List Customer And Product Without Sale

user_13563471 0
Viewed 44155

Need to show the following columns (3) using UNION to return:

  • All customers who do not have an invoice
  • All products that were not sold
  1. Category: Is this related to "customer" or "product"? Print "customer or "product"
  2. ID: Customer.id (category="customer") or product.id (category="product")
  3. Name: customer.customer_name (category="customer") or product.product_name (category="product")

Tables:

Customer

  • id
  • customer_name
  • city_id
  • customer_address
  • contact_person
  • email
  • phone

Product

  • id
  • sku
  • product_name
  • product_description
  • current_price
  • quantity_in_stock

Invoice

  • id
  • invoice_number
  • customer_id
  • user_account_id
  • total_price
  • time_issued
  • time_due
  • time_paid
  • time_canceled
  • time_refunded

Invoice_Item

  • id
  • invoice_id
  • product_id
  • quantity
  • price
  • line_total_price

So far have the following:

SELECT 
  category,
  CASE
      WHEN category = 'customer' THEN c.id
      WHEN category = 'product' THEN p.id
  END AS 'id',
  CASE
    WHEN category = 'customer' THEN c.customer_name
    WHEN category = 'product' THEN p.product_name
  END AS 'name'
FROM 
  (
    SELECT
        CASE
          WHEN c.id = c.id THEN 'customer'
          WHEN p.id = p.id THEN 'product'
        END as 'category'
    FROM
        customer as c
    LEFT Join -- Left join to show all customers even those with & without invoices
        invoice as i
    ON c.id = i.customer_id
    AND i.id IS NULL -- Gives me all customers who do not have an invoice
    JOIN invoice_item as ii
    ON i.id = ii.invoice_id
    Join product p
    ON p.id = ii.product_id
  ) tb1

UNION ALL

SELECT 
  category,
  CASE
      WHEN category = 'customer' THEN c.id
      WHEN category = 'product' THEN p.id
  END AS 'id',
  CASE
    WHEN category = 'customer' THEN c.customer_name
    WHEN category = 'product' THEN p.product_name
  END AS 'name'
FROM
  (
    SELECT 
      CASE
        WHEN c.id = c.id THEN 'customer'
        WHEN p.id = p.id THEN 'product'
      END as 'category'
    FROM
        product as p
    LEFT JOIN -- Left join to show all products even those that sold and not sold
        invoice_item as ii
    ON p.id = ii.product_id
    AND ii.invoice_id IS NULL -- Gives me products that didnt sell
    JOIN invoice as i
    ON ii.invoice_id = i.id
  ) tb2

Open to any suggestions as I'm stuck trying to figure out how to show the category as either "product" or "customer". Thanks in advance!

union sql
4 Answers

Considering your data model and requirements, you should try the below SQLs. You can easily perform UNION with both the SQLs.

First SQL returns this list --> All customers who do not have an invoice

select 'customer' as category, c.id as id, customer_name as name
     from customer c
     left join invoice i on c.id = i.customer_id
     where i.id is null

Second SQL returns this list --> All products that were not sold

select 'product' as category, p.id as id, product_name as name
        from product p
        left join invoice_item ii on p.id = ii.product_id
        where ii.id is null;
user_114209840

Well, it is older than 6 months but still, answer would be:

select 'customer' as category, c.id as id, customer_name as name
from customer c
left join invoice i on c.id = i.customer_id
where i.id is null 

union

select 'product' as category, p.id as id, product_name as name
from product p
left join invoice_item ii on p.id = ii.product_id
where ii.id is null;
user_104066010 
SELECT 'customer' as category,id,customer_name FROM customer 
WHERE id NOT IN(SELECT customer_id FROM invoice) 
UNION 
SELECT 'product' as category,id,product_name FROM product 
WHERE id NOT IN(SELECT product_id FROM invoice_item);
user_152890250

The actual question is all customers details even those without invoices and all products even those which are not sold.

SELECT    c.customer_name,
          p.product_name,
          Coalesce((ii.quantity), 0) AS quantity
FROM      customer c
LEFT JOIN invoice i
on        c.id = i.customer_id
LEFT JOIN invoice_item ii
ON        ii.invoice_id = i.id
LEFT JOIN product p
ON        ii.product_id = p.id
ORDER BY  c.customerid,
          p.product_id,
          ii.id
UNION
SELECT 'N/A',
       p.product_name,
       0
FROM   products p 
ORDER BY p.id
user_110613500
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