-- Versione 2 (senza ciclo)

-- create database zoo;
create schema zoo_schema;
set search_path to zoo_schema,public;

drop table if exists area;
create table area (
    nome varchar(25) not null,
    
    primary key (nome)
);

drop table if exists addetto;
create table addetto (
    cf char(16) not null,
    
    primary key (cf)
);

drop table if exists casa;
create table casa (
    area varchar(25) not null,
    numero integer not null,
    genere varchar(25) not null,
    numero_esemplari integer not null,
    
    primary key (area, numero),
    foreign key (area) references area(nome)
        on update cascade  on delete no action
);

drop table if exists esemplare;
create table esemplare (
    genere varchar(25) not null,
    codice integer not null,
    data_arrivo date not null,
    nome varchar(25) not null,
    sesso char(1) not null,
    data_nascita date not null,
    paese_di_provenienza varchar(25) not null,

    primary key (genere, codice),
    check (sesso in ('M', 'F'))
);

drop table if exists gabbia;
create table gabbia (
    area varchar(25) not null,
    casa integer not null,
    lettera char(1) not null,
    genere_esemplare varchar(25) not null,
    codice_esemplare integer not null,
    
    primary key (area, casa, lettera),
    foreign key (area, casa) references casa(area, numero)
        on update cascade  on delete no action,
    foreign key (genere_esemplare, codice_esemplare) references esemplare(genere, codice)
        on update cascade  on delete no action,
    unique (genere_esemplare, codice_esemplare)
);

drop table if exists controllo;
create table controllo (
    genere_esemplare varchar(25) not null,
    codice_esemplare integer not null,
    data date not null,
    peso numeric(5, 2) not null,
    dieta text not null,
    cf_veterinario char(16) not null,

    primary key (genere_esemplare, codice_esemplare, data),
    foreign key (genere_esemplare, codice_esemplare) references esemplare(genere, codice)
        on update cascade  on delete no action
);

drop table if exists malattia;
create table malattia (
    nome varchar(25) not null,

    primary key (nome)
);

drop table if exists malattie_controlli;
create table malattie_controlli (
    malattia varchar(25) not null,
    genere_esemplare varchar(25) not null,
    codice_esemplare integer not null,
    data date not null,

    primary key (malattia, genere_esemplare, codice_esemplare),
    foreign key (malattia) references malattia(nome)
        on update cascade  on delete no action,
    foreign key (genere_esemplare, codice_esemplare, data) references controllo(genere_esemplare, codice_esemplare, data)
        on update cascade  on delete no action
);

drop table if exists pulizia;
create table pulizia (
    addetto char(16) not null,
    giorno_settimana char(3) not null,
    area varchar(25) not null,
    numero integer not null,

    primary key (addetto, giorno_settimana, area),
    foreign key (addetto) references addetto(cf)
        on update cascade  on delete no action,
    foreign key (area, numero) references casa(area, numero)
        on update cascade  on delete no action,
    check (giorno_settimana in
        ('lun', 'mar', 'mer', 'gio', 'ven', 'sab', 'dom'))
);

PostgreSQL online editor

Write, Run & Share PostgreSQL queries online using OneCompiler's PostgreSQL online editor and compiler for free. It's one of the robust, feature-rich online editor and compiler for PostgreSQL. Getting started with the OneCompiler's PostgreSQL editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose database as 'PostgreSQL' and start writing queries to learn and test online without worrying about tedious process of installation.

About PostgreSQL

PostgreSQL is a open source relational database system and is also knows as Postgres.

Key Features:

  • Postgres is not only free and open-source but also it is highly extensible.
  • Custom Data types and funtions from various programming languaues can be introduced and the good part is compiling entire database is not required.
  • ACID(Atomicity, Consistency, Isolation, Durability) compliant.
  • First DBMS which implemented Multi-version concurrency control (MVCC) feature.
  • It's the default database server for MacOS.
  • It supports all major operating systems like Linux, Windows, OpenBSD,FreeBSD etc.

Syntax help

1. CREATE

CREATE command is used to create a table, schema or an index.

Syntax:

         CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

2. ALTER

ALTER command is used to add, modify or delete columns or constraints from the database table.

Syntax

ALTER TABLE Table_name ADD column_name datatype;

3. TRUNCATE:

TRUNCATE command is used to delete the data present in the table but this will not delete the table.

Syntax

TRUNCATE table table_name;

4. DROP

DROP command is used to delete the table along with its data.

Syntax

DROP TABLE table_name;

5. RENAME

RENAME command is used to rename the table name.

Syntax

ALTER TABLE table_name1 RENAME to new_table_name1;

6. INSERT

INSERT Statement is used to insert new records into the database table.

Syntax

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

7. SELECT

Select statement is used to select data from database tables.

Syntax:

SELECT column1, column2, ...
FROM table_name;

8. UPDATE

UPDATE statement is used to modify the existing values of records present in the database table.

Syntax

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

9. DELETE

DELETE statement is used to delete the existing records present in the database table.

Syntax

DELETE FROM table_name where condition;