Is there any example for real project where field of deciamal type been used?

Question

Drupal has several types of numeric fields:

• integer
• float
• decimal

I know, that decimal field is used to store numeric data with high accuracy. But when it may be necessary in real project? Are there any good examples?

Answer 1

Here's a link to an explanation of Drupal's different number types (integer vs. decimal vs. float) with some examples. Basically, it breaks down as follows:

• Integer: You're storing numbers without fractional digits (e.g. a field that stores a product stock quantity, XX units)
• Decimal: You're storing numbers with a fixed amount of fractional digits. (e.g. a field that stores a price, $XXX.YY)
• Float: You're storing numbers with a variable amount of fractional digits. (e.g. a field that stores latitude/longitude coordinates, XX.XXXXXXX..., YY.YYYYY...)

Also of note is the underlying data structures of integer/decimal/float that gets stored in the database. See Fixed point vs. Floating point for some discussion on the differences.