GitHub6 个月
SQL & DB Interview Questions & Answers for Data Scientists.md
Q1: What are joins in SQL and discuss its types? A JOIN clause is used to combine rows from two or more tables, based on a related column between them. It is used to merge two tables or retrieve data ...
GitHub2 年
62.1 Amazon Complex SQL Interview Questions Group BY JOINS OR MULTIPLE QUERIES.sql
#create table Contests ( contest_id INT, hacker_id INT, name VARCHAR(200) ); #insert into Contests (contest_id, hacker_id, name) values (66406, 17973, 'Rose'), (66556 ...