I have a member activity table like below:
In this table although the product names are different, multiple products can be mapped to similar products like below:
Based on the member activity table, i need to find the first activity date for every member by product. the output would look like:
Suppose your mapping is stored in the mapping table.
select a.member_id,m.mapped_product, min(a.activity_date) as activity_date
from member_activity a
inner join (select distinct product, mapped_product from mapping m) m on a.product=m.product
group by a.member_id,m.mapped_product
Related
I am building an application to manage an inventory and I have a problem when creating my tables for the database (I am using PostgreSQL). My problem is the following:
I have two tables, one called 'products' and one called 'users'. Each one with its columns (See image). I want to create a third table called 'product_act_register' , which will keep a record of activity of the products and has with it the columns id, activity_type, quantity, date. But, I want to add other columns which are taken from the table 'users' and 'products'.
It should look like this (Image)
Where product_id, product_name, product_category, product_unit are taken from the table 'products' and the column 'user_id' is taken from the table 'users'.
How can I do this with PostgreSQL ?
Your description and your precise goals are very unclear. You didn't tell us what should happen in the different cases (only a product exists or only a user exists or none exist or both exist). You also didn't tell us how the other columns not coming from these tables should be filled. You furthermore didn't tell us how the tables users and products depend on each other. Basically you con do something like this if you only want to do an insert if both tables have an entry:
INSERT INTO product_acts_register
SELECT 1,'ActivityType1',p.id, p.name, p.category,
p.unit, u.id, 100, CURRENT_DATE
FROM products p JOIN users u ON p.id = u.id;
(Since you didn't tell us how or if to join them, I assumed to join on their id column)
If you don't care about this, but want to insert an entry for any possible combination of users and products, you can just select both tables without joining:
INSERT INTO product_acts_register
SELECT 1,'ActivityType1',p.id, p.name, p.category,
p.unit, u.id, 100, CURRENT_DATE
FROM products p, users u;
You can replicate this here and try out other commands: db<>fiddle
Please be more precise and give us more information when asking the next question.
I have two tables:
A Billing table, and a Customer table.
The Billing table and customer table both share a common attribute of Customer Number.
Billing Table
I'm trying to create a view that will retrieve the customer code and bill number for the most recent invoice date. I'm having trouble ordering my query.
This is what I have so far.
CREATE VIEW RECENT_ORDER
AS
SELECT
c.Customer_Num, b.Bill_Num
FROM CUSTOMER c
INNER JOIN BILLING b ON c.Customer_Num = b.Customer_Num
WHERE c.Fname='Jess' AND c.Lname='Hanks'
HAVING MAX(b.Bill_Date);
I have also tried putting the 'HAVING' portion as a WHERE statement.
This should get your answer:
CREATE VIEW RECENT_ORDER
AS
SELECT c.customer_num, b.bill_num
FROM customer c
JOIN billing b ON c.customer_num = b.customer_num
WHERE b.bill_date =
(SELECT MAX(bill_date) FROM billing WHERE customer_num = b.customer_num)
AND c.Fname='Jess' AND c.Lname='Hanks'
Though normally I wouldn't expect to create a view that limits results to just one customer!? Remove the last line AND c.Fname ... if you intend to get the most recent result for any/all customers. Note that you may get multiple results for a customer if they have more than one invoice on the same date.
Here is a basic illustration of the issue
I have two tables I want to join.
One table contains information about a product sale. (product_sales)
The other contains keys for the names of locations. (states_keys)
Both contain the same column 'state_key'.
The states_keys table has an additional column called 'state_names'.
I would like to join the table so that I can view the accurate state name that coordinates to each product sale.
So, I want to join where each table's state_key are = but display the additional column state_names from table states_keys.
SELECT product_sales.*, state_names
FROM product_sales
INNER JOIN states_keys
ON product_sales.state_key = states_keys.state_key
Try with something like this:
Select prod.*, state.state_names
from product_sales prod
inner join states_keys state on state.state_key = prod.state_key
I have a table "Trans" which contains the acccountNumbers and other dimensions like Facility , Status etc.
I need to create a calculated member in SSAS where the logic would be
Count of Accounts in a group / Total accounts.
Count of Accounts in a group would be based on the Dimension filter I provide.
For e.g. If I provide the facility then I need the Count of accounts (In numerator) group be different facilities.
Likewise If I provide the Status I would need the numerator to be grouped as per the data in Status table.
Table Name
Trans (AccountNumber, facility,Status) -- This is fact table
Dimension tables
Facility( Id, Facility_name)
Status (Id, Status)
Not sure how to go about it.
EXISTING is a useful function, so maybe something like:
COUNT(
EXISTING [AccountNumber].[AccountNumber].MEMBERS
)
Here's what I want to achieve:
I have a number of categories, each one with products in it.
I want to produce a report that shows various information about those products for each category. So I have a query that looks something like:
select
category,
count(products),
sum(product_price),
from product
group by category
So far so good.
But now I also want to get some category-specific information from a table that has information by category. So effectively I want to say:
join category_info on category
except that that will create a join for each row of each group, rather than just one join for each group.
What I really want to be able to say to sql is 'for each group, take the distinct category value, of which there's guaranteed to only be one since I'm grouping on it, and then use that to join to the category info table'
How can I accomplish this in SQL? By the way, I'm using Oracle 10g..
Many thanks!
select a.category, a.Count, a.SumPrice
ci.OtherColumn
from (
select p.category,
count(p.products) as Count,
sum(p.product_price) as SumPrice,
from product p
group by category
) a
inner join category_info ci on a.category = ci.category