?
Solved

SQL Subquery Help

Posted on 2012-03-29
5
Medium Priority
?
298 Views
Last Modified: 2012-03-29
Hi Guys and Gals

I have 2 SQL statements that i've created in MSAccess but ideally i want just one SQL.

Statement 1:

SELECT Roster.member, Attendance.date
FROM Roster, Attendance
GROUP BY Roster.member, Attendance.date;

Open in new window


This SQL creates a list of all members and all possible dates.


Statement 2:

SELECT JAGM1.member, JAGM1.Date
FROM (Attendance RIGHT JOIN JAGM1 ON (Attendance.member = JAGM1.member) AND (Attendance.date = JAGM1.date)) LEFT JOIN Roster ON JAGM1.member = Roster.member
WHERE (((JAGM1.Date)>=([Roster].[join_date])) AND ((Attendance.member) Is Null));

Open in new window


This query uses the result of JAGM1 (which is generated from statement 1) to find some unmatched records that fall on or after the join date.

Is it possible to combine the two SQL statements into one?

James
0
Comment
Question by:Delerium1978
  • 3
  • 2
5 Comments
 
LVL 61

Expert Comment

by:mbizup
ID: 37782370
Try this (you may have to rename your extsing query1 to something like JAGM1_Backup, sinc JAGM1 is used as an alias in this):


SELECT JAGM1.member, JAGM1.Date
FROM (Attendance RIGHT JOIN 
(SELECT Roster.member, Attendance.date
FROM Roster, Attendance
GROUP BY Roster.member, Attendance.date) AS JAGM1
ON (Attendance.member = JAGM1.member) AND (Attendance.date = JAGM1.date)) LEFT JOIN Roster ON JAGM1.member = Roster.member
WHERE (((JAGM1.Date)>=([Roster].[join_date])) AND ((Attendance.member) Is Null));

Open in new window

0
 

Author Comment

by:Delerium1978
ID: 37782392
syntax error between line 5 & 6 - error in FROM clause.
0
 
LVL 61

Accepted Solution

by:
mbizup earned 2000 total points
ID: 37782415
Try this:
SELECT J1.member, J1.Date
FROM (Attendance RIGHT JOIN 
(SELECT Roster.member, Attendance.date
FROM Roster, Attendance
GROUP BY Roster.member, Attendance.date) AS J1
ON (Attendance.member = J1.member) AND (Attendance.date = J1.date)) LEFT JOIN Roster ON J1.member = Roster.member
WHERE (((J1.Date)>=([Roster].[join_date])) AND ((Attendance.member) Is Null));

Open in new window

0
 
LVL 61

Expert Comment

by:mbizup
ID: 37782479
Cleaned up a little:

SELECT J1.member, J1.Date
FROM (Attendance RIGHT JOIN
(SELECT Roster.member, Attendance.date
FROM Roster, Attendance
GROUP BY Roster.member, Attendance.date) AS J1
ON Attendance.member = J1.member AND Attendance.date = J1.date) LEFT JOIN Roster ON J1.member = Roster.member
WHERE J1.Date >= Roster.join_date  AND member Is Null
0
 

Author Closing Comment

by:Delerium1978
ID: 37782521
Perfect - many thanks!!!
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

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.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

MSSQL DB-maintenance also needs implementation of multiple activities. However, unprecedented errors can hamper the database management. In that case, deploying Stellar SQL Database Toolkit ensures fast and accurate database and backup repair as wel…
Article by: Tammy
MySQLTuner is a script written in Perl that allows you to review a MySQL installation quickly and make adjustments to increase performance and stability. The current configuration variables and status data is retrieved and presented in a brief forma…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …

569 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