MYSQL Query with Multiple Selects from Same Table - mysql

Question

Getting an error
Operand should contain 1 column(s)
PK is ID
The table just dumps data in to the table
need to get the earliest date qty and the latest date qty and display on the same column
Any help appreciated
SELECT ebx_r_history.ItemNumber,
(SELECT r.QuantitySold as newqty, r.lastupdate as lu
FROM ebx_r_history r
WHERE ebx_r_history.ItemNumber = r.ItemNumber AND ebx_r_history.SKU = r.SKU
ORDER BY r.LastUpdate ASC
LIMIT 1),
(SELECT r.QuantitySold as newqty, r.lastupdate as lu
FROM ebx_r_history r
WHERE ebx_r_history.ItemNumber = r.ItemNumber AND ebx_r_history.SKU = r.SKU
ORDER BY r.LastUpdate DESC
LIMIT 1)
FROM
ebx_r_history
GROUP BY ebx_r_history.ItemNumber,
ebx_r_history.SKU
ORDER BY ebx_r_history.LastUpdate

Answer 1

This version may offer a simplified and faster alternative for you. The inner query for "AllItems" does both a min and max of the last update on a per-item number/sku basis, although I believe they would be one-in-the-same record.
So now, join that results back to the history data by item/sku and only those that match either the min or max date. If a true date/time, there would expect to only be one anyhow, vs just a date-only. So, since there would be 2 possible records (one for the min, one for the max), I am applying a MAX( IIF( )) for each respective matching the minimum and maximum dates respectively and must retain the group by clause.
Note, if you are dealing with date-only entries, or possibilities of the exact same item/sku and lastupdate are the same to the second, then you would need an approach more towards limit 1 per ascending/descending basis.
SELECT
AllItems.ItemNumber,
AllItems.SKU,
AllItems.MinUpdate,
MAX( IIF( rh.lastupdate = AllItems.MinUpdate, rh.Quantity.Sold, 0 )) as QtyAtMinDate,
AllItems.MaxUpdate,
MAX( IIF( rh.lastupdate = AllItems.MaxUpdate, rh.Quantity.Sold, 0 )) as QtyAtMaxDate
from
( SELECT
r.ItemNumber,
r.SKU,
MIN( r.lastupdate ) as MinUpdate,
MAX( r.lastupdate ) as MaxUpdate
FROM
ebx_r_history r
group by
r.ItemNumber,
r.SKU ) AllItems
JOIN ebx_r_history rh
ON AllItems.ItemNumber = rh.ItemNumber
AND AllItems.SKU = rh.SKU
AND ( rh.lastUpdate = AllItems.MinUpdate
OR rh.lastUpdate = AllItems.MaxUpdate )
group by
AllItems.ItemNumber,
AllItems.SKU
Per another answer where you were only looking to IGNORE items within the most recent 14 days, you can just add a WHERE clause to the inner query similar via
WHERE r.LastUpdate >= CURDATE() - INTERVAL 14 DAY
If your history table has an auto-incrementing ID column, AND the respective transactions have the lastUpdate sequentially stamped, such as when they are added and not modified by any other operation, then you could just apply similar but MIN/MAX of the ID column, then join back TWICE on the ID and just each row ONCE such as...
SELECT
AllItems.ItemNumber,
AllItems.SKU,
rhMin.LastUpdate as MinUpdate,
rhMin.QuantitySold as MinSold,
rhMax.LastUpdate as MaxUpdate,
rhMax.QuantitySold as MaxSold
from
( SELECT
r.ItemNumber,
r.SKU,
MIN( r.AutoIncrementColumn ) as MinAutoID,
MAX( r.AutoIncrementColumn ) as MaxAutoID
FROM
ebx_r_history r
group by
r.ItemNumber,
r.SKU ) AllItems
JOIN ebx_r_history rhMin
ON AllItems.MinAutoID = rhMin.AutoIncrementColumn
JOIN ebx_r_history rhMax
ON AllItems.MaxAutoID = rhMax.AutoIncrementColumn
order by
rhMax.LastUpdated

Answer 2

Try something like this:
SELECT r1.ItemNumber,
(
SELECT r.QuantitySold
FROM ebx_r_history r
WHERE r1.ItemNumber = r.ItemNumber
AND r1.SKU = r.SKU
ORDER BY r.LastUpdate ASC LIMIT 1
) AS earliestDateQty,
(
SELECT r.QuantitySold
FROM ebx_r_history r
WHERE r1.ItemNumber = r.ItemNumber
AND r1.SKU = r.SKU
ORDER BY r.LastUpdate DESC LIMIT 1
) AS latestDateQty
FROM ebx_r_history r1
GROUP BY r1.ItemNumber,r1.SKU
ORDER BY 3
You had a couple of errors. you were getting two columns inside the inner selects, and you had a couple of places where you might get the error for ambiguous column name.

Answer 3

sqlFiddle here
SELECT T1.ItemNumber,
T1.SKU,
T1.Old_QuantitySold,
T1.Old_LastUpdate,
T2.New_QuantitySold,
T2.New_LastUpdate
FROM
(SELECT itemNumber,SKU,QuantitySold as Old_QuantitySold,LastUpdate as Old_LastUpdate
FROM ebx_r_history r
WHERE NOT EXISTS (SELECT 1 FROM ebx_r_history e
WHERE e.itemNumber = r.itemNumber AND e.SKU = r.SKU
AND e.LastUpdate < r.LastUpdate)
)T1
LEFT JOIN
(SELECT itemNumber,SKU,QuantitySold as New_QuantitySold,LastUpdate as New_LastUpdate
FROM ebx_r_history r
WHERE NOT EXISTS (SELECT 1 FROM ebx_r_history e
WHERE e.itemNumber = r.itemNumber AND e.SKU = r.SKU
AND e.LastUpdate > r.LastUpdate)
)T2 ON (T2.itemNumber = T1.itemNumber AND T2.SKU = T1.SKU)
WHERE T1.Old_LastUpdate >= CURDATE() - INTERVAL 14 DAY
AND T2.New_LastUpdate >= CURDATE() - INTERVAL 14 DAY
ORDER BY T2.New_LastUpdate;
you can do left join or inner join it's up to you, since T1 will always get earliest records and T2 will always get latest records for the ItemNumber,SKU grouping.
UPDATED TO IGNORE DATA OLDER THAN 14 DAYS
SELECT T1.ItemNumber,
T1.SKU,
T1.Old_QuantitySold,
T1.Old_LastUpdate,
T2.New_QuantitySold,
T2.New_LastUpdate
FROM
(SELECT itemNumber,SKU,QuantitySold as Old_QuantitySold,LastUpdate as Old_LastUpdate
FROM ebx_r_history r
WHERE LastUpdate >= CURDATE() - INTERVAL 14 DAY
AND NOT EXISTS (SELECT 1 FROM ebx_r_history e
WHERE e.itemNumber = r.itemNumber AND e.SKU = r.SKU
AND e.LastUpdate >= CURDATE() - INTERVAL 14 DAY
AND e.LastUpdate < r.LastUpdate)
)T1
LEFT JOIN
(SELECT itemNumber,SKU,QuantitySold as New_QuantitySold,LastUpdate as New_LastUpdate
FROM ebx_r_history r
WHERE LastUpdate >= CURDATE() - INTERVAL 14 DAY
AND NOT EXISTS (SELECT 1 FROM ebx_r_history e
WHERE e.itemNumber = r.itemNumber AND e.SKU = r.SKU
AND e.LastUpdate >= CURDATE() - INTERVAL 14 DAY
AND e.LastUpdate > r.LastUpdate)
)T2 ON (T2.itemNumber = T1.itemNumber AND T2.SKU = T1.SKU)
ORDER BY T2.New_LastUpdate;
ignore data older than 14 days sqlFiddle here
If you want to use exact time (14 days ago), you can replace occurences of CURDATE() with NOW()