I have a stock_item table, which houses all stock that has come and gone through my stock system.
Each stock item can be in one of many states, like: 0 ( not_yet_allocated ), 1 ( allocated ), 3 ( returned )... etc.
I am trying to create a notification system that will let me know when I am running low on stock for a specific stock type.
Here is the SQL I have thus far,
SELECT name, status, count(id) AS count
FROM stock_item
WHERE status IN (0,3) /* Items that are not yet allocated (0), or items that have been returned (3) */
GROUP BY name, status
ORDER BY count ASC;
The above SQL works fine, the only problem is that it does not display a stock type if the WHERE clause is not met, in other words, even though there are no items "in stock" for a certain type, I still need that type to be returned with a count of 0.
You need conditional aggregation to see all the items:
SELECT name, status, sum(case when status IN (0,3) then 1 else 0 end) AS count
FROM stock_item
GROUP BY si.name, si.status
ORDER BY count ASC;
Related
I have 3 table that contain product, product_design and design_type. I'm trying to query out data that have both sold out and in stock product under specific condition where if all stock under design X is 0 then mark as 'OUT_OF_STOCK' otherwise 'IN_STOCK'.
Product Table
Product_design Table
Design_type Table
SELECT a.pid, b.did, a.p_name, a.discount_price, a.original_price, a.p_description, a.p_viewable, c.t_stock, c.t_name,
(CASE WHEN c.t_stock='0' THEN 'OUT_OF_STOCK' ELSE 'IN_STOCK' END) AS stock_status
FROM product a, product_design b, design_type c
WHERE a.pid=b.pid and c.did=b.did and a.p_viewable='Y'
GROUP BY a.pid;
output
Based on the output above, the stock_status of pid=22 should be 'IN_STOCK' because there is design under that pid still have stocks.
All design under pid=22
I'm trying to get the correct stock status.
I think the problem might be that it is checking the first c.t_stock it finds, since there is a t_stock for each instance of that product. Maybe try using the SUM function (sum of c.t_stock). That way if sum = 0, we are sure that all of t_stock are zero.
I am creating a spare part management database in Microsoft Access. I have two table which are ItemTable and EntryTable. ItemTable holds information about each item with unique ItemID and EntryTable holds information of each items usage. I need to calculate the total stock left for each items based on the usage.
So as you can see, for the ItemID with 2, i need to calculate the total stock left based on the usage of In or Out of Status field.
If status is In then plus elseif status is Out then minus. Then total the stock of ItemID 2. Thus the total stock for ItemID 2 will be 3. I have figured out by total and group by for the ItemID but i cannot figure out the way to subtotal based on condition from other column. Thank you.
You can do it with conditional aggregation:
select itemid,
sum(iif(status = 'In', 1, -1) * quantity) as total
from entrytable
group by itemid
I am looking for an efficient alternative to subqueries/joins for this query. Let's say I a table that stores information about companies with the following columns:
name: the name of the company
state: the state the company is located
in
revenue: the annual revenue of the company
employees: how many
employees this company has
active_business: wether or not the company
is in business (1 = yes, 0 = no)
Let's say that from this table, I want to find out how many companies in each state meet the requirement for some minimum amount of revenue, and also how many companies meet the requirement for some minimum number of employees. This can be expressed as the following subquery (can also be written as a a join):
SELECT state,
(
SELECT count(*)
FROM records AS a
WHERE a.state = records.state
AND a.revenue > 1000000
) AS companies_with_min_revenue,
(
SELECT count(*)
FROM records AS a
WHERE a.state = records.state
AND a.employees > 10
) AS companies_with_min_employees
FROM records
WHERE active_business = 1
GROUP BY state
My question is this. Can I do this without the subqueries or joins? Since the query is already iterating over each row (there's no indexes), is there some way I can add a condition that if the row meets the minimum revenue requirements and is in the same state, it will increment some sort of counter for the query (similar to map/reduce)?
I think CASE and SUM will solve it:
SELECT state
, SUM(CASE WHEN R.revenue > 1000000 THEN 1 ELSE 0 END) AS companies_with_min_revenue
, SUM(CASE WHEN R.employees > 10 THEN 1 ELSE 0 END) AS companies_with_min_employees
FROM records R
WHERE R.active_business = 1
GROUP BY R.state
As you can see, we will have a value of 1 per record with a revenue of greater than 1000000 (else 0), then we'll take the sum. The same goes with the other column.
Thanks to this StackOverflow question. You'll find this when you search "sql conditional count" in google.
I have a table Usage and it contains the following columns
sl_No
usage_ID
energyItem_ID
qty
unit_ID
location_ID
p_Rate
Sometimes the same EnergyItem might be located at different locations..
During those conditions how can I get the sum of qty of an individual energyItem..
How to get the sum of the qty of energyItems?
If I've understood correctly, you're trying to find the quantity of each
energy item, regardless of its location, using information in a single table.
The following query will give you the energyItem_ID of each item followed by the total quantity of each item:
SELECT energyItem_ID,Sum(qty) as TotalQuantity
FROM Usage
GROUP BY energyItem_ID
ORDER BY energyItem_ID
If, on the other hand, you wanted the quantity of each energy item, broken down by location, you would need the following:
SELECT location_ID,energyItemID,Sum(qty) as QuantityByLocation
FROM Usage
GROUP BY location_ID,energyItemID
ORDER BY location_ID,energyItemID
The order by clauses make the result easier to follow, but are not strictly necessary.
Finally, the answer by marc_s will give you the quantity of a specific energyItem.
How about:
SELECT EnergyItem_ID, SUM(qty)
FROM dbo.Usage
WHERE EnergyItem_ID = 42 -- or whatever ....
GROUP BY EnergyItem_ID
Or what are you looking for?? The question isn't very clear on the expected output....
select a.usage_ID , b.sum(p_Rate) as total from Table_1 a
inner join Table_2 as b on a.usage_ID = b.usage_ID
group by a.usage_ID
I can tell it best by explaining the query I have, and what I need.
I need to be able to get a group of items from the database, grouped by category, manufacturer, and year made. The groupings need to be sorted based on total amount of items within the group. This part is done with the query below.
Secondly, I need to be able to show an image of the most expensive item out of the group, which is why I use MAX(items.current_price). I thought MAX() gets the ENTIRE row corresponding to the largest column value. I was wrong, as MAX only gets the numeric value of the largest price. So the query doesnt work well for that.
SELECT
items.id,
items.year,
items.manufacturer,
COUNT(items.id) AS total,
MAX(items.current_price) AS price,
items.gallery_url,
FROM
ebay AS items
WHERE
items.primary_category_id = 213
AND
items.year <> ''
AND
items.manufacturer <> ''
AND
items.bad_item <> 1
GROUP BY
items.primary_category_id,
items.manufacturer,
items.year
ORDER BY
total DESC,
price ASC
LIMIT
10
if that doesnt explain it well, the results should be something like this
id 10548
year 1989
manufacturer bowman
total 451
price 8500.00 (The price of the most expensive item in the table/ not the price of item 10548)
gallery_url http://ebay.xxxxx (The image of item 10548)
A little help please. Thanks
I've had this same problem, and I'm fairly certain you have to do two queries (or a subquery, that's a matter of taste).
The first query is like what you have (except id isn't helping you).
The second query uses the GROUP BY fields and one (one!) MAX field to get the id and any other meta-data you need.
I believe this is the implementation, although it's hard to test:
SELECT
items.id,
items.year,
items.manufacturer,
items.gallery_url
FROM
ebay as items
NATURAL JOIN
(
SELECT
COUNT(items.id) AS total,
MAX(items.current_price) AS current_price,
items.primary_category_id,
items.manufacturer,
items.year
FROM
ebay AS items
WHERE
items.primary_category_id = 213
AND
items.year <> ''
AND
items.manufacturer <> ''
AND
items.bad_item <> 1
GROUP BY
items.primary_category_id,
items.manufacturer,
items.year
ORDER BY
total DESC,
price ASC
LIMIT
10
) as bigones
ORDER BY
bigones.total DESC,
bigones.current_price ASC
This documentation may help you understand what's going on:
http://dev.mysql.com/doc/refman/5.1/en/group-by-hidden-columns.html
... all rows in each group should have the same values for the columns that are ommitted from the GROUP BY part. The server is free to return any value from the group, so the results are indeterminate unless all values are the same.