Getting list of items from one table indirectly associated with another

Question

I have a database containing 3 tables. One is a list of employees, one is a list of companies that are clients and another is the projects each employee is working on. The projects table is the only connection between the employee and the company. An employee is working on a project for a specific company. I need to find a list of companies someone is working for given the employee's ID. How would I do this? I've done direct queries before, but never anything that involves going through another table. I have an explanation of my tables below.
Employee ------------- Project ----------- Company
Name ------------------ Name --------------- Name
ID -------------------> EmployeeID
------------------------ CompanyID ----------> ID

Answer 1

I did something like this..It works for MS Access 2000 but not SQL Server 2000. (http://forum.java.sun.com/thread.jsp?forum=48&thread=270102)
What I have is one main table, joined to 3 other tables, and each one of them have one category in common, and they are in a many-to-one relationship with the main table.
The Function category in the main table is the same as the Function_Name category in the others
For ex)
Main Table
Function Description Context Actions Notes
sample blah blah blah blah
Table 1
Function_Name ArgName ID
sample x 1
sample y 2
Table 2
Function_Name Return_Codes ID
sample z 1
sample m 2
sample n 3
Table 3
Function_Name Function_Called ID
sample t 1
What i needed to do was retrieve all these records from the different tables if I only had the value to the Name field.
This is the code I used:
<code>
String dataSourceName = "<fill in your dataSourceName>";
String dbURL = "jdbc:odbc:" + dataSourceName;
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}catch (Exception e){System.out.println("Couldn't connect to driver.");}
try{
Connection con = DriverManager.getConnection(dbURL, "","");
Statement stmt = con.createStatement();
//gui3.staticName is the data in the Function or Function_Name Field
ResultSet result = stmt.executeQuery("SELECT * FROM function_description WHERE (((Function)='"+ gui3.staticName + "'));");
while(result.next()){
function.setText(result.getString("Function"));
description.setText(result.getString("Description"));
notes.setText(result.getString("Notes"));
actions.setText(result.getString("Actions"));
context.setText(result.getString("Context"));
ResultSet result2 = stmt.executeQuery("SELECT Return_Codes FROM return_code_description WHERE (((Function_Name)='"+ gui3.staticName + "')) ORDER BY Return_Codes ASC;");
while(result2.next()){
rCodes.addElement(result2.getString("Return_Codes"));
ResultSet result3 = stmt.executeQuery("SELECT ArgName FROM Arg WHERE (((Function_Name)='"+ gui3.staticName + "')) ORDER BY ArgName ASC;");
while(result3.next()){
args.addElement(result3.getString("ArgName"));
ResultSet result4 = stmt.executeQuery("SELECT Function_Called FROM Function_Called WHERE (((Function_Name) = '"+ gui3.staticName + "')) ORDER BY Function_Called ASC;");
while (result4.next()){
fcall.addElement(result4.getString("Function_Called"));
}catch (SQLException e) {System.out.println(e.getMessage());}
</code>
So when you get the ID can't you Select the data from the products table that matches it, and then take the Name field for that and search for it in the Company table? I think you can do embedded search statements. another way would be
Select <blah>
while(result.next)
Select <blah>
hope this helps