Updating multiple rows in mysql

Posted by / 25-Aug-2017 02:19

As we explained earlier, a TIMESTAMP field shows the value when the record was inserted or last modified.SELECT * FROM Books TBL; -------- ----------------------------------------- ---------- ----------- --------------------- ----------------- | Book ID | Book Name | Author ID | Book Price | Book Last Updated | Book Is Available | -------- ----------------------------------------- ---------- ----------- --------------------- ----------------- | 1 | And Then There Were None | 1 | 14.95 | 2016-10-01 | 1 | | 2 | The Man in the Brown Suit | 1 | 23.99 | 2016-10-01 | 1 | | 3 | The Stand | 2 | 35.99 | 2016-10-01 | 1 | | 4 | Pet Sematary | 2 | 17.95 | 2016-10-01 | 0 | | 5 | The Green Mile | 2 | 29.99 | 2016-10-01 | 1 | | 6 | The Alchemist | 3 | 25.00 | 2016-10-01 | 1 | | 7 | By the River Piedra I Sat Down and Wept | 3 | 18.95 | 2016-10-01 | 0 | -------- ----------------------------------------- ---------- ----------- --------------------- ----------------- 7 rows in set (0.00 sec) Maria DB [Bookstore DB] SELECT * FROM Books TBL WHERE Book ID=6; -------- --------------- ---------- ----------- --------------------- ----------------- | Book ID | Book Name | Author ID | Book Price | Book Last Updated | Book Is Available | -------- --------------- ---------- ----------- --------------------- ----------------- | 6 | The Alchemist | 3 | 22.75 | 2016-10-01 | 1 | -------- --------------- ---------- ----------- --------------------- ----------------- 1 row in set (0.00 sec) Maria DB [Bookstore DB] Although we won’t do it here, you can also delete a record if not used anymore.If UNSIGNED is specified, negative values are not be allowed.After having reviewed these data types, you will be in a better position to determine which data type you need to assign to a given column in a table.Particularly, Maria DB is a relational database management system (RDBMS) and uses the Structure Query Language to perform operations on databases.Additionally, keep in mind that Maria DB uses the terms database and schema interchangeably.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.

Often, two or more tables will be related to each other in some way.

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) [[email protected] ~]# mysql -u bookstoreuser -p Enter password: Welcome to the Maria DB monitor. Your Maria DB connection id is 3 Server version: 10.1.14-Maria DB Maria DB Server Copyright (c) 2000, 2016, Oracle, Maria DB Corporation Ab and others. Additionally, we shared a few tips that may make your life as a system / database administrator easier.

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

Otherwise, you run the risk of deleting all the rows in the table!

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The most common data types in Maria DB are the following (you can consult the complete list in the official Maria DB online documentation): Note: In TINYINT, SMALLINT, and INT, the default SIGNED is assumed.

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