Sure, you can use the GROUP_CONCAT() function to return all items in a single row in MySQL. The syntax is as follows:

SQL

SELECT GROUP_CONCAT(column_name) AS column_name
FROM table_name;

For example, if you have a table called products with the columns name and price, you could use the following query to return all product names in a single row:

SQL

SELECT GROUP_CONCAT(name) AS names
FROM products;

This would return a single row with a comma-separated list of all product names.

Here is an example of how to use the GROUP_CONCAT() function in MySQL:

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);

SELECT GROUP_CONCAT(name) AS names
FROM products;

This will return the following result:

names
Product 1,Product 2,Product 3

As you can see, the GROUP_CONCAT() function has returned all product names in a single row, separated by commas.