What is Sql joins, cte, Sp vs function, user defined types,

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SQL joins are used to combine rows from two or more tables based on a related column between them.

SQL joins are used to retrieve data from multiple tables based on a related column.
Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
CTE (Common Table Expression) is a temporary result set that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.
Stored Procedures (SP) are precompiled SQL statements that are stored in the database and can be executed with parameters.
Functions in SQL are reusable code blocks that can accept parameters and return a value.
User Defined Types allow users to define their own data types in SQL Server.

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