create table Categorias(
IdCategoria int primary key not null,
NombreCategoria varchar(15),
Descripcion varchar (50),
imagen varchar (50));

Create table Clientes (
IdCliente varchar(15) primary key not null,
NombreCompañia varchar(15),
NombreContacto varchar(15),
Cargo varchar(15),
Direccion varchar(15),
Ciudad varchar(15),
Region varchar(15),
CodPostal varchar(15),
Pais varchar(15),
Telefono varchar(15),
Fax varchar(15));

Create table ComEnvios (
IdCompaniaEnvios int primary key not null,
NombreCompañia varchar(15),
Telefono varchar(15));

Create table DetallePedidos (
IdPedido int  not null,
IdProducto int not null,
PrecioUnidad decimal,
Cantidad int,
Descuento numeric,
constraint PkDetallePedido Primary key(IdPedido,IdProducto));

Create table Empleados (
IdEmpleado int primary key not null,
Apellidos varchar(15),
Nombre varchar(15),
Cargo varchar(15),
Tratamiento varchar(15),
FechaNacimiento date,
FechaContratacion date,
Direccion varchar(15),
Ciudad varchar(15),
Region varchar(15),
CodPostal varchar(15),
Pais varchar(15),
TelDomicilio varchar(15),
Extension varchar(15));
 
Create table Pedidos (
IdPedido int  not null,
IdCliente varchar(15),
IdEmpleado int,
FechaPedido date,
FechaEntrega date,
FechaEnvio date,
IdCompaniaEnvios int,
Valor decimal,
Destinatario varchar(15),
DireccionDestinatario varchar(15),
CiudadDestinatario varchar(15),
RegionDestinatario varchar(15),
CodPostalDestinatario varchar(15),
PaisDestinatario varchar(15));


Create table Productos (
IdProducto int primary key not null,
NombreProducto varchar(15),
IdProveedor int ,
IdCategoria int ,
CantidadPorUnidad varchar(15),
PrecioUnidad decimal,
UnidadesEnPedido int,
NivelNuevoPedido numeric,
Suspendido bit);

Create table Proveedores (
IdProveedor int primary key not null,
NombreCompañia varchar(15),
NombreContacto varchar(15),
CargoContacto varchar(15),
Direccion varchar(15),
Ciudad varchar(15),
Region varchar(15),
CodPostal varchar(15),
Pais varchar(15),
Telefono varchar(15),
Fax varchar(15),
PaginaPrincipal varchar(50));

alter table productos
add constraint  FkProveedor foreign key (IdProveedor) references Proveedores (IdProveedor);

alter table productos
add constraint  FkCtegoria foreign key (IdCategoria) references Categorias (IdCategoria);

alter table Pedidos
add constraint  FkEmpleado foreign key (IdEmpleado) references Empleados (IdEmpleado);

alter table Pedidos
add constraint  FkEnvios foreign key (IdCompaniaEnvios) references ComEnvios (IdCompaniaEnvios);

alter table Pedidos
add constraint  FkClientes foreign key (IdCliente) references Clientes (IdCliente);

alter table DetallePedidos
add constraint FkProducto foreign key (IdProducto) references productos (IdProducto);


alter table DetallePedidos
add constraint FkPedido foreign key (IdPedido) references Pedidos (IdPedido);
by

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;