-- create tabla lectores
CREATE TABLE Lectores (
  lectorID INTEGER PRIMARY KEY,
  nombre TEXT NOT NULL,
  apellido TEXT NOT NULL,
  email TEXT NOT NULL,
  nacimiento TEXT
);

-- create tabla Libros
CREATE TABLE Libros ( 
  libroID INTEGER PRIMARY KEY,
  nombreLibro TEXT NOT NULL,
  nombreEditorial TEXT NOT NULL,
  autor TEXT NOT NULL,
  ISBN INTEGER NOT NULL
);

-- insert lectores
INSERT INTO Lectores VALUES (0001, 'Juan Alberto', 'Cortez', '[email protected]', '20/06/1983');
INSERT INTO Lectores VALUES (0002, 'Antonia', 'de los Ríos', '[email protected]', '24/11/1978');
INSERT INTO Lectores VALUES (0003, 'Nicolas', 'Martin', '[email protected]', '11/07/1986');
INSERT INTO Lectores VALUES (0004, 'Nestor', 'Casco', '[email protected]', '11/02/1981');
INSERT INTO Lectores VALUES (0005, 'Lisa', 'Pérez', '[email protected]', '11/08/1994');
INSERT INTO Lectores VALUES (0006, 'Ana Rosa', 'Estagnolli', '[email protected]', '15/10/1974');
INSERT INTO Lectores VALUES (0007, 'Milagros', 'Pastoruti', '[email protected]', '22/01/2001');
INSERT INTO Lectores VALUES (0008, 'Pedro', 'Alonso', '[email protected]', '05/09/1983');
INSERT INTO Lectores VALUES (0009, 'Arturo Ezequiel', 'Ramírez', '[email protected]', '29/03/1998');
INSERT INTO Lectores VALUES (0010, 'Juan Ignacio', 'Altarez', '[email protected]', '24/08/1975');

-- insert libros
INSERT INTO Libros VALUES (0001, 'Cementerio de animales', 'Ediciones de Mente', 'Stephen King', 4568874);
INSERT INTO Libros VALUES (0002, 'En el nombre de la rosa', 'Editorial España', 'Umberto Uco', 44558877);
INSERT INTO Libros VALUES (0003, 'Cien años de soledad', 'Sudamericana', 'Gabriel Garcia Márquez', 7788845);
INSERT INTO Libros VALUES (0004, 'El diario de Ellen Rimbauer', 'Editorial Maine', 'Stephen King', 45699874);
INSERT INTO Libros VALUES (0005, 'La hojarasca', 'Sudamericana', 'Gabriel Garcia Marquez', 7787898);
INSERT INTO Libros VALUES (0006, 'El amor en los tiempos de cólera', 'Sudamericana', 'Gabriel Garcia Marquez', 2564111);
INSERT INTO Libros VALUES (0007, 'La casa de los espíritus', 'Ediciones Chile', 'Isabel Allende', 5544781);
INSERT INTO Libros VALUES (0008, 'Paula', 'Ediciones Chile', 'Isabel Allende', 22545447);
INSERT INTO Libros VALUES (0009, 'La tregua', 'Alfa', 'Mario Benedetti', 2225412);
INSERT INTO Libros VALUES (0010, 'Gracias por el fuego', 'Alfa', 'Mario Benedetti', 88541254);

-- fetch 
SELECT * FROM Lectores WHERE apellido = 'Casco';

SELECT * FROM Libros WHERE  nombreEditorial= 'Alfa';
by

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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;