How to implement case conversion in oracle

As a data storage and management tool, Oracle database has built-in multiple data types and related conversion functions. The case conversion function is one of the very practical functions, especially for users who need to process large amounts of data.

The case conversion function is used to convert all characters in a string to uppercase or lowercase. Its most basic syntax is:

UPPER(expression)    --转换为大写
LOWER(expression)    --转换为小写

where expression is the string or string column that needs to be converted. When using it, we just need to replace it with the actual value.

Below, we use some examples to learn more about its usage and effects.

Convert characters in string

Suppose we have the following string:

SELECT 'felixhoo IS GReaT!' "Original String"
FROM dual;

After running, we can get a string containing mixed case:

Original String
felixhoo IS GReaT!

Next, we use the UPPER function to convert all characters in it to uppercase:

SELECT UPPER('felixhoo IS GReaT!') "To Uppercase"
FROM dual;

After running, we can get:

To Uppercase
FELIXHOO IS GREAT!

Similarly, if we want to convert all characters in it is lowercase, you can use the LOWER function:

SELECT LOWER('felixhoo IS GReaT!') "To Lowercase"
FROM dual;

The result is:

To Lowercase
felixhoo is great!

Convert the characters in the table column

In addition to converting the string itself, we also Data in table columns can be transformed through SQL statements.

For example, we have a table containing multiple names:

SELECT * FROM Names;

After running, we can get the following results:

ID  Name
1   FelixHoo
2   aliceWONDER
3   TomBaker

Now, we want to add all the names in it The first letter becomes capitalized. To achieve this functionality we need to use the INITCAP function. This function changes the first letter of each word in a string to uppercase and other letters to lowercase.

SELECT ID, INITCAP(Name) "New Name" FROM Names;

After running, we can get the following results:

ID  New Name
1   Felixhoo
2   Alicewonder
3   Tombaker

As you can see, the function successfully changed the first letters of all names to uppercase.

Summary

Through the explanation of this article, we have learned the basic syntax and usage of the case conversion function in Oracle database. These functions can simplify our data processing, enable us to analyze and manage data more effectively, and make more informed decisions based on this.

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