How to concatenate all columns in MySQL?

First, you need to know how many columns are present in a table. Following is the syntax to know the column names −

show columns from yourTableName;

Following is the syntax to concatenate all columns −

select concat(yourColumnName1,yourColumnName2,yourColumnName3,........N) from yourTableName;

Let us first create a table −

mysql> create table DemoTable
   (
   CustomerId int,
   CustomerName varchar(20),
   CustomerAge int
   );
Query OK, 0 rows affected (0.66 sec)

Following is the query to know the exact column −

mysql> show columns from DemoTable;

This will produce the following output −

+--------------+-------------+------+-----+---------+-------+
| Field        | Type        | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+-------+
| CustomerId   | int(11)     | YES  |     | NULL    |       |
| CustomerName | varchar(20) | YES  |     | NULL    |       |
| CustomerAge  | int(11)     | YES  |     | NULL    |       |
+--------------+-------------+------+-----+---------+-------+
3 rows in set (0.00 sec)

Insert records in the table using insert command −

mysql> insert into DemoTable values(101,'Chris',26);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values(102,'Robert',27);
Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable;

This will produce the following output −

+------------+--------------+-------------+
| CustomerId | CustomerName | CustomerAge |
+------------+--------------+-------------+
| 101        | Chris        | 26          |
| 102        | Robert       | 27          |
+------------+--------------+-------------+
2 rows in set (0.00 sec)

Following is the query to concat all columns −

mysql> select concat(CustomerId,CustomerName,CustomerAge) from DemoTable;

This will produce the following output −

+---------------------------------------------+
| concat(CustomerId,CustomerName,CustomerAge) |
+---------------------------------------------+
| 101Chris26                                  |
| 102Robert27                                 |
+---------------------------------------------+
2 rows in set (0.00 sec)