SQL how to retrieve latest result from each joined table - sql

Question

I would like to retrieve one large table of products with the latest rows from all the joined tables via with MAX(ID) of each group (productToken) which ich unique name of the product. Joined tables are - products (store), availability (status), description (products), and price of the product. All of them contains the unique productToken and the mentioned tables can be changed over time by adding a new record (independently) so my aim is to compose one big table (with actual info about the products) via retrieving the lastest record from each table. My code is this. First added product worked well, but things got strange after adding new records to any of the tables (query has retrieved no results).
SELECT *
FROM products
JOIN productsStore ON products.productToken = productStore.productToken
JOIN productsStatus ON products.productToken = productsStatus.productToken
JOIN productsPrice ON products.produstToken = productsPrice.productToken
JOIN categories ON products.categoryToken = categories.categoryToken
WHERE products.shopToken = '$shopToken'
AND products.productID IN
(SELECT MAX(productID)
FROM products
GROUP BY productToken)
AND productsPrice.productPriceID IN
(SELECT MAX(productPriceID)
FROM productsPrice
GROUP BY produktToken)
AND productsStatus.productStatusID IN
(SELECT MAX(productStatusID)
FROM productsStatus
GROUP BY productToken)
AND produktyStore.productStoreID IN
(SELECT MAX(productStoreID)
FROM productsStore
GROUP BY productToken)
AND categories.categoryID IN
(SELECT MAX(categoryID)
FROM categories
GROUP BY categoryToken)
ORDER BY categories.categoryID DESC

Answer 1

I would like to retrieve one large table of products with the latest rows from all the joined tables
I think that you want equality conditions with correlated subqueries in the where clause rather than in conditions with aggregate queries. This lets you filter each joined table with the "latest" record for the given productToken.
SELECT *
FROM products p
JOIN productsStore psr ON psr.productToken = p.productToken
JOIN productsStatus psu ON psu.productToken = p.productToken
JOIN productsPrice ppr ON ppr.produstToken = p.productToken
JOIN categories c ON c.categoryToken = p.categoryToken
WHERE
p.shopToken = '$shopToken'
AND p.productID = (SELECT MAX(p1.productID) FROM products p1 WHERE p1.productToken = p.productToken)
AND psr.productStoreID = (SELECT MAX(psr1.productStoreID) FROM productsStore psr1 WHERE psr1.productToken = p.productToken)
AND psu.productStatusID = (SELECT MAX(psu1.productStatusID) FROM productStatus psu1 WHERE psu1.productToken = p.productToken)
AND ppr.productPriceID = (SELECT MAX(ppr1.productPriceID) FROM productsPrice ppr1 WHERE ppr1.productToken = p.productToken)
AND c.categoryID = (SELECT MAX(c1.categoryID) FROM category c1 WHERE c1.productToken = p.productToken)
If you are running MySQL 8.0 (or MariaDB 10.3 or higher), you can use ROW_NUMBER() in subqueries instead:
SELECT *
FROM (
SELECT p.*, ROW_NUMBER() OVER(PARTITION BY productToken ORDER BY productID DESC) rn
FROM products p
) p
INNER JOIN (
SELECT psr.*, ROW_NUMBER() OVER(PARTITION BY productToken ORDER BY productStoreID DESC) rn
FROM productsStore psr
) psr ON psr.productToken = p.productToken AND psr.rn = 1
INNER JOIN (
SELECT psu.*, ROW_NUMBER() OVER(PARTITION BY productToken ORDER BY productStatusID DESC) rn
FROM productsStatus psu
) psu ON psu.productToken = p.productToken AND psu.rn = 1
INNER JOIN (
SELECT ppr.*, ROW_NUMBER() OVER(PARTITION BY productToken ORDER BY productsPriceID DESC) rn
FROM productsPrice ppr
) ppr ON ppr.productToken = p.productToken AND ppr.rn = 1
INNER JOIN (
SELECT c.*, ROW_NUMBER() OVER(PARTITION BY productToken ORDER BY categoryID DESC) rn
FROM categories c
) c ON c.productToken = p.productToken AND c.rn = 1
WHERE p.shopToken = '$shopToken' AND p.rn = 1