MySQL Query to change lower case to upper case?

You can use in-built function UPPER() from MySQL to change a lower case to upper case. The syntax is as follows with select statement.

SELECT UPPER(‘yourStringValue’);

The following is an example showing string in lower case −

mysql> select upper('john');

Here is the output displaying string in upper case −

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

If you already have a table with a lower case value, then you can use the UPPER() function with update command. The syntax is as follows −

UPDATE yourTableName set yourColumnName = UPPER(yourColumnName);

To understand the above concept, let us first create a table and insert string values in lowercase. The following is the query to create a table −

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

Insert some records in the table using INSERT command. 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)

Display all records from the table using select statement. 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)

The following is the query to change the lower case to upper case −

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

Display all records again with updated value. 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)