SQL updates lowercase letters to uppercase.

In order to update lowercase letters to uppercase in an SQL database, you can use the built-in function UPPER().

Here is an example demonstrating how to use the UPPER() function to convert lowercase letters in the “name” column of the “customers” table to uppercase.

UPDATE customers
SET name = UPPER(name);

In the example above, the UPDATE statement is used to update data in the “customers” table. The SET keyword specifies the columns to be updated, and it uses the UPPER() function to convert the lowercase letters in that column to uppercase. The UPPER() function converts all lowercase letters in the string parameter to uppercase and returns the result.

Please note that the example above only updates the “name” column in the “customers” table. Depending on your specific situation, you may need to adjust the table name, column names, and conditions to meet your needs.