Question

I want to know what is the maximum value the number-format?
For example int32 can handle 4.294.967.296 values.

Answer 1

Based on this Oracle’s documentation:

The NUMBER datatype stores fixed and floating-point numbers. Numbers
of virtually any magnitude can be stored and are guaranteed portable
among different systems operating Oracle, up to 38 digits of
precision.

The following numbers can be stored in a NUMBER column:

• Positive numbers in the range 1 x 10^-130 to 9.99..9 x 10¹²⁵ with up to 38 significant digits
• Negative numbers from -1 x 10^-130 to 9.99..99 x
  10¹²⁵ with up to 38 significant digits
• Zero
• Positive and negative infinity (generated only by importing from an Oracle Version 5 database)

There’s also this other documentation which summarizes very well the types and precision for numeric and other data types as well.