MySQL query to change lowercase to uppercase?

You can change lowercase letters to uppercase letters using MySQL's built-in function UPPER(). The syntax is as follows, with select statements.

SELECT UPPER(‘yourStringValue’);

The following is an example to display a string in lowercase -

mysql> select upper('john');

This is the output to display a string in uppercase -

+---------------+
| upper('john') |
+---------------+
| JOHN          |
+---------------+
1 row in set (0.00 sec)

If you already have a string with lowercase values table, you can use the UPPER() function with the update command. The syntax is as follows -

UPDATE yourTableName set yourColumnName = UPPER(yourColumnName);

To understand the above concept, we first create a table and insert lowercase string values. Following is the query to create the table -

mysql> create table UpperTableDemo
   −> (
   −> BookName longtext
   −> );
Query OK, 0 rows affected (0.70 sec)

Use INSERT command to insert some records in the table. The query is as follows -

mysql> insert into UpperTableDemo values('introduction to c');
Query OK, 1 row affected (0.13 sec)

mysql> insert into UpperTableDemo values('introduction to java');
Query OK, 1 row affected (0.18 sec)

mysql> insert into UpperTableDemo values('introduction to python');
Query OK, 1 row affected (0.11 sec)

mysql> insert into UpperTableDemo values('introduction to c#');
Query OK, 1 row affected (0.17 sec)

Use the select statement to display all records in the table. The query is as follows -

mysql> select *from UpperTableDemo;

Below is the output -

+------------------------+
| BookName               |
+------------------------+
| introduction to c      |
| introduction to java   |
| introduction to python |
| introduction to c#     |
+------------------------+
4 rows in set (0.00 sec)

Below is the query to change lowercase to uppercase -

mysql> update UpperTableDemo set BookName = upper(BookName);
Query OK, 4 rows affected (0.16 sec)
Rows matched: 4 Changed: 4 Warnings: 0

Display all the records again and update the values. The query is as follows -

mysql> select *from UpperTableDemo;

The following is the output -

+------------------------+
| BookName               |
+------------------------+
| INTRODUCTION TO C      |
| INTRODUCTION TO JAVA   |
| INTRODUCTION TO PYTHON |
| INTRODUCTION TO C#     |
+------------------------+
4 rows in set (0.00 sec)

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