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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