Sep 16, 2008 · The DUAL table is a special one-row table present by default in all Oracle database installations. It is suitable for use in selecting a pseudocolumn such as SYSDATE or …

Feb 7, 2015 · I used the table (values('x')) DUAL(DUMMY) to retrieve the result from a query that has a single column with an ANY result (in bold what writes the framework, in italic what I put …

Jan 9, 2011 · All database users have access to DUAL. The DUAL table has one column called DUMMY and one row containing the value X. And the SQL Reference: DUAL is a table …

Sep 17, 2010 · Is it possible to have a statement like SELECT "Hello world" WHERE 1 = 1 in SQL? The main thing I want to know, is can I SELECT from nothing, ie not have a FROM clause.

Edit: Per Bacon Bit 's answer, it does seem required by the SQL standard. So in reality, because the name DUAL is such a misnomer, if I were to create a table and name it ATOM or ONE, …

Dec 31, 2014 · In this case the select * from dual only exists because a multi-table INSERT statement needs a query as the source. Normally, when you're creating a multi-table INSERT, …

6 Dual table is used to select pseudo columns. it has one row and one column DUMMY which has a value X. I have two questions What actually does a pseudo column mean? How is the dual …

May 7, 2018 · Before 23c: Instead of DUAL, select from a pre-built collection to return multiple rows. This solution has a small syntax, avoids type conversions, and avoids potentially slow …

Nov 12, 2017 · I have a data as following: 1203 1222 3201 4300 Which are numbers of products, so i need to select them as a data in table .. I think the solution will be with using dual table .. I …

Além disso a dual permite que você possa criar um join, ao contrario da maneira que o sql serve trabalh. No oracle é possivel faze-la duplicas as linhas, caso necessário.