MySQL GROUP BY and CONCAT() to display distinct first and last name

Let us first create a table −

mysql> create table DemoTable
(
   FirstName varchar(100),
   LastName varchar(100)
);
Query OK, 0 rows affected (0.92 sec)
mysql> alter table DemoTable add index(FirstName,LastName);
Query OK, 0 rows affected (1.00 sec)
Records: 0 Duplicates: 0 Warnings: 0

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Adam','Smith');
Query OK, 1 row affected (0.73 sec)
mysql> insert into DemoTable values('Adam','Smith');
Query OK, 1 row affected (1.17 sec)
mysql> insert into DemoTable values('John','Doe');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values('Carol','Taylor');
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable values('John','Doe');
Query OK, 1 row affected (0.66 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-----------+----------+
| FirstName | LastName |
+-----------+----------+
| Adam      | Smith    |
| Adam      | Smith    |
| Carol     | Taylor   |
| John      | Doe      |
| John      | Doe      |
+-----------+----------+
5 rows in set (0.00 sec)

Following is the query to combine distinct First and Last Name −

mysql> select concat(FirstName,' ',LastName) as combinedName from DemoTable
group by LastName,FirstName;

This will produce the following output −

+--------------+
| combinedName |
+--------------+
| Adam Smith   |
| Carol Taylor |
| John Doe     |
+--------------+
3 rows in set (0.00 sec)

AmitDiwan

Published on 25-Sep-2019 11:29:59

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