Combining result of three queries to form a single table

Question

Hi ..
I have three select queries. Each of them returns a single column. I want the result of these queries into a single table..
I tried this way..
select * from
(first select),(second select),(third select);
this gives duplicate rows... Any held would be appreciated

Answer 1

Hi,
Welcome to the forum!
1005370 wrote:
Hi ..
I have three select queries. Each of them returns a single column. I want the result of these queries into a single table..Remember that the people who want to help you don't know as much about your tales and your application as you do; in fact, they might not know anything at all about them.
You might ask a friend: "How can I get to that restaurant we went to last week?", and expect to get a good answer, because your friend knows where you are starting from, and knows, from that brief description, where you want to go. But would you expect a stranger on the internet to answer the exact same question? Of course not! A stranger on the internet wouldn't know where you're starting from, or where you want to go. How could a stranger give you directions with only that information?
SQL code is like directions. A SQL query can tell you how to get a certain result set from a certain sample data set. No matter how well someone knows SQL, they need to know something about the data in a problem and the results needed fom that data before they can start writing a query to get those results from that data.
Whenever you have a question, you need to post a little sample data (CREATE TABLE and INSERT statements) for all tables involved, and the results you want from that data in this case, the contents of the new table).
All this and more is in the forum FAQ {message:id=9360002}. Take a few minutes now to read that page. It can realy help you get better results faster on this forum.
I tried this way..
select * from
(first select),(second select),(third select);
this gives duplicate rows... Any held would be appreciatedIf duplicate rows are the only problem, then just add DISTNCT t the main SELECT clause:
select DISTINCT  *
from    (first select)
,     (second select)
,     (third select)
;However, I'll bet duplicate rows aren't really the problem. It's much more likely that the problem is duplicate values in just 1 column.
Again, how to get the output you want from your data depends on your data and the output you want. Post CREATE TABLE and INSERT statements for some sample data, and the complete results you want from that data. Explain how you get those results from that data.