SQL JOIN Join is used to combine rows from two or more tables, based on a related column between them. ex) Orders table ex) Customers table Custome
A description of how data is organized in a database and the relationships between different entities.An Entity is a unique unit of information. It ca
SELECT \* FROM Customers;SELECT City FROM Customers;SELECT DISTINCT Country FROM Customers;중복 제거 키워드 (DISTINCT)SELECT \* FROM Customers WHERE City = "