Sql Cheat Sheet - Blue

The purpose of the SQL Cheat Sheet - Blue is to serve as a quick reference guide for SQL commands and functions. It provides a concise overview of the most commonly used SQL statements and syntax to help users write and understand SQL queries more effectively.

FAQ

Q: What is SQL?
A: SQL stands for Structured Query Language, it is a programming language used for managing and manipulating relational databases.

Q: What are the basic SQL commands?
A: Some basic SQL commands include SELECT, INSERT, UPDATE, DELETE, and CREATE.

Q: What is the purpose of SELECT statement?
A: SELECT statement is used to retrieve data from a database, it allows you to specify the columns and conditions for selecting the data.

Q: What is the purpose of INSERT statement?
A: INSERT statement is used to insert new rows of data into a table.

Q: What is the purpose of UPDATE statement?
A: UPDATE statement is used to modify existing data in a table.

Q: What is the purpose of DELETE statement?
A: DELETE statement is used to delete rows from a table.

Q: What is the purpose of CREATE statement?
A: CREATE statement is used to create a new table, view, or other database object.

Q: What is a primary key?
A: A primary key is a unique identifier for a row in a table. It ensures that each row in a table is uniquely identifiable.

Q: What is a foreign key?
A: A foreign key is a column or a set of columns in a table that references the primary key of another table. It establishes a relationship between two tables.

Q: What is a JOIN clause?
A: JOIN clause is used to combine rows from two or more tables based on a related column between them.