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review datatype section 1.
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postgresql/doc/src/sgml/datatype.sgml

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</para>
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<para>
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数值类型由 2 、4 8 字节的整数以及 4 8 字节的浮点数和可选精度的小数组成
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数值类型由 2 字节、4 字节或 8 字节的整数以及 4 字节或 8 字节的浮点数和可选精度的十进制数组成
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<xref linkend="datatype-numeric-table">列出了所有可用类型。
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</para>
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<entry>Range</entry>
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<entry>名字</entry>
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<entry>存储空间</entry>
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<entry>存储长度</entry>
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<entry>描述</entry>
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<entry>范围</entry>
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</row>
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<entry>user-specified precision, exact</entry>
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<entry>up to 131072 digits before the decimal point; up to 16383 digits after the decimal point</entry>
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-->
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<entry>变长</entry>
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<entry>用户声明精度,精确</entry>
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<entry>可变长</entry>
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<entry>用户指定的精度,精确</entry>
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<entry>小数点前 131072 位;小数点后 16383 位</entry>
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</row>
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<row>
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<entry>user-specified precision, exact</entry>
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<entry>up to 131072 digits before the decimal point; up to 16383 digits after the decimal point</entry>
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-->
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<entry>变长</entry>
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<entry>用户声明精度,精确</entry>
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<entry>可变长</entry>
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<entry>用户指定的精度,精确</entry>
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<entry>小数点前 131072 位;小数点后 16383 位</entry>
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</row>
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<entry>6 decimal digits precision</entry>
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<entry>4 字节</entry>
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<entry>变精度,不精确</entry>
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<entry>可变精度,不精确</entry>
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<entry>6 位十进制数字精度</entry>
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</row>
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<row>
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<entry><type>double precision</></entry>
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<entry>8 字节</entry>
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<entry>变精度,不精确</entry>
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<entry>可变精度,不精确</entry>
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<entry>15 位十进制数字精度</entry>
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</row>
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<row>
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<entry><type>smallserial</type></entry>
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<entry>2 字节</entry>
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<entry>小范围自增整数</entry>
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<entry>自增的小范围整数</entry>
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<entry>1 到 32767</entry>
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</row>
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<row>
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<entry><type>bigserial</type></entry>
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<entry>8 字节</entry>
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<entry>大范围自增整数</entry>
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<entry>自增的大范围整数</entry>
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<entry>1 到 9223372036854775807</entry>
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</row>
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</tbody>

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