MySQL Interview Questions and Answers

Here’s a code script to convert string data to UTF 8 in your database:

header('Content-Type: text/plain; charset=utf-8');
$databasesToConvert = [ 'database1' */ ];
$typesToConvert = [ 'char', 'varchar', 'tinytext', 'mediumtext', 'text', 'longtext'];
CONVERT(CAST(CONVERT(`{$column}` USING english) AS binary) USING utf8)";
$query = "UPDATE `{$table}` SET " . join( ', ', $converts );
echo "\n", $query, "\n";
echo "\n";
 

Timestamp in MySQL

Timestamp in MySQL is used when users want to convert the value from the current time zone to UTC zone for the sake of storage or UTC time zone to the current time zone for retrieval.

DateTime in MySQL

DateTime in MySQL is used to insert values ‘yyyy-mm-dd’ in the table where yyyy is the year, mm is the month and dd is the date. This keyword is used to retrieve or to display DATETIME values in Mysql.

The view is basically a virtual table which is used to view certain and preferable rows or columns of the table. In practice, users can add a number of SQL functions, JOIN and WHERE clause to view the present data of the table.

In MySQL, the CREATE VIEW statement is used to create a new view inside the database.

Here’s the basic syntax of the statement:

CREATE VIEW productList AS SELECT qty, price, totalprice AS value FROM product;