To delete rows in a table in JavaScript, use the DOM deleteRow() method.ExampleYou can try to run the following code to learn how to delete rows in a table. The code deletes rows one at a time −Live Demo                 function ... Read More

For adding MySQL stored GENERATED COLUMNS in a table, we can use the same syntax as adding a column just adding “AS(expression)” after the data type. Its syntax would be as follows −SyntaxALTER TABLE table_name ADD COLUMN column_name AS(expression)STORED;Examplemysql> ALTER TABLE employee_data_stored ADD COLUMN FULLName Varchar(200) AS (CONCAT_WS(" ", 'First_name', ... Read More

To illustrate the making of MySQL view with subquery we are using the following data from the table ‘Cars’ −mysql> select * from cars; +------+--------------+---------+ | ID   | Name         | Price   | +------+--------------+---------+ |    1 | Nexa         | 750000 ... Read More

Followings are the status variables in MYSQL which provide us the counts of event-related operations −Com_create_event It provides us the number of CREATE EVENT statements executed since the last server restart.Com_alter_event − It provides us the number of ALTER EVENT statements executed since the last server restart.Com_drop_event − It provides ... Read More

It can be done with the help of the INFORMATION_SCHEMA database. Following statement will give us the metadata of triggers −mysql> Select trigger_schema, trigger_name, action_statement     -> from information_schema.triggers\G *************************** 1. row ***************************   trigger_schema: query     trigger_name: trigger_before_delete_sample action_statement: BEGIN SET @count = if (@count IS NULL, ... Read More

We can also use the BEGIN statement to start a new transaction. It is the same as the START TRANSACTION statement.Examplemysql> BEGIN; Query OK, 0 rows affected (0.00 sec) mysql> INSERT INTO Marks Values(1, 'Aarav', 'History', 40); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO Marks ... Read More

As we know that WHERE clause is used to put condition/s in MySQL query and MySQL returns result set based on those conditions. Similarly when we use REPLACE() function with WHERE clause, the result set will depend upon the conditions provided. Following is an example by using data from the ... Read More

MySQL NULL-safe equal operator, equivalent to standard SQL IS NOT DISTINCT FROM operator, performs an equality comparison like = operator. Its symbol is . It performs differently from the comparison operators in the case when we have NULL as both the operands. Consider the following examples to understand NULL-safe operator ... Read More

Bit-field notation is the notation with the help of which we can write bit-field values. The syntax of Bit-field notation is as follows −Syntaxb’value’   OR 0bvalueHere, the value is a binary value written by using zeros and ones.The mainly Bit-filed notation is convenient for specifying values to be assigned ... Read More

As we know that there is no BOOLEAN data type in MySQL hence by using TRUE or true, FALSE or false we can enter Boolean values in MySQL statement.Examplemysql> Select TRUE, FALSE; +------+-------+ | TRUE | FALSE | +------+-------+ |    1 |     0 | +------+-------+ 1 row ... Read More