WHAT IS function and its types in SQL?

What are the different types of SQL function?

Categories of SQL Functions

  • Single row function: Single row functions are those functions which return a single result row for each row of queried table or view. …
  • Aggregate function: …
  • Analytic function: …
  • Model Functions: …
  • User defined function: …
  • Scalar functions:

How many functions are there in SQL?

For doing operations on data sql has many built-in functions, they are categorised in two categories and further sub-categorised in different seven functions under each category.

SQL | Functions (Aggregate and Scalar Functions)

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What is difference between function and procedure?

Function is used to calculate something from a given input. Hence it got its name from Mathematics. While procedure is the set of commands, which are executed in a order.

What is difference between stored procedure and function?

The function must return a value but in Stored Procedure it is optional. Even a procedure can return zero or n values. Functions can have only input parameters for it whereas Procedures can have input or output parameters. Functions can be called from Procedure whereas Procedures cannot be called from a Function.

What is SQL transaction?

A transaction is a sequence of operations performed (using one or more SQL statements) on a database as a single logical unit of work. The effects of all the SQL statements in a transaction can be either all committed (applied to the database) or all rolled back (undone from the database).

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What is scalar query in SQL?

A scalar subquery expression is a subquery that returns exactly one column value from one row. The value of the scalar subquery expression is the value of the select list item of the subquery. … If the subquery returns more than one row, then Oracle returns an error.

What is data integrity in SQL?

Data Integrity is used to maintain Accuracy and consistency of data in the Table. Data Integrity is used to maintain accuracy and consistency of data in a table.