What is the dual table in Oracle? - Stack Overflow
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 …
sql - What is the equivalent of the Oracle "Dual" table in MS …
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 …
How does the Oracle DUAL table work?
Jan 11, 2011 · The dual table is useful when a value must be returned only once, for example, the current date and time. All database users have access to DUAL. The DUAL table has one …
oracle - Why do I have to select from the dual table? - Database ...
The advantage to dual is the optimizer understands dual is a special one row, one column table (with varchar2 data type) -- when you use it in queries, it uses this knowledge when …
pseudo columns & DUAL table - what do they actually mean?
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 …
sql - O que é e qual a utilidade da tabela DUAL para o Oracle?
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.
About dual table structure in Oracle SQL *Plus - Stack Overflow
Jan 22, 2013 · "From the documentation (CONCEPTS): The dual table is useful when a value must be returned only once, for example, the current date and time. All database users have …
sql - Is it possible to include dual table in a join query - Stack …
Oct 15, 2012 · Is it possible to include the DUAL table in a join query ? Can anyone give me an example which includes the SYSTIMESTAMP from dual table.
sql - Select data from dual table - Stack Overflow
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 …
sql - SELECT from nothing? - Stack Overflow
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.