How to calculate string type numbers in oracle

In Oracle, string type numbers can be converted to numbers through the CAST or TO_NUMBER function, and then mathematical operations can be performed. When converting, be careful to ensure that all strings have been converted to numbers to avoid errors. Oracle also provides other functions, such as SUBSTR and INSTR, to operate on string-type numbers.

How to calculate string type numbers in Oracle

The string type in Oracle database can Stores a numeric value. However, when doing math operations, these strings need to be converted to numeric types.

Convert string to number

There are two ways to convert a string to number:

• CAST function: For example, CAST('123' AS NUMBER) Converts the string "123" to the number 123.
• TO_NUMBER function: For example, TO_NUMBER('123') can also convert the string "123" to the number 123.

Performing Mathematical Operations

Once strings are converted to numbers, you can perform mathematical operations on them just like you would with ordinary numbers. For example:

• SELECT 10 '123' FROM DUAL; will return 133.
• SELECT 10 * TO_NUMBER('123') FROM DUAL; will also return 133.

Note:

• Be sure all strings have been converted to numbers before doing math operations.
• If the string contains non-numeric characters, the conversion will fail and may result in an error.
• Oracle also provides some built-in functions to operate on string type numbers, such as SUBSTR and INSTR.

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