Solved

Mysql

Posted on 2013-11-11
7
525 Views
Last Modified: 2013-11-11
I am stepping through a mysql table called trans where the date field matches a date I enter, and matching the sellerId field in trans table with a field called number and a field called date in a table called seller.  I am printing info from the trans table as well as the name field from the seller table.  I need to JOIN another table to the query so I can get a name from another table called buyer.  I will need to key on the buyer table fields of buyerID and date.  I have included below, the code I have at this point.  i get an execution syntax error that says:

systax to use near AS b ON t.buyerID = b.number where t.date='2013-04-11' AND s.date='2013-04-11'

How do I correct my query to get the buyers name from the buyer table.

        String command =
                "SELECT "
                + "t.sellerID, t.buyerID, t.head, t.descrip, "
                + "ROUND(t.weight/t.head) AS AVG_WGT, "
                + "t.weight, t.price, t.date, "
                + "s.name, "
                + "s.date, "
                + "t.type AS sexcode "
                + "FROM trans AS t "
                + "JOIN seller AS s ON t.sellerid = s.number "
-->           + "AND buyer AS b ON t.buyerID = b.number "
                + "WHERE t.date= '" + reportDate + "' "
                + "AND s.date= '" + reportDate + "' "
                + "ORDER BY s.name ASC, sexcode DESC";
       
        try {
            st = (Statement) con.createStatement();
            rs = st.executeQuery(command);

            if (!rs.isBeforeFirst() ) {
                 JOptionPane.showMessageDialog(null,
                    "No data found!");
            }
            while (rs.next()) {
                String name = rs.getString("name");

                if (rs.wasNull()) {
                    name = "";
                }
                String head = rs.getString("head");
                String desc = rs.getString("descrip");
                String avgwgt = rs.getString("avg_wgt");
                String weight = rs.getString("weight");
                String bidPrice = rs.getString("price");
                String transDate = rs.getString("date");
0
Comment
Question by:sargent240
7 Comments
 
LVL 24

Expert Comment

by:chaau
ID: 39640656
You need to use JOIN:

 String command =
                "SELECT "
                + "t.sellerID, t.buyerID, t.head, t.descrip, "
                + "ROUND(t.weight/t.head) AS AVG_WGT, "
                + "t.weight, t.price, t.date, "
                + "s.name, "
                + "s.date, "
                + "t.type AS sexcode "
                + "FROM trans AS t "
                + "INNER JOIN seller AS s ON t.sellerid = s.number "
                + "INNER JOIN buyer AS b ON t.buyerID = b.number "
                + "WHERE t.date= '" + reportDate + "' "
                + "AND s.date= '" + reportDate + "' "
                + "ORDER BY s.name ASC, sexcode DESC";

Open in new window


Please note that if buyer does not always exist for your transaction (unlikely, but just in case), you need to modify INNER JOIN to LEFT JOIN
0
 

Author Comment

by:sargent240
ID: 39640679
Great!  The syntax error went away.  The only other thing is, you will notice  the first line after the

while(rs.next()) {

statement is a

String name = rs.getString("name");

That statement puts the sellers name from the seller table into the name variable.  I am not to sure what statement to use to get the buyers name from the buyers file.  The table description is below and the buyers name is in the name field.  Can you help me with that?  Thanks

mysql> describe buyer;
+-------------+--------------+------+-----+---------+----------------+
| Field       | Type         | Null | Key | Default | Extra          |
+-------------+--------------+------+-----+---------+----------------+
| id          | int(11)      | NO   | PRI | NULL    | auto_increment |
| customer_id | int(11)      | YES  |     | NULL    |                |
| date        | date         | YES  |     | NULL    |                |
| number      | varchar(64)  | YES  |     | NULL    |                |
| name        | varchar(255) | YES  |     |         |                |
| address1    | varchar(255) | YES  |     |         |                |
| address2    | varchar(255) | YES  |     |         |                |
| city        | varchar(255) | YES  |     |         |                |
| state       | varchar(4)   | YES  |     |         |                |
| zip         | varchar(20)  | YES  |     |         |                |
| company     | varchar(255) | YES  |     |         |                |
| comment     | varchar(255) | YES  |     |         |                |
+-------------+--------------+------+-----+---------+----------------+
12 rows in set (0.00 sec)

Open in new window

0
 
LVL 35

Assisted Solution

by:mccarl
mccarl earned 100 total points
ID: 39640685
Well, first you need to actually "select" that field in your query. At the moment, the query isn't even retrieving that field yet. And then when you select it, you can just put an alias on that (just like you already have done for "AVG_WGT" or "sexcode") and then specify that alias in your rs.getString() method call.
0
What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 
LVL 48

Expert Comment

by:PortletPaul
ID: 39640695
>> I am not to sure what statement to use to get the buyers name from the buyers file.
The buyers name is available to your query via the table alias b

so:

b.name

Just include "b.name" into you select clause (perhaps instead of s.name?).


      by the way, It's the buyers table, not buyers file :)
0
 
LVL 24

Accepted Solution

by:
chaau earned 400 total points
ID: 39640696
Just add buyer name to the list of selected columns, like this:
 String command =
                "SELECT "
                + "t.sellerID, t.buyerID, t.head, t.descrip, "
                + "ROUND(t.weight/t.head) AS AVG_WGT, "
                + "t.weight, t.price, t.date, "
                + "s.name, "
                + "s.date, "
                + "t.type AS sexcode, "
                + "b.name AS buyerName "
                + "FROM trans AS t "
                + "INNER JOIN seller AS s ON t.sellerid = s.number "
                + "INNER JOIN buyer AS b ON t.buyerID = b.number "
                + "WHERE t.date= '" + reportDate + "' "
                + "AND s.date= '" + reportDate + "' "
                + "ORDER BY s.name ASC, sexcode DESC";

Open in new window

And then just use it in the code:
String buyerName = rs.getString("buyerName");

Open in new window

0
 

Author Closing Comment

by:sargent240
ID: 39640717
Thank you very much for the help.  I'm on the road again and know enough to be dangerous.
Cheers
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering 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

Suggested Solutions

This article describes how to use the timestamp of existing data in a database to allow Tableau to calculate the prior work day instead of relying on case statements or if statements to calculate the days of the week.
When table data gets too large to manage or queries take too long to execute the solution is often to buy bigger hardware or assign more CPUs and memory resources to the machine to solve the problem. However, the best, cheapest and most effective so…
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

765 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