How to Format a Number with a Comma in Oracle

When you use the TO_CHAR() function to format a number in Oracle, you use a format model to determine how the number should be formatted.

For example, you could format a number like 12,345.00 or like 12.345,00, depending on your locale.

The format model can include the G or D format elements to add a comma to a number. Which one you use depends on whether you want the comma as a thousands separator, or as a decimal character.

Alternatively, you can use an actual comma character (,) if you prefer, although this method is not locale aware like the G and D format elements are.

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How to Change your Session’s Currency Symbol in Oracle

In Oracle Database, there are a few different NLS parameters that determine how currency is displayed when using functions like TO_CHAR() to format a number as a currency.

  • NLS_CURRENCY specifies the string to use as the local currency symbol for the L number format element.
  • NLS_ISO_CURRENCY determines what to use for the C format element.
  • NLS_DUAL_CURRENCY specifies what to use for the U format element.

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How to Format Numbers in PostgreSQL

When working with Postgres, you can use the to_char() function to output numbers in a given format.

The way it works is that you provide two arguments. The first argument is the number to be formatted. The second argument determines how it is formatted.

The return value is text.

Depending on your requirements, you might prefer to convert the number to the appropriate data type, for example using the cast() function.

Examples of both methods are below.

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