SQL modes that control how strict the server is about accepting or rejecting invalid data.控制服务器接受或拒绝无效数据的严格程度的SQL模式。

The MySQL library for fixed-point arithmetic.定点算法的MySQL库。

Precise calculations精确计算: For exact-value numbers, calculations do not introduce floating-point errors. ：对于精确值数字，计算不会引入浮点错误。Instead, exact precision is used. For example, MySQL treats a number such as .0001 as an exact value rather than as an approximation, and summing it 10,000 times produces a result of exactly 1, not a value that is merely “close” to 1.取而代之的是精确的精度。例如，MySQL将.0001等数字视为精确值而不是近似值，将其相加10000次将得到精确的1，而不是仅仅“接近”1的值。

Well-defined rounding behavior明确的舍入行为: For exact-value numbers, the result of ROUND() depends on its argument, not on environmental factors such as how the underlying C library works.：对于精确的数值，ROUND()的结果取决于它的参数，而不是环境因素，例如底层C库的工作方式。

Platform independence平台独立性: Operations on exact numeric values are the same across different platforms such as Windows and Unix.：在不同的平台（如Windows和Unix）上，对精确数值的操作是相同的。

Control over handling of invalid values对无效值处理的控制: Overflow and division by zero are detectable and can be treated as errors. ：溢出和被零除是可检测的，可以视为错误。For example, you can treat a value that is too large for a column as an error rather than having the value truncated to lie within the range of the column's data type. 例如，可以将对某列来说太大的值视为错误，而不是将该值截断为在该列的数据类型范围内。Similarly, you can treat division by zero as an error rather than as an operation that produces a result of NULL. 类似地，您可以将被零除视为错误，而不是产生NULL结果的操作。The choice of which approach to take is determined by the setting of the server SQL mode.选择哪种方法取决于服务器SQL模式的设置。