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MySQL query to change lowercase to uppercase?

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Release： 2023-09-05 13:25:02

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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(&lsquo;yourStringValue&rsquo;);

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

mysql> select upper(&#39;john&#39;);

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This is the output to display a string in uppercase -

+---------------+
| upper(&#39;john&#39;) |
+---------------+
| JOHN          |
+---------------+
1 row in set (0.00 sec)

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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);

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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
   &minus;> (
   &minus;> BookName longtext
   &minus;> );
Query OK, 0 rows affected (0.70 sec)

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

mysql> insert into UpperTableDemo values(&#39;introduction to c&#39;);
Query OK, 1 row affected (0.13 sec)

mysql> insert into UpperTableDemo values(&#39;introduction to java&#39;);
Query OK, 1 row affected (0.18 sec)

mysql> insert into UpperTableDemo values(&#39;introduction to python&#39;);
Query OK, 1 row affected (0.11 sec)

mysql> insert into UpperTableDemo values(&#39;introduction to c#&#39;);
Query OK, 1 row affected (0.17 sec)

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

mysql> select *from UpperTableDemo;

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Below 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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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

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

mysql> select *from UpperTableDemo;

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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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