Are you trying to get the secretary's name as the master table?
mlmcc
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Tricky SQl needs simplifying and Im too simple
I have a SQL statment that runs against a MySQL 4.0 from a crystal report (XI). The report runs slowly and I think its because the SQL is too complicated. Can anyone help to simplify it. The table structure is below the query
SELECT User.FullName,User_1.FullN
FROM User AS User_1
INNER JOIN (
((User INNER JOIN Customer ON User.UserID = Customer.UserID)
INNER JOIN Secretary ON Customer.CustomerID = Secretary.CustomerID)
INNER JOIN Task ON Secretary.SecretaryID = Task.SecretaryID)
ON User_1.UserID = Secretary.UserID;
Table:USER1
UserID -PK
FullName
Table:USER
UserID -PK
FullName
Table:CUSTOMER
CustomerID -PK
UserID
Table:SECRETARY
SecretaryID -PK
UserID
CustomerID
Table:TASK
TaskID -PK
SecretaryID
TimePosted
TimeAccepted
TimeReturned
TimeCompleted
NumLines
Please help as the clients are baying for my blood.....
Seb
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Answers
So the aim of the query is to get a report that details which tasks were done by which member of which customer (the customer is a company).
The user is related to user 1 as a many user1 to one user relationship
user-customer is a one to one relationship
customer to secretary is a many secretaries to one customer relationship.
Secretary to task is a many tasks to one secretaries relationship
Im not sure that I can get an EXPLAIN statement for the SQL
Does this help?
Seb
I think you have made your relationships a little too complicated. What is the difference between a company and a user? If they are a 1-1 relationship, what is the reasoning behind separating the data?
Each customer (a company, or YOUR customer) has a user account (1-1 relation). Each customer has a number of secretaries (1-many). Each secretary can have a number of tasks (1-many). So why are you relating secretary to the user? By your description, the user should be dependent only on the company, or vice versa.
Given what you've described, you have a task that was completed by a secretary. That secretary is a child of a customer, which should also yield the user. In the secretary table, you also relate it directly to the user...why? The query below reflects how I understand the relationships. Please explain further regarding the nature of the relationship between Customer and User.
SELECT * FROM Task a INNER JOIN Secretary b ON a.SecretaryID=b.SecretaryI
The user table contains the fullName of every user, whether they are a customer or a secretary. I want to group all the tasks done by each secretaries (listed by name- an attribute of the user table) under each customer (and list the customer name, which I can only get from the user table). How do I get the secretary fullName from the User table which I have already used?
Seb
I understand now. I disagree with using the user table to show customer name, since you equate a customer with a company, but the relationship makes more sense. Try this:
SELECT user_sec.FullName,user_cus
Task.TimeAccepted,Task.Tim
Secretary.SecretaryID
FROM Task INNER JOIN Secretary ON Task.SecretaryID=Secretary
INNER JOIN Customer ON Customer.CustomerID=Secret
INNER JOIN User user_sec ON Secretary.UserID=user_sec.
INNER JOIN User user_cust ON Customer.UserID=user_cust.
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by: routinetPosted on 2008-05-17 at 18:02:59ID: 21591243
Please explain a little about the nature of your table relationships and the goal of the query. Also, post the results of EXPLAIN for this query.