Use MySQL CONCAT and LOWER Effectively

The contact() method is used to concatenate. However, lower() is used to change the case to lowercase. For our example, let us create a table.

The query to create a table is as follows

mysql> create table concatAndLowerDemo
   -> (
   -> FirstValue varchar(10),
   -> SecondValue varchar(10),
   -> ThirdValue varchar(10),
   -> FourthValue varchar(10)
   -> );
Query OK, 0 rows affected (0.55 sec)

Now you can insert some records in the table using insert command.

The query is as follows

mysql> insert into concatAndLowerDemo values('John','12345','Java','MySQL');
Query OK, 1 row affected (0.21 sec)
mysql> insert into concatAndLowerDemo values('Hi','12345','98764','MongoDB');
Query OK, 1 row affected (0.24 sec)
mysql> insert into concatAndLowerDemo values('9485','746464','903940','cpp');
Query OK, 1 row affected (0.15 sec)

Display all records from the table using select statement.

The query is as follows

mysql> select *from concatAndLowerDemo;

The following is the output

+------------+-------------+------------+-------------+
| FirstValue | SecondValue | ThirdValue | FourthValue |
+------------+-------------+------------+-------------+
| John       | 12345       | Java       | MySQL       |
| Hi         | 12345       | 98764      | MongoDB     |
| 9485       | 746464      | 903940     | cpp         |
+------------+-------------+------------+-------------+
3 rows in set (0.00 sec)

Here is the query to use concat() and lower() in the same query

mysql> select lower(concat(FirstValue,SecondValue,ThirdValue,FourthValue)) AS lowerDemo from concatAndLowerDemo;

The following is the output

+---------------------+
| lowerDemo           |
+---------------------+
| john12345javamysql  |
| hi1234598764mongodb |
| 9485746464903940cpp |
+---------------------+
3 rows in set (0.00 sec)