How to convert string to number in oracle

Oracle provides multiple methods to convert strings to numbers: TO_NUMBER function: Convert strings to numeric types using the specified format model. NUMTOSTR function: Converts a string to a numeric type and back to a string. VAL function: directly converts a string to a numeric type without checking the format.

How to convert a string to a number

Convert a string to a number in Oracle

Oracle provides a variety of methods to convert strings to numbers:

1. TO_NUMBER function

TO_NUMBER function converts strings to numeric types . It has the following syntax:

<code>TO_NUMBER(string, format_model)</code>

Where:

• string: The string to convert.
• format_model (optional): Specifies the format model for string number format.

For example:

<code>SELECT TO_NUMBER('12345') FROM dual;</code>

Output:

<code>12345</code>

2. NUMTOSTR function

NUMTOSTR The function converts a string to a numeric type and converts the result to a string. It has the following syntax:

<code>NUMTOSTR(string)</code>

Where:

• string: The string to convert.

For example:

<code>SELECT NUMTOSTR('12345') FROM dual;</code>

Output:

<code>12345</code>

3. VAL function

VAL The function converts a string to a numeric type, but unlike the TO_NUMBER function, it does not perform any format checking. It has the following syntax:

<code>VAL(string)</code>

Where:

• string: The string to convert.

For example:

<code>SELECT VAL('12345X') FROM dual;</code>

Output:

<code>12345</code>

Note: VAL function for characters that contain non-numeric characters Strings may be unreliable. In this case, it is better to use the TO_NUMBER function.

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