To set all values in a single column in MySQL, you can use the UPDATE statement with the SET clause. The syntax is as follows:

SQL

UPDATE table_name
SET column_name = value
WHERE condition;

For example, the following SQL statement will set all values in the price column of the products table to 100:

SQL

UPDATE products
SET price = 100;

This will update all rows in the products table where the price column is not NULL.

Here is an example of how to set all values in a single column in a MySQL query:

SQL

CREATE TABLE products (
  id INT NOT NULL AUTO_INCREMENT,
  name VARCHAR(255) NOT NULL,
  price INT NOT NULL,
  PRIMARY KEY (id)
);

INSERT INTO products (name, price) VALUES
('Product 1', 100),
('Product 2', 200),
('Product 3', 300);

UPDATE products
SET price = 100;

This will update all rows in the products table where the price column is not NULL. The price column will be set to 100 for all rows.

Here are some additional things to keep in mind when using the UPDATE statement:

• The WHERE clause is optional. If you do not specify a WHERE clause, all rows in the table will be updated.
• You can use the SET clause to update multiple columns at once.
• You can use the UPDATE statement to update a subset of rows in a table by using the WHERE clause.