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23 maj 2017 · Here are some use cases for a subquery in the from clause. How it works has been explained in the comments to your question (SQL is mathematical closed thanks to its relational operators). 1. Pivot (SQL Server 2008)
B) Oracle subquery in the FROM clause example A subquery in the FROM clause of a SELECT statement is called an inline view which has the following syntax: SELECT * FROM (subquery) [ AS ] inline_view; Code language: SQL (Structured Query Language) ( sql )
23 paź 2017 · According to Using Subqueries Oracle SQL accepts a subquery in the from-clause of a select statement, like. However, looking at the SELECT documentation, I see no possibility to get to select/subquery in the from clause (e.g. from the rules table_reference or join_clause).
In Oracle, a subquery is a query within a query. You can create subqueries within your SQL statements. These subqueries can reside in the WHERE clause, the FROM clause, or the SELECT clause.
You do this by placing the subquery in the FROM clause of the containing query as you would a table name. You may use subqueries in place of tables in this way as well in INSERT , UPDATE , and DELETE statements.
A subquery in the WHERE clause of a SELECT statement is also called a nested subquery. A subquery can contain another subquery. Oracle Database imposes no limit on the number of subquery levels in the FROM clause of the top-level query.
An inline view replaces a table in the from clause of your query. In this query, "select * from bricks" is an inline view: select * from bricks. You use inline views to calculate an intermediate result set. For example, you can count the number of bricks you have of each colour using: select colour, count(*) c.
