数提供了多种格式的支持：单精度浮点、双精度浮点以及准确的算术表示，如表2所示。
Derby provides support for real Numbers in several formats: single-precision floating-point, double-precision floating-point, and an exact representation decimal, as presented in Table 2.
即使到目前为止您已经执行了所有操作，但您仍然没有足够的信息来计算该解析树表示的算术运算的结果。
With everything you've done so far, however, you still don't have quite enough information to calculate the results of the arithmetic operation represented by this parse tree.
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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