Example: sql interview queries and answers
CREATE DATABASE ORG;
SHOW DATABASES;
USE ORG;
CREATE TABLE Worker (
WORKER_ID INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
FIRST_NAME CHAR(25),
LAST_NAME CHAR(25),
SALARY INT(15),
JOINING_DATE DATETIME,
DEPARTMENT CHAR(25)
);
INSERT INTO Worker
(WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT) VALUES
(001, 'Monika', 'Arora', 100000, '14-02-20 09.00.00', 'HR'),
(002, 'Niharika', 'Verma', 80000, '14-06-11 09.00.00', 'Admin'),
(003, 'Vishal', 'Singhal', 300000, '14-02-20 09.00.00', 'HR'),
(004, 'Amitabh', 'Singh', 500000, '14-02-20 09.00.00', 'Admin'),
(005, 'Vivek', 'Bhati', 500000, '14-06-11 09.00.00', 'Admin'),
(006, 'Vipul', 'Diwan', 200000, '14-06-11 09.00.00', 'Account'),
(007, 'Satish', 'Kumar', 75000, '14-01-20 09.00.00', 'Account'),
(008, 'Geetika', 'Chauhan', 90000, '14-04-11 09.00.00', 'Admin');
CREATE TABLE Bonus (
WORKER_REF_ID INT,
BONUS_AMOUNT INT(10),
BONUS_DATE DATETIME,
FOREIGN KEY (WORKER_REF_ID)
REFERENCES Worker(WORKER_ID)
ON DELETE CASCADE
);
INSERT INTO Bonus
(WORKER_REF_ID, BONUS_AMOUNT, BONUS_DATE) VALUES
(001, 5000, '16-02-20'),
(002, 3000, '16-06-11'),
(003, 4000, '16-02-20'),
(001, 4500, '16-02-20'),
(002, 3500, '16-06-11');