CREATE TABLE EMP(
empID INTEGER PRIMARY KEY,
name TEXT,
dept TEXT,
address varchar(30),
salary INTEGER
);

insert into EMP values(23,'Ani','Design','Pune',7500000);
insert into EMP values(54,'Ashish','IT Support','Pune',100000000);
insert into EMP values(86,'Kartik','Analyst','Pune',499900);
insert into EMP values(44,'Rutuja','Software Eng.','Nagar',3333330);
insert into EMP values(73,'Buddhi','Developer','Satara',99999999);

SELECT* FROM EMP WHERE dept= 'Analyst';
SELECT*from EMP;

SELECT* FROM EMP WHERE name = 'Ani';
SELECT* FROM EMP;

update EMP set dept='EnTc' WHERE name='Ashish';
SELECT * FROM EMP;

 

CREATE TABLE DEPARTMENT (
  deptId INTEGER PRIMARY KEY,
  dname TEXT NOT NULL,
  dcompany TEXT NOT NULL,
  daddress varchar(20)
);

 

INSERT INTO DEPARTMENT VALUES (001, 'Sales', 'Capgemini', 'Hinjawadi');
INSERT INTO DEPARTMENT VALUES (002, 'Accounting', 'Cognizant', 'Hinjawadi');
INSERT INTO DEPARTMENT VALUES (003, 'Developer', 'IBM','Hinjawadi');
INSERT INTO DEPARTMENT VALUES (004, 'Testing', 'Infosys', 'Hinjawadi');
INSERT INTO DEPARTMENT VALUES (005, 'EnTc', 'Wipro', 'Hinjawadi');

 
SELECT * from DEPARTMENT;


delete from EMP WHERE dept='Software Eng';
SELECT * from EMP;
SELECT name, dept from EMP;
SELECT dept, name from EMP;

SELECT name as"Emp Name", dept from EMP;
SELECT name "Emp Name", salary,salary*0.1 as "Allowance", salary+(salary*0.1) as "Net Salary" from EMP;
SELECT* from EMP WHERE empID= 54 OR dept='EnTc'or name ='Ashish';

SELECT* from EMP WHERE dept <> 'Accounting';
SELECT* from DEPARTMENT WHERE deptId in (0001, 0004, 0003);
SELECT* from DEPARTMENT WHERE deptId between 0001 and 0004;


SELECT* from DEPARTMENT WHERE dname like 'A%';
SELECT* from DEPARTMENT order by dname;
SELECT* from EMP order by name;

INSERT INTO EMP (empID, name) values (32,'Priyanka');
SELECT* from EMP;
SELECT round(12.9);
SELECT trunc(12.43456,2);
SELECT empID,name, coalesce(dept,'Manager'), coalesce(salary,6000000) from EMP;

SELECT concat('Hello world');
SELECT concat('Hi ','How are you');
SELECT concat('Hi ','How are you') as "Concatenated String";
SELECT upper('Aarya');
SELECT lower('Aarya');

SELECT length('Welcome');
SELECT length(trim('Welcome'));
SELECT length('Welcome'), length(trim('Welcome   '));
SELECT length('Welcome   '),length(trim('Welcome   '));
SELECT length('  Welcome   '),length(ltrim(' Welcome  '));
SELECT length('  Welcome   '),length(rtrim(' Welcome  '));


SELECT substr('Welcome',4);
SELECT substr('Welcome',1,4);
SELECT strpos('Welcome','come');
SELECT strpos('Welcome','me');
SELECT strpos('Welcome','w');
SELECT strpos('Welcome', 'W');


SELECT upper(name) from EMP;
SELECT count(*) from EMP;
SELECT max(salary) from EMP;
SELECT min(salary) from EMP;
SELECT avg(salary) from EMP;
SELECT trunc(salary) from EMP;

SELECT trunc(avg(salary),2) from EMP;
update EMP set dept ='Manager',salary= 5600000 where empID= 32;
SELECT* from EMP;
SELECT dept, sum(salary) from EMP group by dept;
SELECT dept, sum(salary) from EMP group by dept order by dept;


SELECT dept, sum(salary) from EMP group by dept having sum(salary) >499900 order by sum desc;

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;