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The USING clause specifies which columns to test for equality when two tables are joined. It can be used instead of an ON clause in the JOIN operations that have an explicit join clause.
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- SQL Clauses
27 mar 2006 · This article is intended for all Developers using Oracle Forms 6.0. Using From Clause Query dynamically with Forms variables. In Forms Builder build a block manually.
23 kwi 2013 · To a large extent which you use is a matter of style, but there are (at least) two situations where you can't use using: (a) when the column names are not the same in the two tables, and (b) when you want to use the joining column: select e.ename, d.dname, d.deptno. from emp e join dept d using(deptno);
21 mar 2018 · USING Clause is used to match only one column when more than one column matches. NATURAL JOIN and USING Clause are mutually exclusive. It should not have a qualifier (table name or Alias) in the referenced columns. NATURAL JOIN uses all the columns with matching names and datatypes to join the tables.
19 sie 2022 · How to create a join with the USING clause in Oracle? Use the USING clause to specify the columns for the equijoin where several columns have the same names but not same data types. Use the USING clause to match only one column when more than one column matches.
Joins. A join is a query that combines rows from two or more tables, views, or materialized views. Oracle Database performs a join whenever multiple tables appear in the FROM clause of the query. The select list of the query can select any columns from any of these tables.
Purpose. Use a SELECT statement or subquery to retrieve data from one or more tables, object tables, views, object views, materialized views, analytic views, or hierarchies.
