MySQL 関数

DROP TABLE IF EXISTS posts;
CREATE TABLE posts (
  id INT NOT NULL AUTO_INCREMENT,
  message VARCHAR(140),
  likes INT,
  PRIMARY KEY (id)
);

INSERT INTO posts (message, likes) VALUES
  ('Thanks', 12),
  ('Merci', 4),
  ('Arigato', 4),
  ('Gracias', 15),
  ('Danke', 8);

-- + - * / %

SELECT
  likes * 500 / 3 AS bonus,
  FLOOR(likes * 500 / 3) AS floor,
  CEIL(likes * 500 / 3) AS ceil,
  -- ROUND(likes * 500 / 3) AS round
  ROUND(likes * 500 / 3, 2) AS round
FROM
  posts;

投稿者: chosuke

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