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Learn how to use the WITH clause, or subquery factoring clause, in Oracle SQL to reduce repetition and simplify complex queries. See examples of inline views, temporary tables, and materialized views with the WITH clause.
23 wrz 2012 · The SQL WITH clause was introduced by Oracle in the Oracle 9i release 2 database. The SQL WITH clause allows you to give a sub-query block a name (a process also called sub-query refactoring), which can be referenced in several places within the main SQL query.
5 lis 2024 · The SQL WITH clause, or Common Table Expressions, is a powerful feature for managing complex SQL queries. Whether you are using the WITH clause in Oracle or SQL Server WITH clause, it improves performance and makes queries more readable by allowing temporary tables in SQL.
19 lis 2018 · With Clause in Oracle is released in Oracle 9i release 2 to improve the performance of complex sql queries. The clause works like a global temporary tables of oracle which is used to improve the query speed of complex sql queries.
21 mar 2017 · The WITH clause is just like any other SQL construct - another tool in the toolbox to help you write good SQL. It can provide structure and maintenance benefits by building up the SQL in sections. It can be used recursively to handle queries much harder to code in any other way.
Functions in the WITH Clause. The declaration section of the WITH clause can be used to define PL/SQL functions, as shown below. WITH. FUNCTION with_function(p_id IN NUMBER) RETURN NUMBER IS. BEGIN. RETURN p_id; END; SELECT with_function(id) FROM t1. WHERE rownum = 1. / WITH_FUNCTION(ID)
The WITH clause in Oracle PL/SQL is a valuable tool for simplifying and organizing complex SQL queries. It enhances code readability, promotes reusability, and supports recursive queries for handling hierarchical data structures.
