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- Formally, the WITH clause is called subquery factoring - The SQL WITH clause is used when a subquery is executed multiple times - Also useful for recursive queries (SQL-99, but not Oracle SQL) Using the WITH clause to simplify complex SQL. Oracle SQL can run faster when complex subqueries are replaced with global temporary tables. Starting in Oracle9i release 2, there was an incorporation of a subquery factoring utility implemented the SQL-99 WITH clause. INSERT INTO dummy values (a,b) //more values WITH helper_table AS ( SELECT * FROM dummy2 ) WITH helper_table2 AS //from more tables ( SELECT * FROM dummy3 ) SELECT t.value as a, t2.value as b FROM helper_table t join helper_table t2 on t.value = t2.value //some join WHERE t.value = 'X' and t2.value = 'X' //other stuff. USING clause. The USING clause specifies which columns to test for equality when two tables are joined.

You lose all the performance features a database offers, like indexing. And the detailed security features like row/column-level security or masking. Part 12 in a series of articles on understanding and using PL/SQL By Steven Feuerstein . March/April 2013.

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And must be fixed, replaced with a proper database design. What's the point of using Oracle if you treat it as a file system? You lose all the performance features a database offers, like indexing.

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When the tutorial is finished, the drop Introduction to the Oracle LIKE operator. Sometimes, you want to query data based on a specified pattern. For example, you may want to find contacts whose last names start with 'St' or first names end with 'er'. In this case, you use the Oracle LIKE operator. The syntax of the Oracle LIKE operator is as follows: Part 8 in a series of articles on understanding and using PL/SQL By Steven Feuerstein . July/August 2012.

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The USING clause will be transformed to an ON clause that checks for equality between the named columns in the two tables. C) Using Oracle OR operator to combine with AND operator example. You can combine the OR operator with other logical operators such as AND and NOT to form a condition. For example, the following query returns the orders that belong to the customer id 44 and have canceled or pending status. 2017-12-04 Oracle optimizes the query by treating the query name as either an inline view or as a temporary table.

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Specialister på tv-spel och mobiltelefoner. Besök vår butik på Södermalm i Stockholm. Iphone glas, batterier och andra reservdelar The WITH clause, or subquery factoring clause, is part of the SQL-99 standard and was added into the Oracle SQL syntax in Oracle 9.2.