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\n

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8.2. 货币类型

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\n
\n

\n
\n
\n
\n

money 类型以固定的小数精度存储货币金额；参见表 8.3。小数精度由数据库的lc_monetary设置决定。表中显示的范围假定有两位小数。输入支持多种格式，包括整数字面量和浮点数字面量，以及典型的货币格式，例如 '$1,000.00'。输出通常也采用后一种形式，但会受到区域设置影响。

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表 8.3. 货币类型

\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
名字存储大小说明范围
money8 字节货币额-92233720368547758.08 到 +92233720368547758.07
\n
\n

\n

此类型的输出受区域设置影响，因此将 money 数据加载到 lc_monetary 不同的数据库中可能失败。为避免问题，在向新数据库恢复转储前，应确保 lc_monetary 与源数据库的设置相同或等价。

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数据类型numeric、int和bigint的值可以转换为money。从数据类型real和double precision的转换可以通过先转换为numeric来实现，例如：

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SELECT '12.34'::float8::numeric::money;\n
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但是，我们不推荐这样做。浮点数不应该被用来处理货币，因为浮点数可能会有舍入误差。

\n

一个money值可以在不损失精度的情况下转换为numeric。转换到其他类型可能会丢失精度，并且必须采用两个阶段完成：

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SELECT '52093.89'::money::numeric::float8;\n
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一个 money 值除以一个整数值时，会朝零方向截去小数部分。要得到舍入后的结果，可以除以一个浮点值，或者在除法前先把 money 转换为 numeric，再在除法后转换回 money（如果要避免精度丢失风险，后一种做法更好）。当一个 money 值被另一个 money 值除时，结果是 double precision（即一个纯数字，而不是金额），因为在除法中货币单位被约掉了。

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