How to convert case in Oracle database

Oracle is a mainstream database management system used to access, manage and process large amounts of data. In Oracle database, data can be converted to uppercase or lowercase. The following describes how to convert uppercase and lowercase letters in Oracle database.

First of all, Oracle database provides two functions for converting strings to all uppercase or all lowercase. These functions are UPPER() and LOWER() respectively. Here's how they are used:

UPPER(string)

This function converts all letters in the string passed to it to uppercase letters and returns the converted string. For example, if the string passed is "Oracle Convert Case", the function will return "ORACLE CONVERT CASE".

LOWER(string)

This function converts all letters in the string passed to it to lowercase letters and returns the converted string. For example, if the string passed is "Oracle Convert Case", the function will return "oracle convert case".

In actual use, these functions can be used together with other functions. For example, suppose you need to convert the value of a column in a table to uppercase in a SELECT statement. The following query can be used:

SELECT UPPER(column_name) FROM table_name;

This will return all values ​​in the specified column in the table and convert them to uppercase letters.

In addition, Oracle also provides an INITCAP() function, which converts the first letter of each word in the string passed to it to uppercase letters and returns the converted string. For example, if the string passed is "oracle convert case", the function will return "Oracle Convert Case".

Similar to the UPPER() and LOWER() functions, the INITCAP() function can also be used with other functions. For example, suppose you need to convert the values ​​of a column in a table so that the first letter of each word is capitalized in a SELECT statement. You can use the following query:

SELECT INITCAP(column_name) FROM table_name;

This will return all values ​​in the specified column in the table and convert them to a string with the first letter capitalized.

In general, converting case in Oracle database is very simple. Just use the UPPER(), LOWER() or INITCAP() function and pass them the string you want to convert as a parameter. You can use these functions with other functions to perform more complex string operations.

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