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If you desire to concatenate two (or more) fields, you can use the CONCAT statement.

For example, let’s say we want to return a result set that consist of one field with the book name and author in the form of “The Alchemist (Paulo Coelho)” and another column with the price.

The output of the above query is shown in the below image: SELECT CONCAT(Books TBL. To avoid this, we can create a new Maria DB user account (we’ll name it bookstoreuser) and assign all necessary permissions for Bookstore DB: Having a dedicated, separate user for each database will prevent damages to the entire database should a single account become compromised. Maria DB [Bookstore DB] The following image shows the result of the above command after accessing the Maria DB prompt as the bookstoreuser (note how this account can’t “see” any databases other than Bookstore DB and information_schema (available for all users): In this article we have explained how to run DML operations and how to create a database, tables, and dedicated users on a Maria DB database.

To clear up the Maria DB prompt, type the following command and press Enter: SHOW COLUMNS IN Books TBL; ----------------- -------------- ------ ----- ------------------- ----------------------------- | Field | Type | Null | Key | Default | Extra | ----------------- -------------- ------ ----- ------------------- ----------------------------- | Book ID | int(11) | NO | PRI | NULL | auto_increment | | Book Name | varchar(100) | NO | | NULL | | | Author ID | int(11) | NO | MUL | NULL | | | Book Price | decimal(6,2) | NO | | NULL | | | Book Last Updated | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP | | Book Is Available | tinyint(1) | YES | | NULL | | ----------------- -------------- ------ ----- ------------------- ----------------------------- 6 rows in set (0.02 sec)

You’ll also noticed that we chose the alias Description to represent the result set of the concatenation. Book Price FROM Authors TBL JOIN Books TBL ON Authors TBL. Author ID; -------------------------------------------------------- ----------- | Description | Book Price | -------------------------------------------------------- ----------- | And Then There Were None (Agatha Christie) | 14.95 | | The Man in the Brown Suit (Agatha Christie) | 23.99 | | The Stand (Stephen King) | 35.99 | | Pet Sematary (Stephen King) | 17.95 | | The Green Mile (Stephen King) | 29.99 | | The Alchemist (Paulo Coelho) | 25.00 | | By the River Piedra I Sat Down and Wept (Paulo Coelho) | 18.95 | -------------------------------------------------------- ----------- 7 rows in set (0.00 sec) Using root to perform all DML operations in a database is a bad idea.CREATE TABLE Books TBL ( Book ID INT NOT NULL AUTO_INCREMENT, Book Name VARCHAR(100) NOT NULL, Author ID INT NOT NULL, Book Price DECIMAL(6,2) NOT NULL, Book Last Updated TIMESTAMP, Book Is Available BOOLEAN, PRIMARY KEY(Book ID), FOREIGN KEY (Author ID) REFERENCES Authors TBL(Author ID) ); After that, we will select all records from Authors TBL.Remember we will need the Author ID for each record to create the INSERT query for Books TBL.That is part of the organization that characterizes the use of relational databases. Maria DB [(none)] Once the database has been created, we need to create at least two tables on it. As we explained earlier, tables are database objects where we will keep persistent information.To create a new database named [[email protected] ~]# mysql -u root -p Enter password: Welcome to the Maria DB monitor. Your Maria DB connection id is 2 Server version: 10.1.14-Maria DB Maria DB Server Copyright (c) 2000, 2016, Oracle, Maria DB Corporation Ab and others. Each table consists of two or more fields (also known as columns) of a given data type (the type of information) that such field can store.

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Also, don’t forget to add the WHERE clause and a condition (Book ID=6) to select the specific record to be removed.

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