Good Morning,
I am a beginner in database and I'm developing a Database (with Tcl/Tk)
to control the loans of books in a reading room.
Some users will have administrator privileges (to make loans, register
other users etc).
I am creating a table to store login and password to be used in the
authentication of the admin users (admin_user).
Id_user is the primary key of the user table (all users).
I want to avoid two administrators (admin_user) with the same login but
for this I am in doubt if I put the two fields as primary key or as unique:
CREATE TABLE admin_user (
id_user integer,
login text NOT NULL,
password text NOT NULL,
admin_registration_date INTEGER NOT NULL,
id_super_admin INTEGER NOT NULL,
*PRIMARY KEY (id_user, login),*
*FOREIGN KEY(id_**user**) REFERENCES us**er**(id_us**er**)*);
or
CREATE TABLE admin_user (
id_user integer,
login text NOT NULL,
password text NOT NULL,
admin_registration_date INTEGER NOT NULL,
id_super_admin INTEGER NOT NULL,
*UNIQUE (id_user, login),*
*FOREIGN KEY(id_**user**) REFERENCES us**er**(id_us**er**)*);
What are the possible consequences of the two strategies and which would
be the most appropriate?
Thank you,
Markos
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