Can we give underscore in a MySQL table name?

You cannot give underscore in table name. If you still want to create a new table with underscore, surround it using backticks, not single quotes.

However, let us first try to set quotes around a table name with underscore. Following is an example −

mysql> create table 'Demo_Table725'(    ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    ClientName varchar(100),    ClientAge int,    ClientCountryName varchar(100),    isMarried boolean );

This will produce the following output i.e. an error since we haven’t used backtick −

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''Demo_Table725' ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName v' at line 1

Now, we will fix the above and create the same table with backtick −

mysql> create table `Demo_Table725`(    ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    ClientName varchar(100),    ClientAge int,    ClientCountryName varchar(100),    isMarried boolean ); Query OK, 0 rows affected (0.58 sec)

Insert some records in the table using insert command −

mysql> insert into `Demo_Table725`(ClientName,ClientAge,ClientCountryName,isMarried) values('John',34,'US',true); Query OK, 1 row affected (0.40 sec) mysql> insert into `Demo_Table725`(ClientName,ClientAge,ClientCountryName,isMarried) values('Chris',28,'UK',false); Query OK, 1 row affected (0.25 sec)

Display all records from the table using select statement −

mysql> select *from `Demo_Table725`;

This will produce the following output -

+----------+------------+-----------+-------------------+-----------+ | ClientId | ClientName | ClientAge | ClientCountryName | isMarried | +----------+------------+-----------+-------------------+-----------+ | 1        | John       | 34 | US | 1 | | 2        | Chris     | 28 | UK | 0 | +----------+------------+-----------+-------------------+-----------+ 2 rows in set (0.00 sec)