Question

So initially I was thinking something like this.

CREATE TABLE `events` (
    `event_id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
    `event_name` VARCHAR(200),
    `date_added` DATETIME
    PRIMARY KEY(event_id)
);

CREATE TABLE `event_date` (
    `event_id` INTEGER UNSIGNED NOT NULL,
    `start_date` DATE,
    `end_date` DATE,
    FOREIGN KEY event_id REFERENCES events(event_id) ON DELETE CASCADE
);

CREATE TABLE `event_times` (
    `event_id` INTEGER UNSIGNED NOT NULL,
    `event_date` DATE,
    `start_time` TIME,
    `end_time` TIME,
    FOREIGN KEY event_id REFERENCES events(event_id) ON DELETE CASCADE
);

Would it be possible to make sure that the even_times.event_date falls within the event_date.start_date and event_date.end_date range, with this schema?

Answer 1

With this structure I think you cover the needs that explain

CREATE TABLE events(
  event_id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  event_name VARCHAR(200) DEFAULT NULL,
  date_added DATETIME DEFAULT NULL,
  PRIMARY KEY (event_id)
);

CREATE TABLE event_date(
  event_date_id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  event_id INT(10) UNSIGNED NOT NULL,
  start_date DATE DEFAULT NULL,
  end_date DATE DEFAULT NULL,
  PRIMARY KEY (event_date_id),
  INDEX FK_event_date_events_event_id (event_id),
  CONSTRAINT FK_event_date_events_event_id FOREIGN KEY (event_id)
  REFERENCES events (event_id) ON DELETE CASCADE ON UPDATE RESTRICT
);

CREATE TABLE event_times(
  event_time_id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  event_date_id INT(10) UNSIGNED NOT NULL,
  start_time TIME DEFAULT NULL,
  end_time TIME DEFAULT NULL,
  PRIMARY KEY (event_time_id),
  INDEX FK_event_times_event_date_event_date_id (event_date_id),
  CONSTRAINT FK_event_times_event_date_event_date_id FOREIGN KEY (event_date_id)
  REFERENCES event_date (event_date_id) ON DELETE CASCADE ON UPDATE RESTRICT
)

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