ANSI JOIN | NON-ANSI JOIN | EQUI JOIN | SQL JOIN #techpointfundamentals

ANSI JOIN | NON-ANSI JOIN | EQUI JOIN | SQL JOIN

When we retrieve the data from multiple tables based on the “ON” keyword condition then it is called ANSI JOIN. ANSI format JOIN has been introduced in SQL 2005 version.

In ANSI JOIN, the joining condition is specified through the “ON” Clause instead of the “WHERE” clause.

SELECT
U.Name,
Email,
MobileNumber,
R.Name
FROM [User] U
INNER JOIN UserRole UR ON U.Id = UR.UserId
INNER JOIN Role R ON UR.RoleId = R.Id

When we retrieve the information from multiple tables based on the “WHERE” keyword condition then it is called a NON-ANSI JOIN. The Non-ANSI joins are also termed as Standard SQL Syntaxes.

The NON-ANSI joins were used prior to SQL 2005 version. These Joins are executed through SQL OPERATORS.

SELECT
U.Name,
Email,
MobileNumber,
R.Name AS RoleName
FROM [User] U, UserRole UR, Role R
WHERE U.Id = UR.UserId AND UR.RoleId = R.Id

In this video, we will see the ANSI JOIN and NON-ANSI JOIN with a real example.

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