create table if not exists company (id int primary key, name varchar not null, age int not null, address varchar, salary int not null);

insert into company values (1, 'Paul', 32, 'California', 20000), (2, 'Allen', 25, 'Texas', 15000), (3, 'Teddy', 23, 'Norway', 20000), (4, 'Mark', 25, 'Rich-Mond', 65000), (5, 'David', 27, 'Texas', 85000), (6, 'Kim', 22, 'South-Hall', 45000), (7, 'James', 24, 'Houstan', 10000);
create table company_test as table company;

select * from company_test;
create table company_log (message varchar);create or replace function test() returns trigger as $mytable$
begin
  if new.age < 21 then
    insert into company_log values ('trying to insert < 21 years data');
  else
    insert into company_log values ('record added');
  end if;
  return new;
 end;
 $mytable$ language 'plpgsql';create trigger mytrigger before insert on company_test for each row execute function test();insert into company_test values (100, 'aaa', 18, 'ap', 20000);
 insert into company_test values (101, 'bbb', 35, 'tn', 30000);
 select * from company_log;
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;