How to use subquery in SELECT clause? - mysql

Question

I have two table in my database main_item_stock and stock_history
I want to create a report to show that how many stock in, stock out and wastage for each item in main_item_stock, for every action that user do will insert a record into stock_history.
main_item_stock
-----------------------------------------------
stkitm_id stkitm_code stkitm_name stkitm_qty
-----------------------------------------------
1 S001 Apple 10.000
2 S002 Orange 5.000
-----------------------------------------------
stock_history
-------------------------------------------------------------------------------------
stkhis_id sktitm_id stkitm_code stkitm_name stkhis_type stkhis_qty created_date
1 1 S001 Apple Wastage 1.000 2017/03/13
2 2 S002 Orange Stock Out 0.500 2017/03/12
3 2 S002 Orange Stock In 0.100 2017/03/13
-------------------------------------------------------------------------------------
Result that I want:-
----------------------------------------------------------------------------------------------
stkitm_code stkitm_name created_date item_onhand item_stockin item_stockout item_wastage
----------------------------------------------------------------------------------------------
S001 Apple 2017/03/13 9.000 0 0 1
S002 Orange 2017/03/12 4.500 0 0.500 0
S002 Orange 2017/03/13 4.600 0.100 0 0
*item_onhand = main_item_stock.stkitm_qty
I have tried below query but stockin,stockout,wastage always return same value
query = "SELECT main_item_stock.stkitm_code,main_item_stock.stkitm_name,main_item_stock.stkitm_qty,
(SELECT SUM(stkhis_qty) FROM stock_history WHERE stkhis_type = 'Stock Out'"
If dtp_from.Checked Then
query &= " AND DATE(stock_history.created_date) >= '" & Format(CDate(dtp_from.Text), "yyyy-MM-dd") & "'
AND DATE(stock_history.created_date) <= '" & Format(CDate(dtp_to.Text), "yyyy-MM-dd") & "'"
End If
query &= ") AS 'item_stockout',
(SELECT SUM(stkhis_qty) FROM stock_history WHERE stkhis_type = 'Wastage'"
If dtp_from.Checked Then
query &= " AND DATE(stock_history.created_date) >= '" & Format(CDate(dtp_from.Text), "yyyy-MM-dd") & "'
AND DATE(stock_history.created_date) <= '" & Format(CDate(dtp_to.Text), "yyyy-MM-dd") & "'"
End If
query &= ") AS 'item_wastage',
(SELECT SUM(stkhis_qty) FROM stock_history WHERE stkhis_type = 'Stock In'"
If dtp_from.Checked Then
query &= " AND DATE(stock_history.created_date) >= '" & Format(CDate(dtp_from.Text), "yyyy-MM-dd") & "'
AND DATE(stock_history.created_date) <= '" & Format(CDate(dtp_to.Text), "yyyy-MM-dd") & "'"
End If
query &= ") AS 'item_stockin'
FROM main_item_stock
LEFT JOIN stock_history
ON main_item_stock.stkitm_id = stock_history.stkitm_id"
query &= " GROUP BY stock_history.stkitm_id"
How can I change the query and get the result that I want?
UPDATE:
I have tried another query, this time the return data is correct but can I use this table to create the report that I want?
SELECT SUM(stkhis_qty),stkitm_name,stkhis_type,DATE(created_date)
FROM stock_history
WHERE DATE(created_date) >= '2017/03/12'
GROUP BY stkitm_code,stkhis_type,DATE(created_date)
result:-
How can I changed image1 table to image2? The report need to have all these column
UPDATE:
This is main_item_stock
This is stock_history
Result should look like picture below, both type also can.
*the last record date on the picture is wrong should be 3/17/2017

Answer 1

This should get you pretty close...
*edited to reflect the change of items on hand rather than the current total number of items on hand.
SELECT
sh.stkitm_code,
sh.stkitm_name,
SUM(IF(stkhis_type = 'Stock In',
sh.stkhis_qty,
-1 * sh.stkhis_qty)) AS change_of_item_onhand,
SUM(IF(stkhis_type = 'Stock In',
sh.stkhis_qty,
0)) AS item_stockin,
SUM(IF(stkhis_type = 'Stock Out',
sh.stkhis_qty,
0)) AS item_stockout,
SUM(IF(stkhis_type = 'Wastage',
sh.stkhis_qty,
0)) AS item_wastage,
sh.created_date
FROM stock_history sh
LEFT JOIN main_item_stock mis ON mis.stkitm_code = sh.stkitm_code
WHERE sh.created_date > "<Oldest date>"
AND sh.created_date < "<Youngest date>"
GROUP BY stkitm_code
Which should result in output that looks like:
Although you'd probably want to group by the stkitm_code and date.
Alternatively, removing the "SUM"s and "GROUP BY" will itemize it, but the item_onhand column won't be cumulative (there might be a slick way to do that though)
SELECT
sh.stkitm_code,
sh.stkitm_name,
IF(stkhis_type = 'Wastage' OR
stkhis_type = 'Stock Out',
mis.stkitm_qty - sh.stkhis_qty,
mis.stkitm_qty + sh.stkhis_qty) AS item_onhand,
IF(stkhis_type = 'Stock In',
sh.stkhis_qty,
0) AS item_stockin,
IF(stkhis_type = 'Stock Out',
sh.stkhis_qty,
0) AS item_stockout,
IF(stkhis_type = 'Wastage',
sh.stkhis_qty,
0) AS item_wastage,
sh.created_date
FROM stock_history sh
LEFT JOIN main_item_stock mis ON mis.stkitm_code = sh.stkitm_code
WHERE sh.created_date > "<Oldest date>"
AND sh.created_date < "<Youngest date>"
Which will end up looking like this:
Hope this helps!