Importing database in MySQL is a process of moving data from one place to another place. It is a very useful method for backing up essential data or transferring our data between different locations. For example, we have a contact book database, which is essential to keep it in a secure place. So we need to export it in a safe place, and whenever it lost from the original location, we can restore it using import options. In MySQL, we…
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…
MySQL is not so efficient for large scale databases. It does not support COMMIT and STORED PROCEDURES functions version less than 5.0. Transactions are not handled very efficiently. The functionality of MySQL is highly dependent on other addons. Development is not community-driven. MySQL, like any technology, has its drawbacks: Limited Functionality: Compared to some other relational databases, MySQL may have limited functionality in terms of features such as stored procedures, triggers, and views. Performance Bottlenecks: In certain scenarios, MySQL may…
SQLyog program is the most popular GUI tool for admin. It is the most popular MySQL manager and admin tool. It combines the features of MySQL administrator, phpMyadmin, and others. MySQL front ends and MySQL GUI tools. SQLyog is not a product developed by MySQL. It is a popular graphical user interface (GUI) tool used to manage MySQL and MariaDB databases. It offers features such as database schema visualization, query building, data synchronization, backup management, and more. It’s developed by…
The SELECT command is used to view the content of the table in MySQL. Explain Access Control Lists. An ACL is a list of permissions that are associated with an object. MySQL keeps the Access Control Lists cached in memory, and whenever the user tries to authenticate or execute a command, MySQL checks the permission required for the object, and if the permissions are available, then execution completes successfully.
How to give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs # mysql -u root -p # mysql -u root -p mysql> use mysql; mysql> INSERT INTO user (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv) VALUES (‘%’,’databasename’,’username’,’Y’,’Y’,’Y’,’Y’,’Y’,’N’); mysql> flush privileges; or mysql> grant all privileges on databasename.* to username@localhost; mysql> flush privileges How to show all records starting with the letters ‘sonia’ AND the phone number ‘9876543210’ limit to records 1 through 5. mysql> SELECT * FROM…
mysql> alter table [table name] drop column [column name]; mysql> alter table [table name] add column [new column name] varchar (20); To delete a column in MySQL, you would use the ALTER TABLE statement followed by the DROP COLUMN keyword. Here’s the syntax: sql ALTER TABLE table_name DROP COLUMN column_name; Replace table_name with the name of your table and column_name with the name of the column you want to delete. To add a new column, you would also use the…
While creating a table, we have kept one of the column names incorrectly. To change or rename an existing column name in MySQL, we need to use the ALTER TABLE and CHANGE commands together. The following are the syntax used to rename a column in MySQL: ALTER TABLE table_name CHANGE COLUMN old_column_name new_column_name column_definition [FIRST|AFTER existing_column]; Suppose the column’s current name is S_ID, but we want to change this with a more appropriate title as Stud_ID. We will use the…
MySQL allows us to import the CSV (comma separated values) file into a database or table. A CSV is a plain text file that contains the list of data and can be saved in a tabular format. MySQL provides the LOAD DATA INFILE statement to import a CSV file. This statement is used to read a text file and import it into a database table very quickly. The full syntax to import a CSV file is given below: LOAD DATA…
CHAR and VARCHAR have differed in storage and retrieval. CHAR column length is fixed, while VARCHAR length is variable. The maximum no. of character CHAR data types can hold is 255 characters, while VARCHAR can hold up to 4000 characters. CHAR is 50% faster than VARCHAR. CHAR uses static memory allocation, while VARCHAR uses dynamic memory allocation.