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Re: Parent child relationship questions
Posted by: Peter Brawley
Date: July 24, 2022 03:49PM

Basically, designing a database properly requires at least a semester of relational database knowledge. Before attempting a db design, you need to assimilate relational & design basics eg starting with docs like ...

... then working through some existing designs like the sakila and world databases available for MySQL.

If device_details is the parent and device_events is the child then, based on the slim info we have, you need something like ...

create table device_types (
  device_type_id smallint unsigned primary key,
  device_desc varchar(64)

create table device_event_types (
  device_event_type_id smallint unsigned primary key,
  device_event_type_desc varchar(64)

create table device_details (
  device_id int unsigned primary key,
  device_type smallint unsigned,
  foreign key(device_type) references device_types(device_type_id)
create table device_events (
  device_event_id int unsigned primary key,
  device_id int unsigned,
  foreign key(device_id) references device_details(device_id),
  device_event_type_id smallint unsigned,
  foreign key(device_event_type_id) references device_event_types(device_event_type_id)

... but you really need to walk through the entire specification as described in the 2nd link above.

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Re: Parent child relationship questions
July 24, 2022 03:49PM

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