If we want to manage a database in MySQL, it is required to see the list of all user’s accounts in a database server. The following command is used to check the list of all users available in the database server: mysql> SELECT USER FROM mysql.user; To check the users in MySQL, you can use the following SQL query: SELECT User, Host FROM mysql.user; This will retrieve a list of users along with their corresponding hostnames from the MySQL user…
A USER in MySQL is a record in the USER-TABLE. It contains the login information, account privileges, and the host information for MySQL account to access and manage the databases. We can create a new user account in the database server using the MySQL Create User statement. It provides authentication, SSL/TLS, resource-limit, role, and password management properties for the new accounts. The following is the basic syntax to create a new user in MySQL: CREATE USER [IF NOT EXISTS] account_name…
If we use MySQL in Windows, it is not possible to clear the screen before version 8. At that time, the Windows operating system provides the only way to clear the screen by exiting the MySQL command-line tool and then again open MySQL. After the release of MySQL version 8, we can use the below command to clear the command line screen: mysql> SYSTEM CLS;
A trigger is a procedural code in a database that automatically invokes whenever certain events on a particular table or view in the database occur. It can be executed when records are inserted into a table, or any columns are being updated. We can create a trigger in MySQL using the syntax as follows: CREATE TRIGGER trigger_name [before | after] {insert | update | delete} ON table_name [FOR EACH ROW] BEGIN –variable declarations –trigger code END;
A view is a database object whose values are based on the base table. It is a virtual table created by a query by joining one or more tables. It is operated similarly to the base table but does not contain any data of its own. If any changes occur in the underlying table, the same changes reflected in the View also. Following is the general syntax of creating a VIEW in MySQL: CREATE [OR REPLACE] VIEW view_name AS SELECT…
We can execute a stored procedure in MySQL by simply CALL query. This query takes the name of the stored procedure and any parameters we need to pass to it. The following is the basic syntax to execute a stored procedure: CALL stored_procedure_name (argument_list); Let’s understand it with this example: CALL Product_Pricing (@pricelow, @pricehigh); Here, a stored procedure named Product_Pricing calculates and returns the lowest and highest product prices.
A stored procedure is a group of SQL statements that we save in the database. The SQL queries, including INSERT, UPDATE, DELETE, etc. can be a part of the stored procedure. A procedure allows us to use the same code over and over again by executing a single statement. It stores in the database data dictionary. We can create a stored procedure using the below syntax: CREATE PROCEDURE procedure_name [ (parameter datatype [, parameter datatype]) ] BEGIN Body_section of SQL…
MySQL primary key is a single or combination of the field used to identify each record in a table uniquely. A primary key column cannot be null or empty. We can remove or delete a primary key from the table using the ALTER TABLE statement. The following syntax is used to drop the primary key: ALTER TABLE table_name DROP PRIMARY KEY;
MySQL Workbench is a unified visual database designing or GUI tool used for working on MySQL databases. It is developed and maintained by Oracle that provides SQL development, data migration, and comprehensive administration tools for server configuration, user administration, backup, etc. We can use this Server Administration to create new physical data models, E-R diagrams, and SQL development. It is available for all major operating systems. MySQL provides supports for it from MySQL Server version v5.6 and higher. It is…
We can update existing records in a table using the UPDATE statement that comes with the SET and WHERE clauses. The SET clause changes the values of the specified column. The WHERE clause is optional, which is used to specify the condition. This statement can also use to change values in one or more columns of a single row or multiple rows at a time. Following is a generic syntax of UPDATE command to modify data into the MySQL table:…