CREATE TABLE Persons (

    ID int NOT NULL,

    LastName varchar(255) NOT NULL,

    FirstName varchar(255),

    Age int,

    City varchar(255) DEFAULT 'Sandnes'

);

/*Alter an existing column to add a default constraint*/

ALTER TABLE (Table_Name)

ADD CONSTRAINT (Constraint_Name)

DEFAULT (Default_Value) FOR (Existing_Column_Name)

​

ALTER TABLE table_name

ALTER COLUMN column_name SET DEFAULT default_value;

/*Adding a New Column, with default value to an existing table*/

ALTER TABLE (Table_Name)

ADD (Column_Name)(Data_Type) (Null/NOT NULL)

CONSTRAINT (Constraint_Name) DEFAULT (Default_Value)

Sets a default value for a column;

Example 1 (MySQL): Creates a new table called Products which has a

name column with a default value of ‘Placeholder Name’ and an available_

from column with a default value of today’s date.

CREATE TABLE products (

id int,

name varchar(255) DEFAULT 'Placeholder Name',

available_from date DEFAULT GETDATE()

);

Example 2 (MySQL): The same as above, but editing an existing table.

ALTER TABLE products

ALTER name SET DEFAULT 'Placeholder Name',

ALTER available_from SET DEFAULT GETDATE();

Are SQL attributes that have their default values even if the values are not provided

const box = document.querySelector('.box');

​

      let animationComplete = true;

​

      box.addEventListener('mouseenter', () => {

        if (animationComplete) {

          animationComplete = false;

​

          // Move the box to the right

          gsap.to(box, {

            x: 500, // Move box 500px to the right

            duration: 2, // Duration of 2 seconds

            onComplete: () => {

              // Instantly return to the original position

              gsap.to(box, {

                x: 0, // Move box back to the original position

                duration: 0, // No delay for the return (instant move)

                onComplete: () => {

                  animationComplete = true; // Allow next hover to trigger the animation

                },

              });

            },

          });

        }

      });

# For the most recent version of SQL:

​

ALTER TABLE table_name MODIFY column_name DATATYPE;

​

# Example:

ALTER TABLE payments MODIFY COLUMN currency VARCHAR(10);