CREATE TYPE COLOR AS ENUM ('White', 'Pink', 'Yellow');

create table Estate (Address varchar(255), size integer, primary key (Address));
create table neighbouring (Estate_Address varchar(255), Neighbour_Address varchar(255), 
                           foreign key (Estate_Address) REFERENCES Estate(Address),
                           foreign key (Neighbour_Address) REFERENCES Estate(Address),
                           primary key (Estate_Address, Neighbour_Address)
                          );
create table contains (Estate_Address varchar(255), Address_Of_Estate_Part varchar(255), 
                           foreign key (Estate_Address) REFERENCES Estate(Address),
                           foreign key (Address_Of_Estate_Part) REFERENCES Estate(Address),
                           primary key (Estate_Address, Address_Of_Estate_Part)
							);

create table Heating_System (Address varchar(255), HId integer, kW integer,
                            foreign key (Address) REFERENCES Estate(Address),
                            primary key (Address, HId)
                            );
create table Heat_Pump (Address varchar(255), HId integer,
                            foreign key (Address, HId) REFERENCES Heating_System (Address, HId),
                        	primary key (Address, HId)
                            );
create table Gas_Heating (Address varchar(255), HId integer,
                            foreign key (Address, HId) REFERENCES Heating_System(Address, HId),
                          	primary key (Address, HId)
                            );
create table Greenhouse (Address varchar(255), GId integer, Size integer,
                            foreign key (Address) REFERENCES Estate(Address),
                 			primary key (Address, GId)
                            );
create table heats (Heating_System_Address varchar(255), HId integer, 
            Greenhouse_Address varchar(255), GId integer,
            foreign key (Heating_System_Address, HId) REFERENCES Heating_System(Address, HId),
            foreign key (Greenhouse_Address, GId) REFERENCES Greenhouse(Address, GId),
            primary key (Heating_System_Address, HId, Greenhouse_Address, GId)
					);
create table Employee (SVNR integer PRIMARY KEY, name varchar(255), Address varchar(255));          
create table Checkup(Address varchar(255), GId integer, SVNR integer, Date DATE, Observation VARCHAR(255),
                     foreign key (Address, GId) REFERENCES Greenhouse(Address, GId),
                     primary key (Address, GId, SVNR, Date)
				);
create table Plants(Address varchar(255), GId integer, name varchar(255), Count integer,
                     foreign key (Address, GId) REFERENCES Greenhouse(Address, GId),
                     primary key (Address, GId, name)
				);
create table Palmtrees(Address varchar(255), GId integer, name varchar(255), FrostResistant boolean,
                     foreign key (Address, GId, name) REFERENCES Plants(Address, GId, name),
                     primary key (Address, GId, name)
				);
create table Orchids(Address varchar(255), GId integer, name varchar(255), Color COLOR,
                     foreign key (Address, GId, name) REFERENCES Plants(Address, GId, name),
                     primary key (Address, GId, name)
				);
create table Succulents(Address varchar(255), GId integer, name varchar(255),
                     foreign key (Address, GId, name) REFERENCES Plants(Address, GId, name),
                     primary key (Address, GId, name)
				);
create table Dung (Type varchar(10) primary key, Stock integer);
create table dungs(SVNR integer, Type varchar(10), Address varchar(255), GId integer, name varchar(255),
                  foreign key (Address, GId, name) REFERENCES Plants(Address, GId, name),
                  foreign key (SVNR) REFERENCES Employee (SVNR),
                  foreign key (Type) REFERENCES Dung (Type),
                  primary key (SVNR, Type, Address, GId, name)
                  );

PostgreSQL online editor

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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;