My task: "Compile an SQL query that outputs a specific store (enter parameter window) the age of the youngest buyer"
I´ve tried some things, but because i´m new to SQL and i have no idea what i´m doing non of them seem to work.
I´d really appreciate, if someone would help me.
Thanks!
First you need to know the fields to SELECT (or return) and the table FROM which you are querying (asking) data; let's say you have the following tables: tblStores (containing a list of stores and related info), tblCustomers (containing customers and related info, e.g. ages, names, phone numbers, etc.), and tblPurchases (containing all the purchases at all stores by all customers and related info). You want the minimum age of a customer making a purchase at a specfic store, so you could use a MIN aggregating function. You would want to join (or relate) the tables based on customers and purchases. See my INNER JOINs in the example below. Then you filter the result by the user-inputted store name (inputStoreName) using WHERE; since the inputStoreName is undefined, in Access this would cause the parameter entry popup window to appear.
SELECT list of fields or aggregating functions you want (comma-separated)
FROM list of tables the fields are in (comma-separated) and how to join the tables
WHERE list of conditions to filter the data (separated by AND or OR)
Example:
SELECT tblStores.Name, tblStores.Description, MIN(tblCustomers.age)
FROM tblStores INNER JOIN ( tblPurchases INNER JOIN tblCustomers on tblPurchases.customerID = tblCustomer.customerID) ON tblStores.storeID = tblPurchases.storeID
WHERE (tblStores.Name = inputStoreName);
I recommend checking W3 schools. They are usually helpful for most programming tasks. If you provide more info about your database, we can provide more directed help.
Related
I have looked for a similar issue with no luck. Maybe I don't know the right term to search for.
This seems so simple, but I just can't get it after spending many hours trying different approaches.
I have a dropdown to select contracts which shows some ids for related fields. How can I get those IDs to show the value of another column.
SELECT tbl_contracts.ID, tbl_contracts.contract_name, tbl_contracts.firm_id, tbl_contracts.agency_id
FROM tbl_contracts;
image of dropdown
I would like the IDs shown for agency_id and firm_id to list the company_name from their respective table "tbl_firm_agencies" where the tbl_contracts looks them up from. I've tried INNER JOINS but when I do, I can only line items to show when both agency AND firm exist, so my dropdown get cut off quite a bit.
Simply LEFT JOIN to those lookup tables as opposed to INNER JOIN. Adjust table and field names to actual ones in query below. Also, the parentheses are required in MS Access SQL.
SELECT c.ID, c.contract_name, f.firm_name, a.agency_name
FROM (tbl_contracts c
LEFT JOIN tbl_firms f
ON c.firm_id = f.firm_name)
LEFT JOIN tbl_agencies a
ON c.agency_id = a.agency_name;
Made this account just to ask about this question after being unable to find/expending the local resources I have, so I come to you all.
I'm trying to join two tables - ORDERS and CUSTOMER - as per a question on my assignment
For every order, list the order number and order date along with the customer number, last name, and first name of the customer who placed the order.
So I'm looking for the order number, date, customer number, and the full name of customers.
The code goes as such
SELECT ORDERS.ORDR_ORDER_NUMBER, ORDERS.ORDR_ORDER_DATE, ORDERS.ORDR_CUSTOMER_NUMBER, CUSTOMER.CUST_LAST, CUSTOMER.CUST_FIRST
FROM ORDERS, CUSTOMER
WHERE ORDERS.ORDR_CUSTOMER_NUMBER = CUSTOMER.CUST_CUSTOMER_NUMBER;
I've done this code without the table identifiers, putting quotation marks around ORDERS.ORDR_CUSTOMER_NUMBER, aliases for the two tables, and even putting a space after ORDR_ in both SELECT & WHERE for laughs and nothing's working. All of them keep coming up with the error in the title (ORA-00904), saying [ORDERS.]ORDR_CUSTOMER_NUMBER is the invalid identifier even though it shouldn't be.
Here also are the tables I'm working with, in case that context is needed for help.
Anyway, the query that produces the result you want should take the form:
select
o.ordr_order_number,
o.ordr_order_date,
c.cust_customer_number,
c.cust_last,
c.cust_first
from orders o
join customer c on c.cust_customer_number = o.ordr_customer_number
As you see the query becomes a lot easier to read and write if you use modern join syntax, and if you use table aliases (o and c).
You have to add JOIN or INNER JOIN to your query. Because the data comes from two different tables the WHERE clause will not select both.
FROM Orders INNER JOIN Customers ON Orders.order_Customer_Number = Customer.Cust_Customer_Number
I have created a database for users to "follow" TV Shows, I need to create a form to display each show and all the relevant information to that specific show.
The four tables I have are as follows:
Shows (Main Table),
Networks,
ShowGenres (Links multiple genre's to one show),
Genres.
The relationships and all fields are shown in the image below.
Currently I have a page which displays the following information:
showID, showName, showAired, networkName, showStatus, showRuntime, showSeasons, showEpisodes, showOverview.
Ideally i'd like to have a List box to display an array of the genre's associated with the specific show. I have tried for quite a while to come up with a query to do this, the closest I managed to get showed the relevant information but added duplicate pages.
Here's my latest attempt:
SELECT * FROM Shows A
INNER JOIN Networks B ON B.networkID = A.networkID
INNER JOIN ShowGenres C ON C.showID = A.showID
INNER JOIN Genres D ON D.genreID = C.genreID;
Any help would be appreciated, thanks in advance.
One has to appreciate the presentation level logic that can be used in conjunction with the data logic. Very generically - in the 1:Many - - your query of fields that include both fields will repeat the 1 table values with each of the Many records. That can not be altered via any query design as it is inherent in the data logic.
But at the presentation level you can control the display. Using a report - the data source can be the query - but report properties offer grouping whereby you can put the 1 field value as the group header - thus displaying just once; and then below it list all the many records.
It is not a list box per se though depending on how creative one gets with reports/sub reports one could potentially make that style. But in the end you must work this at the presentation level.
One method is to use exists:
select g.*
from genres as g
where exists (select 1
from showgenres as sg inner join
shows as s
on sg.showID = s.showID
where sg.genreID = g.genreID and
s.showName = ?
);
I'm creating an archive for Academic Papers. Each paper may have one author, or multiple authors. I've created the tables in the following manner:
Table 1: PaperInfo - Each row contains information on the paper
Table 2: PaperAuthor - Only Two Columns: contains PaperID, and AuthorID
Table 3: AuthorList - Contains Author Information.
There is also a Table 4 which is linked to Table 4, which contains a list of Universities which the author belongs to, but I'm going to leave it out for now in case it gets too complicated.
I wish to have a Query which will link all three tables together, and display Paper Information of the recordset in a table, with columns such as these:
Paper Title
Paper Authors
The column "Paper Authors" is going to contain more than one authors in some cases.
I've wrote the following query:
SELECT a.*,b.*,c.*
FROM PaperInfo a, PaperAuthor b, AuthorList c
WHERE a.PaperID = b.PaperID AND b.AuthorID = c.AuthorID
So far, the results I've been getting for each row is one author per row. I wish to contain more authors in one column. Can this be done in anyway?
Note: I'm using Access 2010 as my database.
In straight SQL the answer unfortunately is that it isn't possible. You would need to use a processing language in order to get the result you are after.
Since you mention you are using Access 2010 please refer to this question: is there a group_concat function in ms-access?
Particularly, read the post which points to http://www.rogersaccesslibrary.com/forum/generic-function-to-concatenate-child-records_topic16&SID=453fabc6-b3z9-34z6zb14-a78f832z-19z89a2c.html
You probably need to implement a custom function but the 2nd url does what you are looking for.
This functionality is not part of the SQL standard, but different vendors have solutions for it, see for instance Pivot Table with many to many table, MySQL pivot table.
If you know the maximum number of authors per paper (for example 3 or 4), you could get away with a triple or quadruple left join.
What you are after is an inner join.
An SQL JOIN clause is used to combine rows from two or more tables, based on a common field between them.
The most common type of join is: SQL INNER JOIN (simple join). An SQL INNER JOIN return all rows from multiple tables where the join
condition is met.
http://www.w3schools.com/sql/sql_join.asp
You may want to combine the inner join with a group to give you 1 paper to many authors in your results.
The GROUP BY statement is used in conjunction with the aggregate
functions to group the result-set by one or more columns.
http://www.w3schools.com/sql/sql_groupby.asp
I need to find the sum of the prices of a number of products, however the prices are stored in a different table to products that need pricing.
But, there is a catch, it needs to select these items based on criteria from a third table too.
So, I need the sum of the price of all products in Table 1 where CutID in Table 2 = 001.
Table 1 and Table 2 are linked on SCID, one to many respectively.
If this makes no sense tell me and I will try to clarify?
Thanks,
Bob P
Based on your question, I don't think there's a need for VBA. Excel formulas should be sufficient.
Add a few columns to your primary table. In these columns, use vlookup() to get all your information in one place, including the criteria.
If you only need to sum based on one criteria, use sumif(). If there's multiple criteria, use sumproduct().
Generally, with Access, I initially try to work with something as close a possible to a standard SQL query for ease of maintenance and portability. This ran for me in Access 2010:
SELECT Products.ProductID, Sum(Prices.Price) AS PriceSum
FROM Prices INNER JOIN (Critera INNER JOIN Products ON Critera.SCID = Products.SCID) ON Prices.ProductID = Products.ProductID
WHERE Critera.CutID="001"
GROUP BY Products.ProductID;
Please let us know if that works with your data (I'm not sure of your column names, either).