On 2023-07-15 12:08:26 +0530, Priyank Rajvansh wrote: > Page: https://www.postgresql.org/docs/15/datatype-numeric.html > Description: > > article 8.1.2 states the following: > > ''We use the following terms below: The precision of a numeric is the total > count of significant digits in the whole number, that is, the number of > digits to both sides of the decimal point. The scale of a numeric is the > count of decimal digits in the fractional part, to the right of the decimal > point. So the number 23.5141 has a precision of 6 and a scale of 4. Integers > can be considered to have a scale of zero.'' > > however it also states the following towards the end: > > '' For example, a column declared as > > NUMERIC(3, 5) > will round values to 5 decimal places and can store values between -0.00999 > and 0.00999, inclusive.'' > > Now from whatever i could decipher the syntax of the numeric data type is > NUMERIC(precision,scale) and if we write NUMERIC (3,5) it would mean that we > are trying to store a number which has 3 digits in total and 5 of them are > to the right of the decimal point, which doesn't make sense ! It may sound weird but it does make sense. There are three digits in the number and the rightmost of them is five positions to the right of the decimal pointis. So you can store 0.00999 --12345 but not 0.01000 --12345 as that would need a fourth digit and also not 0.000123 --123456 as not the rightmost digit is now six places right of the decimal point. Mathematically you store an integer with 3 digits and multiply it with 10^-5 to get the value. hp -- _ | Peter J. Holzer | Story must make more sense than reality. |_|_) | | | | | hjp@xxxxxx | -- Charles Stross, "Creative writing __/ | http://www.hjp.at/ | challenge!"
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