Query multiple values from tables with multiple conditions

Question

I'm trying to display the addresses from an employee record. There are two tables: employees and emp_addresses. There can be any number of addresses which is defined by the address type.
What I want to do is get all the employees and all of the addresses for that employee in the same result.
Addresses table:
emp_id
address1
address2
address3
city
state
zip
type (either H for 'home' or W for 'work')
I would like the result set to be:
emp_id | home_address1 | home_city | work_address1 | work_city
Do I have to use a join? I'm not sure how to go about it.

Answer 1

Hi,
user9179751 wrote:
I'm trying to display the addresses from an employee record. There are two tables: employees and emp_addresses. There can be any number of addresses which is defined by the address typeIf there can be any number of addresses, and you want to show all of them, then you probably need String Aggregation . See this page for different ways to do it:
http://www.oracle-base.com/articles/10g/StringAggregationTechniques.php
A related topic, that usually works better with a known number of columns, is Pivoting . See these links:
SQL and PL/SQL FAQ
There are ways to make pivoting work with a variable number of columns. See this thread:
Re: Report count and sum from many rows into many columns
What exactly are your requirements? Do you rally need separate columns for each address, or is it okay to have one big VARCHAR2 column that's formatted so it looks like separate columns? If you really need separate columns, do you know an upper limit to how many (e.g., there will never be more than 5)?
What I want to do is get all the employees and all of the addresses for that employee in the same result.
Addresses table:
emp_id
address1
address2
address3
city
state
zip
type (either H for 'home' or W for 'work')
I would like the result set to be:
emp_id | home_address1 | home_city | work_address1 | work_cityWhenever yo have a question, post CREATE TABLE and INSERT statements for some sample data, and the exact results you want from that data. Showing the column names for the sample data isn;t nearly as helpful as shoiwing some actual data (with column names). Showing the header line that goes over the results isn't nearly as helpful as showing the actual results (with the header line).
Always say which version of Oracle you're using. Sting aggreagation and pivoting techiniques have changed significantly in every version since Oracle 7.
Do I have to use a join? I'm not sure how to go about it.Using a join, you could get one more address for every join, but since there could be any number of addresses, you'd need any number of joins, and that means dynamic SQL. Join probably isn't the best approach in this case.