-- A company maintains the data of its employees in two tables: EMPLOYEE and EMPLOYEE_UIN.
--
-- Table: EMPLOYEE
-- Name     Type       Description
-- ID       Integer    The ID of the employee. This is a primary key.
-- NAME     String     The name of the employee having [1, 20] characters
-- AGE      Integer    The age of the employee.
-- SALARY   Integer    The salary of the employee.
-- ADDRESS  String     The address of the employee having [1, 25]
--
-- Table: EMPLOYEE_UIN
-- Name     Type       Description
-- ID       Integer    The ID of the employee. This is a primary key.
-- UIN      Integer    The unique identification number of the employee.

-- Write a query to print the NAME and UIN of employees. 
-- If there is no unique identification number present corresponding to the employee, 
-- then print NULL instead as the UIN. The order of output does not matter.

-- Sample Input:

-- EMPLOYEE table
-- ID  NAME      AGE  ADDRESS  SALARY
-- ==================================
-- 1   Ileana    27   Paris    74635
-- 2   Bob       30   Sydney   72167
-- 3   Julia     29   Paris    75299
-- 4   Samantha  47   Sydney   46681
-- 5   David     27   Texas    11843

-- EMPLOYEE_UIN table
-- ID  UIN
-- ==============
-- 1   57520-0440
-- 2   49638-001
-- 3   63550-194


-- Sample output:

-- Samantha  NULL
-- Ileana    57520-0440
-- Bob       49638-001
-- Julia     63550-194
-- David     NULL

-- Explanation:

-- Ileana has UIN 57520-0440.
-- Bob has UIN 49638-001.
-- Julia has UIN 63550-194.
-- Samantha does not have a UIN in the EMPLOYEE_UIN table, so NULL is printed. 
-- David does not have a UIN in the EMPLOYEE_UIN table, so NULL is printed.

-- Create the EMPLOYEE table
CREATE TABLE EMPLOYEE (
    ID INTEGER PRIMARY KEY,
    NAME VARCHAR(20),
    AGE INTEGER,
    ADDRESS VARCHAR(25),
    SALARY INTEGER
);

-- Create the EMPLOYEE_UIN table
CREATE TABLE EMPLOYEE_UIN (
    ID INTEGER PRIMARY KEY,
    UIN VARCHAR(12) -- Assuming UIN is a string with maximum length 12
);

-- Insert sample data into the EMPLOYEE table
INSERT INTO EMPLOYEE (ID, NAME, AGE, ADDRESS, SALARY) VALUES
    (1, 'Ileana', 27, 'Paris', 74635),
    (2, 'Bob', 30, 'Sydney', 72167),
    (3, 'Julia', 29, 'Paris', 75299),
    (4, 'Samantha', 47, 'Sydney', 46681),
    (5, 'David', 27, 'Texas', 11843);

-- Insert sample data into the EMPLOYEE_UIN table
INSERT INTO EMPLOYEE_UIN (ID, UIN) VALUES
    (1, '57520-0440'),
    (2, '49638-001'),
    (3, '63550-194');
    

SELECT e.NAME, eu.UIN from EMPLOYEE e 
left join EMPLOYEE_UIN eu on e.id = eu.id;
by

SQLite online editor

Write, Run & Share SQLite queries online using OneCompiler's SQLite online editor and compiler for free. It's one of the robust, feature-rich online editor and compiler for SQLite. Getting started with the OneCompiler's SQLite editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'SQLite' and start writing queries to learn and test online without worrying about tedious process of installation.

About SQLite

SQLite is an in-process C library that implements small, fast, serverless, zero-configuration, transactional SQL database engine.

Key Features:

  • Very small and light weight
  • Serverless
  • Free to use
  • Self contained as no other dependencies required.
  • zero config

Syntax help

Useful Commands

1. CREATE

CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

Example

CREATE TABLE EMPLOYEE (
  empId INTEGER PRIMARY KEY,
  name TEXT NOT NULL,
  dept TEXT NOT NULL
);

2. ALTER

ALTER TABLE Table_name ADD column_name datatype;

Example

INSERT INTO EMPLOYEE VALUES (0001, 'Dave', 'Sales');

3. DROP

DROP TABLE table_name;

4. INSERT

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

Note: Column names are optional.

Example

INSERT INTO EMPLOYEE VALUES (0001, 'Ava', 'Sales');

5. SELECT

SELECT column1, column2, ...
FROM table_name
[where condition];

Example

SELECT * FROM EMPLOYEE where dept ='sales';

6. UPDATE

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

Example

UPDATE EMPLOYEE SET dept = 'Sales' WHERE empId='0001';

7. DELETE

DELETE FROM table_name where condition;

Example

DELETE from EMPLOYEE where empId='0001';

8. CREATE INDEX

  CREATE [UNIQUE] INDEX index_name on table_name(column_name);

9. DROP INDEX

DROP INDEX index_name ON table_name;

10. Create a View

CREATE VIEW View_name AS 
Query;

11. How to call view

SELECT * FROM View_name;

12. Altering a View

ALTER View View_name AS 
Query;

13. Deleting a View

DROP VIEW View_name;

14. INNER JOIN

SELECT * FROM TABLE1 INNER JOIN TABLE2 where condition;

15. LEFT JOIN

SELECT * FROM TABLE1 LEFT JOIN TABLE2 ON condition;

16. RIGHT JOIN

SELECT * FROM TABLE1 RIGHT JOIN TABLE2 ON condition;

17. CROSS JOIN

SELECT select_list from TABLE1 CROSS JOIN TABLE2;