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DATABASE - 3

Advanced SQL

QuestionAnswer
s a precompiled SQL program stored inside the database that performs a specific task. Stored Procedures
The procedure can be executed multiple times without rewriting the SQL commands. Reusable code
Stored procedures are precompiled and stored in the database, so they run faster than repeatedly sending SQL queries. Faster execution
Users can be given permission to execute the procedure without direct access to the underlying tables. Improved security
Instead of sending multiple SQL statements from the application, only the procedure call is sent to the database. Reduced network traffic
is a function created by users inside the database to perform custom calculations or operations. User Defined Functions (UDF)
Types of UDF: • Scalar Function • Table-Valued Function
Returns a single value. Commonly used for calculations. Scalar Function
Returns a table instead of a single value. Can be used like a table in queries. Table-Valued Function
• Returns multiple rows and columns. • Can be used in the FROM clause of a query. • Useful for reusable queries that return structured datasets. • Accepts input parameters to filter results. • Improves modularity and code reusability in SQL. Table-Valued Function
Types of Table-Valued Functions: Inline Table-Valued Function Multi-Statement Table-Valued Function
o Contains a single SELECT statement. o Faster and simpler Inline Table-Valued Function
o Can contain multiple SQL statements. o Uses a table variable to store results. Multi-Statement Table-Valued Function
is a special type of stored procedure that automatically executes when a database event occurs. Triggers
Common Events Triggers • INSERT • UPDATE • DELETE
• Audit logging • Data validation • Maintaining data consistency • Enforcing business rules Triggers
is the process of improving SQL query performance. Query Optimization
Created by: user-1782765
 

 



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