Discover the world with our lifehacks

What is inline subquery in SQL?

What is inline subquery in SQL?

An inline query is a type of sub-query present in FROM clause of a SQL as a data source. A query within a query is a subquery. Below is the type of sub-query: If it present in the SELECT list, it is called “sub-select”. If it present in the FROM clause, it is called “inline-query” or “inline-view”.

What is inline view subquery?

At times it is useful to create a subquery that is used within the FROM clause as if it were a table name. This is known as an inline view or inline view subquery. The SQL statement in the inline view defines the source of the data for the FROM clause.

How do you write an inline view in SQL Server?

The syntax for an inline view is,

  1. SELECT “column_name” FROM (Inline View); Example.
  2. CREATE TABLE User_Higher_Than_200. SELECT User_ID, SUM(Score) FROM User_Score.
  3. SELECT a2.ZIP_CODE, COUNT(a1.User_ID) FROM User_Higher_Than_200 a1, User_Address a2.

What is inline view in SQL Server with example?

An inline view is a SELECT statement in the FROM-clause of another SELECT statement to create a temporary table that could be referenced by the SELECT statement. Inline views are utilized for writing complex SQL queries without join and subqueries operations.

What is difference between subquery and inline query?

The first difference is that inline views can contain multiple columns, while subqueries (in the Oracle meaning) should return only one. The reason is simple – an inline view works like a table and tables can contain more than one column. Subqueries, on the other hand, generally work as a single value.

What is inline table in SQL?

The second type of user-defined function, the inline table-valued function, is similar to a view. Both are wrapped for a stored SELECT statement. An inline table-valued user-defined function retains the benefits of a view, and adds parameters.

What is inline view and write their syntax?

An inline view is a SELECT statement in the FROM-clause of another SELECT statement. In-line views are commonly used to simplify complex queries by removing join operations and condensing several separate queries into a single query. This feature was introduced in Oracle 7.2.

Why we use stored procedure instead of inline query?

By using Stored procedures we can seperate all the queries from the Business logic code. Therefore we can create a seperate layer. But while writing inline queries , all the queries have to be written (mixed up ) with the business logic code.

What are the types of subquery?

Types of Subqueries

  • Single Row Sub Query: Sub query which returns single row output.
  • Multiple row sub query: Sub query returning multiple row output.
  • Correlated Sub Query: Correlated subqueries depend on data provided by the outer query.

What is the difference between inline table valued function and multi statement?

Inline table valued function refers to a TVF where the function body just contains one line of select statement. There is not return variable. Multi-statement table valued function refers to a TVF where it has a return table variable.

What is inline table valued function in SQL Server?

The Inline Table-Valued function in SQL Server can be used to achieve the functionalities of parameterized views, and the table returned by the inline table-valued function in SQL Server can also be used in joins with other tables.

What is subquery in SQL with examples?

In SQL, it’s possible to place a SQL query inside another query known as subquery. For example, SELECT * FROM Customers WHERE age = ( SELECT MIN(age) FROM Customers ); In a subquery, the outer query’s result is dependent on the result-set of the inner subquery. That’s why subqueries are also called nested queries.