"Welcome to my channel! In this video, I share the top EPSILON Company ETL Testing interview questions and provide expert answers to help you prepare for your next job interview. Whether you're a fresher or an experienced professional, these questions will give you insights into what EPSILON looks for in ETL testing candidates.
#ETLTesting #EPSILONInterview #ETLTestingQuestions #DataWarehousing #JobInterviewPrep #ETLTestingTips #CareerAdvice #InterviewPreparation #DataQuality #ETLTestingExpert #testing

CREATE TABLE example_table (
id NUMBER,
value VARCHAR2(10)
);

INSERT INTO example_table (id, value) VALUES (101, '999');
INSERT INTO example_table (id, value) VALUES (109, '999');
INSERT INTO example_table (id, value) VALUES (103, '888');
INSERT INTO example_table (id, value) VALUES (101, NULL);
INSERT INTO example_table (id, value) VALUES (109, '_');
INSERT INTO example_table (id, value) VALUES (109, '000');


CREATE TABLE user_transactions (
user_id VARCHAR2(10),
transaction_date DATE
);
INSERT INTO user_transactions (user_id, transaction_date) VALUES ('V1', TO_DATE('15JUL2024', 'DDMONYYYY'));
INSERT INTO user_transactions (user_id, transaction_date) VALUES ('V1', TO_DATE('16JUL2024', 'DDMONYYYY'));
INSERT INTO user_transactions (user_id, transaction_date) VALUES ('V1', TO_DATE('15JUL2024', 'DDMONYYYY'));
INSERT INTO user_transactions (user_id, transaction_date) VALUES ('V2', TO_DATE('15JUL2024', 'DDMONYYYY'));
INSERT INTO user_transactions (user_id, transaction_date) VALUES ('V3', TO_DATE('15JUL2024', 'DDMONYYYY'));
INSERT INTO user_transactions (user_id, transaction_date) VALUES ('V3', TO_DATE('16JUL2024', 'DDMONYYYY'));

Create Tables
CREATE TABLE employees_first_name (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50)
);

CREATE TABLE employees_last_name (
employee_id NUMBER PRIMARY KEY,
last_name VARCHAR2(50)
);

Insert Data into employees_first_name
INSERT INTO employees_first_name (employee_id, first_name) VALUES (1, 'John');
INSERT INTO employees_first_name (employee_id, first_name) VALUES (2, NULL);
INSERT INTO employees_first_name (employee_id, first_name) VALUES (3, 'Alice');
INSERT INTO employees_first_name (employee_id, first_name) VALUES (4, 'Bob');
INSERT INTO employees_first_name (employee_id, first_name) VALUES (5, NULL);

Insert Data into employees_last_name
INSERT INTO employees_last_name (employee_id, last_name) VALUES (1, 'Smith');
INSERT INTO employees_last_name (employee_id, last_name) VALUES (2, 'Doe');
INSERT INTO employees_last_name (employee_id, last_name) VALUES (3, 'Johnson');
INSERT INTO employees_last_name (employee_id, last_name) VALUES (4, 'Brown');
INSERT INTO employees_last_name (employee_id, last_name) VALUES (5, 'Williams');