oracle number conversion string

Oracle database is a widely used relational database management system. In Oracle, converting numbers and strings to and from each other is a common operation. The process of converting numbers to strings requires the use of two functions: TO_CHAR and CAST functions.

TO_CHAR function is the most basic way to convert numbers to strings in Oracle. The syntax format of this function is as follows:

TO_CHAR(number,[format_mask],[nls_language])

Among them, number represents the number to be converted, format_mask represents the template for the conversion format, and nls_language represents the conversion The locale used.

For example, to convert the number 100 to a string, you can use the following command:

SELECT TO_CHAR(100) FROM dual;

The return result of this command is a string "100".

When using the TO_CHAR function, if you want to specify the conversion format of the number, you can use the format_mask parameter. The format template specified by this parameter can be any of the following formats:

1. $: Add a dollar sign before the number.
2. 9: Display a number, or a space if the digit does not exist.
3. 0: Displays a number, if the bit does not exist, 0 is displayed.
4. D: Display currency symbol.
5. L: Displays the position of the currency symbol (in front or behind).
6. .: Decimal separator.
7. ,: thousands separator.
8. E: Scientific notation.

For example, to convert the number 100 to a string with two decimal places, you can use the following command:

SELECT TO_CHAR(100, 'FM999.00') FROM dual ;

The return result of this command is the string "100.00".

In addition to the TO_CHAR function, you can also use the CAST function to convert numbers to strings. The syntax format of the CAST function is as follows:

CAST(number AS varchar2(length))

where number represents the number to be converted, varchar2 represents the string type to be converted to, and length represents the character The length of the string.

For example, to convert the number 100 to a string, you can use the following command:

SELECT CAST(100 AS varchar2(10)) FROM dual;

The command The return result is the string "100".

In short, converting numbers to strings in Oracle is a basic operation, and the TO_CHAR function and the CAST function are two commonly used methods. Although the syntax format of these functions is different, they all can complete the task of converting numbers to strings very well.

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