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MySQL: NOT NULL constraint
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CREATE TABLE products (
product_id INT,
product_name varchar(25),
price DECIMAL(4, 2) NOT NULL
);
ALTER TABLE products
MODIFY price DECIMAL(4, 2) NOT NULL;
INSERT INTO products
VALUES(104, "cookie", NULL);
CREATE TABLE products (
product_id INT,
product_name varchar(25),
price DECIMAL(4, 2) NOT NULL
);
ALTER TABLE products
MODIFY price DECIMAL(4, 2) NOT NULL;
INSERT INTO products
VALUES(104, "cookie", NULL);
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