This page contains the list commonly asked MySQL interview questions and answers. MySQL is an open-source relational database management system (RDBMS) owned by Oracle, though initially owned and sponsored by a single for-profit firm, the Swedish company MYSQLAB. The complete source code of MySQL is accessible under the GNU General Public License terms.
Q1: In which language MySQL is developed?
MySQL is developed in C & C++ and its SQL parser is written in yacc programming language.
t.order_id, orders.customer_id, t.total, orders.order_placed_date
# List of all orders and total order values (alias t)
order_id, SUM(purchase_price * quantity) AS total
GROUP BY order_id
) AS t
orders ON t.order_id = orders.order_id;
SHOW INDEX FROM <tablename>;
2.3) full join
3) Cross join
SELECT DISTINCT column_name FROM table_name ;
SELECT CONCAT(column1,column2) FROM table_name
Q14: How do you get a portion of a string?
Use the below MySQL query to get a portion of a string:
SELECT SUBSTR(name, 1, 10) from questions;
SELECT (question USING utf8);