Hey all first post here. I'm utterly lost on our assignment in my web database integration with c# course. My DB is a simple gradebook outlined below. The assignment is to search on an aspx page, and go to a search result page that show's in gridview the results of the DB query. We need to search for classes by department name and also a separate search page for searching by class name.
I know I have to join the tables somehow with sql, but can't recall how. I've been out sick playing catch up now that I'm back. Below is my DB outline, PK is primary KEY.
Department
DepartmentID PK - linked to Table Class 1tomany
DepartmentName
Class
ClassID PK
ClassName
DepartmentID
CreditHours
I am lost when it comes to which page gets what datasources as well, the input search page with the txtbox for the search, or the search results page that has the results? Using Visual Studio and Microsoft Access as required by the course, thank you all!
EDIT Cindy was kind enough to help me on the inner join sql I was looking for, now if I can figure out the datasources I'm golden from there. Thanks Cindy!
You actually have several questions. I can answer one of them. But honestly, you'd be better off asking your teacher or a classmate for help.
To see all the classes and their department names,
SELECT ClassID, ClassName, CreditHours, class.DepartmentID, DepartmentName
FROM Class
INNER JOIN Department ON Department.DepartmentID = Class.DepartmentID
What this does is collect all the classes and connect them to their departments, matching ON the departmentID field that's stored as part of the class row. Here's a good explanation. https://support.office.com/en-in/article/Join-tables-and-queries-3f5838bd-24a0-4832-9bc1-07061a1478f6
Related
If I was given a question in an exam, where I would explain a piece of code from Microsoft Access SQL Query, without any external data or information.
How would I explain the following code in simple/plain English, I just want to get an idea because this is my first time explaining a code:
SELECT last_name, department_id, job_id
FROM employees
WHERE department_id IN
(
SELECT department_id
FROM departments
WHERE location_id = 1700
);
Is this a good explanation to a layman:
The following code: asks us to list employees' last name, their job at each department and their job identity. For each department that has a location ID equals/equivalent to '1700'. Would this be a great explanation?
SQL means Structured Query Language. Another word for "Query" is just "Question". Just about every query is written to provide a set of data that answers a question.
When you're explaining a code sample, or trying to figure out some code you inherited for that matter, a good place to start is to start by trying to figure out what question the results of the query were intended to answer. If you were sitting at your computer and somebody came up and asked you a question, what question would that be that would result in you writing that block of code? Oftentimes, just that question alone is enough of an explanation for a layperson.
Here, I'd say a fair start would be something along these lines.
This code answers the question, "What are the last names, department IDs and job IDs of everyone whose department is at location 1700?"
When giving a technical explanation, you take it to the next step. How does this code go about answering the question that was asked? This is the nuts and bolts of how the query works, as opposed to what it's supposed to do.
So, technically:
This code uses a sub-query against the departments table, which includes a location_id column, to identify all the departments at location_id = 1700. Then it uses the department list from the sub-query to get the last_name and job_id data from the employees table, using the department_id list as a filter.
As per my point of view, you need to explain the following thing
This query type is a subquery
This query provides the employee list.
This employee list is base on department and only those department need to consider which location id is 1700
So in a short way, you can say like this query give a list of employee which work on the specific location.
I hope you got this answer as correct answer.
I think a pithier explanation would be along the lines:
Fetch certain information about employees whose department is at location 1700.
I'm new to MS Access and am trying to speed up a data gathering process that is taking forever in Powershell. In Powershell I have 10 or so web API calls to get data and each comes back as an object with multiple properties (fields.) Each set of data has related fields to 1 or more of the other sets of data. Getting the data is very quick but piping an array of objects to where-object to select-object takes over an hour and there's really not that much data. Each object contains 500-1500 "records" and 5 to 10 "fields" so I thought why not export that data and use something that's intended to search through data to do the job? I exported each object as a separate .CSV file. So enter MS Access..
I imported each of the CSV's as a separate table (easy enough.) I'm going to simplify this down for this example to the following 3 tables:
[Tables]https://i.stack.imgur.com/UCH1F.jpg
Every table has fields that relate it over to other tables. Pretty much there's some sort of Id field in every table that is related to another Id field in a different table that I need to pull a field called "name" from. I'm trying to follow the bread crumbs from the Player name to it's Network name to it's Application name, to it's Layout name, etc... I want to build a query that I would eventually just be able to export as an Excel file. I also would prefer to just write out the SQL unless it's really easier to to understand the visual query builder. I'm looking to build a sheet with the following information:
Player's Name would include all names from the Players table and getting just that data makes sense to me. SELECT Name AS PlayerName FROM Players Everything else, not so much. I feel like this will end up being some mega query as I get deeper into related table after related table. In Excel, it would be straightforward using Vlookups across tabs but that doesn't seem to be the best approach. Given the info above, I'm trying to achieve the following output:
Result table
Any help with strategy and syntax greatly appreciated!
You're looking for the JOIN clause.
SELECT
Players.Name PlayerName, Networks.Name PlayerNetwork, Applications.Name ApplicationName
FROM
Players
LEFT OUTER JOIN
Networks
ON
Networks.ID = Players.NetworkId
LEFT OUTER JOIN
Applications
ON
Applications.Id = Players.ApplicationID
I am trying to write a query that 1) works and 2) shows meaningful information.
However, I can't seem to complete both scenarios. Both bits of code do work to a degree. My SQL query does work by showing all the useful information a user wants but when you click the edit button it doesn't link properly so it won't allow the user to update that row. The other shows only keys and rowid but when you click edit does show the information and allows it to be updated.
So as not to get another down-voted question, I have taken pictures of each scenario to show the problem, but, ultimately, I need to show meaningful information: an id or key isn't meaningful to the vast majority of users.
Here is my code
SELECT APPLICATIONS.APP_ID, APPLICATIONS.SRN, STUDENTS.SURNAME, STUDENTS.FORENAME, APP_STATUS.STATUS, METHODS.METHOD, JOBS.JOB_TITLE, APPLICATIONS.APP_DATE
FROM APPLICATIONS
JOIN STUDENTS
ON APPLICATIONS.SRN = STUDENTS.SRN
JOIN APP_STATUS
ON APPLICATIONS.STATUS_ID = APP_STATUS.STATUS_ID
JOIN METHODS
ON APPLICATIONS.METHOD_ID = METHODS.METHOD_ID
JOIN JOBS
ON APPLICATIONS.JOB_ID = JOBS.JOB_ID;
and here are the pictures of it in action
below is the code that does not show meaningful information but does work.
select "ROWID",
"APP_ID",
"SRN",
"STATUS_ID",
"METHOD_ID",
"JOB_ID",
"APP_DATE"
from "#OWNER#"."APPLICATIONS"
If i knew how to properly use rowid i am sure this is a simple feat but i dont so if i could get any help it would be useful
//edit
who ever renamed this to Application Expression why? what i am using is Apex Application Express it was relevant information that got changed to something wrong which might make it hard for someone with a similar problem to find later.
In the second, simple query, apex can determine which table (and record) you are trying to edit.
In the first query, with the joins, it can't tell which of the five tables in query you want to edit. You probably want to have the edit link pass the primary key of the row from APPLICATIONS to the child page. You would need to build into that page any logic (lists of values etc) that map lookup tables (such as status) to the values needed in the APPLICATIONS table.
I have a timecard file that list the daily hours for each employee. I have figured out, using a query, how to get the total number of hours but I also need the total number of employees. I have searched here and on other places and tried just about everything and nothing works. I am sure it is something pretty simple but I just cannot seem to get the total number of employees. Any help will be greatly appreciated.
The main file is called Timecards and I link to a file call Employees using the field employee number to get the employee name. There are other fields in Timecards namely "Job No", "Job Description" and "Type of Hours"( such as regular and overtime) that I wanted on the summary report but I did not realize that a employee could have two entries in those fields. So that is why I could not get the total employees to come out right when using those fields.
I was finally able to create a query and print a report with the total employees using fields that only appear once in the Timecards file. So unless someone knows how to count total lines is a report I will stick with the report I have that works.
I agree with Vladimir, it helps to post what you expect to see and what kind of tables you are working with. However, I have been in the same situation. Maybe this is a good starting point in SQL
SELECT COUNT(*) AS TotalNumberEmployees FROM TheTableShowingEmployees;
Posting a question with:
A problem statement
A list of expected results
Sample Code tried
Table structures involved (Including relevant fields, data types, and tableNames)
Will get you better results. Show your work, we'll show you ours!
Given limited information so far this is the best I can come up with
I use a left join incase some of the employees haven't reported hours yet and you want all employees.
I use coalesce to change null hours to 0.
I assume that Employees Table exists and it joins to timecard on Employee_no.
I assume firstName and LastName are in the
employeetable
.
SELECT coalesce(Sum(T.hours),0) AS SumOfhours, E.FirstName, E.LastName
FROM Employees E
LEFT JOIN Timecards T
on T.Employee_no = E.Employee_no
GROUP BY E.FirstName, E.Last_name
Also note you can edit your question don't comment on it; it makes it difficult to follow.. and last but not least .... Welcome to SO!
Well after much searching and testing I finally found a post from 2009 that took care of my problem.
`If you want to count groups, you might need to add a running sum text box in
the group header. For instance, if your report contains orders and order
details but you want to count the number of unique orders, you can't use a
text box in the report footer with a control source like:
=Count(OrderID)
This expression will count orders and details.
You can add a text box in the Order header:
Name: txtOrderCount
Control Source: =1
Running Sum: Over All
Visible: No
Then add a text box in the Report Footer section:
Control Source: =txtOrderCount
Duane Hookom
Microsoft Access MVP`
Thanks for all the help.
I am writing a program that performs operations on a database of Football matches and data. One of the issues that I have is that my source data does not have consistent naming of each Team. So Leyton Orient could appear as L Orient. Most of the time this team is listed as L Orient. So I need to find the closest match to a team name when it does not appear in the database team name list exactly as it appears in the data that I am importing. Currently in my database I have a table 'Team' with a data sample as follows:
TeamID TeamName TeamLocation
1 Arsenal England
2 Aston Villa England
3 L Orient England
If the name 'Leyton Orient' appears in the data being imported I need to match this to L Orient and get the TeamID 3. My question is, can I use the LIKE function to achieve this in a case where the team name is longer than the name in the database?
I have figured out that if I had 'Leyton Orient' in the table and was importing 'L Orient' I could locate the correct entry with:
SELECT TeamName FROM Team WHERE TeamName LIKE '%l%orient%';
But can I do it the other way around? Also, I could have an example like Manchester United and I want to import Man Utd. I could find this by putting a % sign between every character like this:
SELECT TeamName FROM Team WHERE TeamName LIKE '%M%a%n%U%t%d%';
But is there a better way?
Finally, and this might be better put in another question, I would like not to have to search for the correct team when the way a team is named is repeated, i.e. I would like to store alternative spellings/aliases for teams in order to find the correct team entry quickly. Can anybody advise on how I might approach this? Thanks
The solution you are looking for is the FULL TEXT SEARCH, it'll require your DBA to create a full text index, however, once there you can perform much more powerful searches than just character pattern matching.
As the others have suggested, you could also just have an Alias table, which contains all possible forms of a team name and reference that. depending on how your search is working, that may well be the path of least resistance.
Finally, and this might be better put in another question, I would like not to have to search for the correct team when the way a team is named is repeated, i.e. I would like to store alternative spellings/aliases for teams in order to find the correct team entry quickly. Can anybody advise on how I might approach this? Thank
I would personally have a team table and a teamalias table. Use relationships to marry them up.
I believe the best way to prevent this, is to have a list of teams names displayed in a dropdown list. This will also let you drop validation for the team name. The users can now only choose one set team name and will also make it much easier for you working in your database. then you can look for the exact team name as it appears in your database. i.e.:
SELECT TeamName FROM Team WHERE TeamName = [dropdownlist_name];