Solved

COMBINE TWO QUERIES

Posted on 2008-10-16
2
213 Views
Last Modified: 2012-05-05
Does anyone know why I can run this queries?

SELECT "Student ID", "Student Name" FROM "STUDENT DATA"
WHERE "Crs No" = 10 UNION ALL SELECT * FROM RVM9525.course WHERE  
courseNo = 10

It's giving error massage: query block has incorrect number of result columns
0
Comment
Question by:Dhehien
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 74

Accepted Solution

by:
sdstuber earned 250 total points
ID: 22733774
RVM9525.course must have more than 2 columns

you are querying 2 columns from the first table
but you are unioning it to an unknown number of columns in the second table.
0
 
LVL 143

Assisted Solution

by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 250 total points
ID: 22733778
SELECT *

is returning more that 2 columns!
either change the * into 2 columns, or add some dummy (null) values in the first part

note: SELECT * should really not be used in UNION queries...
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

'Between' is such a common word we rarely think about it but in SQL it has a very specific definition we should be aware of. While most database vendors will have their own unique phrases to describe it (see references at end) the concept in common …
Occasionally there is a need to clean table columns, especially if you have inherited legacy data. There are obviously many ways to accomplish that, including elaborate UPDATE queries with anywhere from one to numerous REPLACE functions (even within…
How to Install VMware Tools in Red Hat Enterprise Linux 6.4 (RHEL 6.4) Step-by-Step Tutorial

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question