If a negative number is specified for the number of digits, the number will be rounded to the specified digit(the order of 1 is 0)on the left side(integer part) of the decimal point.
When you require only the integer part in values gained from calculations involving divisions, you should use the FLOOR() function to obtain the integer part.
For example, a DECIMAL(18,9) column has 9 digits on each side of the decimal point,so the integer part and the fractional part each require 4 bytes.
例4:翻訳の共通端に小数場合は小数点以下の桁数を含む整数部分に変換する混合数、小数部分の最前。
Example 4:Translate a common fraction into a decimal If the decimal contains a integer part, convert it into a mixed number and a fractional part of the record before.
To convert a mixed number to an improper fraction, you must:multiply the integer portion by the denominator of the fractional part; to the product add the numerator of the fractional part; to record amount received by the numerator, and the denominator of the fractional part to leave without change.
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