how to get last row from table 2 using left join mysql - mysql

Question

I have tow tables tbl_product_checkout and tbl_product_checkout_status in which I want to get the last row from tbl_product_checkout_status
//tbl_product_checkout
product_checkout_id user_id product_checkout_order_no
-----------------------------------------------------------
1 1 ORD123456
//tbl_product_checkout_status
checkout_status_id product_checkout_id checkout_status_check
------------------------------------------------------------------
1 1 Dispatched
2 1 Delivered
I have tried using the following query
SELECT *
FROM tbl_product_checkout pc
LEFT
JOIN tbl_product_checkout_status cs
ON cs.product_checkout_id = pc.product_checkout_id
WHERE pc.user_id = 1
GROUP
BY pc.product_checkout_id
ORDER
BY cs.checkout_status_id DESC
but the output for above query is,
user_id product_checkout_order_no checkout_status_check
-------------------------------------------------------------
1 ORD123456 Dispatched
but I want the result as,
user_id product_checkout_order_no checkout_status_check
-------------------------------------------------------------
1 ORD123456 Delivered

Answer 1

Add a where = max sub query eg
DROP TABLE IF EXISTS tbl_product_checkout,tbl_product_checkout_status;
CREATE TABLE tbl_product_checkout(product_checkout_id INT, user_id INT, product_checkout_order_no VARCHAR(20));
INSERT INTO tbl_product_checkout VALUES
( 1 , 1 , 'ORD123456');
CREATE TABLE tbl_product_checkout_status(checkout_status_id INT, product_checkout_id INT, checkout_status_check VARCHAR(20));
INSERT INTO tbl_product_checkout_status VALUES
( 1 , 1 , 'Dispatched'),
( 2 , 1 , 'Delivered');
SELECT * FROM
tbl_product_checkout T1
LEFT JOIN tbl_product_checkout_status T2 ON T1.PRODUCT_CHECKOUT_ID = T2.PRODUCT_CHECKOUT_ID
WHERE T2.CHECKOUT_STATUS_ID = (
SELECT MAX(T3.CHECKOUT_STATUS_ID)
FROM tbl_product_checkout_status T3
WHERE T3.PRODUCT_CHECKOUT_ID = T2.PRODUCT_CHECKOUT_ID
)
;
Result
+---------------------+---------+---------------------------+--------------------+---------------------+-----------------------+
| product_checkout_id | user_id | product_checkout_order_no | checkout_status_id | product_checkout_id | checkout_status_check |
+---------------------+---------+---------------------------+--------------------+---------------------+-----------------------+
| 1 | 1 | ORD123456 | 2 | 1 | Delivered |
+---------------------+---------+---------------------------+--------------------+---------------------+-----------------------+
1 row in set (0.00 sec)

Answer 2

I think your group by mess up your desired outcome. I worked on your given database schema and cretaed a fiddle and managed to get your desired outcome. So your sql should be something like this:
SELECT * FROM tbl_product_checkout as pc
LEFT JOIN tbl_product_checkout_status as cs ON
cs.product_checkout_id = pc.product_checkout_id
WHERE pc.user_id = 1 ORDER BY cs.checkout_status_id DESC limit 1
By using limit 1, you will get last row as we ordered by DESC.
Keep in mind that i removed date part since there was no date on your example code.
Check Out Fiddle