A query that is nested inside anotherqueryis called asubquery. It permits you to fetch data based on the outcomes of another query. For instance, in the below-given query, thesubquerywill fetch the list of customers who ordered something within February 2023. SELECT * FROM customers WHERE cus...
Ans:The Query in MySQL can be written precisely usingIFNULL()statement. The IFNULL() statement test its first argument and returns if it’s not NULL, or returns its second argument, otherwise. mysql> SELECT name, IFNULL(id,'Unknown') AS 'id' FROM taxpayer;+---+---+ | name | id ...
This is one of the significant MySQL query interview questions. For this, an ALTER TABLE query is required. Once invoked, simply mention the column and its definition. Something like this: ALTER TABLE cars ADD COLUMN engine VARCHAR(80) AFTER colour; The ALTER TABLE statement is operated to ad...
MySQL is the world’s second most popular and most commonly used open-source relational database management system (RDBMS). It is based on a structured query language that Oracle supports. In addition, MySQL supports many operating systems, the most well-known of which are Windows, Linux, and...
printf("Table tutorials_tbl updated successfully.");}if($mysqli->errno){printf("Could not update table: %s",$mysqli->error);}$sql="SELECT tutorial_id, tutorial_title, tutorial_author, submission_date FROM tutorials_tbl";$result=$mysqli->query($sql);if($result->num_rows>0){while($ro...
AI Based Resume Builder Personal AI Study Assistant Generate Coding Logic HR Interview Questions Computer Glossary Who is WhoMySQL − QueriesTable of content MySQL Create Database MySQL Use Database MySQL Create Query MySQL Insert Query MySQL Update Query MySQL Alter Query MySQL Delete Query MySQL ...
Following is the UPDATE query that will update the salary of the employees based on the bonus percentage in the departments’ tables based on the deptNum key column. Now, let’s verify the salary of each employee post-hike. If you compare it with the previous snapshot, then you can easil...
In MySQL, which is a particular kind of relational database based on structured query language (SQL), data is stored in the form of tables with rows and columns. Every record stored in a MySQL table is indexed, making it easy to access and change the data. MySQL is a high-performance ...
MySQL sample query: Select * from Students; PostgreSQL sample query: Select * from employees; 3) Replication Replication is a mechanism that enables us to replicate data from the database to its replicated databases. This process ensures that all the users have a similar level of information. ...
MariaDB and MySQL both support SQL to query the database and the tables. Hence, the coding standards are SQL-based standards in MariaDB and MySQL. As MariaDB is forked out of MySQL, you would find that MariaDB queries in almost all cases are exactly similar to MySQL queries. ...