oracle11g - What is an oracle dummy table? - Stack Overflow
Apr 16, 2013 · The DUAL table is a special one-row, one-column table present by default in Oracle and other database installations. In Oracle, the table has a single VARCHAR2 (1) column called DUMMY …
What is the equivalent of the Oracle "Dual" table in MS SqlServer?
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 as …
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 USER The table …
sql - SELECT from nothing? - Stack Overflow
Sep 17, 2010 · On Postgresql, it's possible to create a dummy table called DUAL and perform queries from a phantom-like table.
Quickest way to fill SQL Table with Dummy Data [closed]
What is the quickest way to fill a SQL table with dummy data? I have a wide table with about 40 fields of different kinds (int, bit, varchar, etc.) and need to do some performance testing. I'm usin...
sql - Select without a FROM clause in Oracle - Stack Overflow
Dec 10, 2009 · Using the dual table is a good practice. dual is an in-memory table. If you don't select DUMMY from it, it uses a special access path (FAST DUAL) which requires no I/O. Once upon a …
Kusto create an in-memory table for testing - Stack Overflow
Dec 2, 2020 · Just looking to create a quick in-memory/temp table for testing out queries. I've seen this done before but I'm having trouble finding any examples from a web search or StackOverflow …
Best way to create a temp table with same columns and type as a ...
Feb 9, 2012 · I need to create a temp table with same columns and type as a permanent table. What is the best way to do it? (The Permanent table has over 100 columns) i.e. Usually I create table like …
Oracle: SELECT value from where clause as dummy table
Jul 18, 2018 · after a lot of searching I unfortunately couldn't find a solution for the following task: I need an Oracle-SQL-Query that returns the value from the WHERE-clause as the result value. This …
sql - Inserting Data into Hive Table - Stack Overflow
Jun 15, 2012 · I am new to hive. I have successfully setup a single node hadoop cluster for development purpose and on top of it, I have installed hive and pig. I created a dummy table in hive: create table …