Knowledge in sql interview questions and answers

SQL JOIN

SQL JOIN A JOIN clause is used to combine rows from two or more tables, based on a related column between them. Let's look at a selection from the "Orders" table: Then, look at a selection from the "Customers" table: Notice that the "CustomerID" column in the "Orders" table refers to the "CustomerID" in the "Customers" table. The relationship between the two tables above is the "CustomerID" column

SQL Tutorial

SQL TutorialSQL is a standard language for storing, manipulating and retrieving data in databases.Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.Examples in Each ChapterWith our online SQL editor, you can edit the SQL statements, and click on a button to view the result.ExampleSELECT * FROM Customers;