Sql-server – List parent then nested child items in a single table

sql servert-sql

With the following SCHEMA

CREATE TABLE Software (
    ID INT,
    name VARCHAR(150),
    ParentID INT );

INSERT INTO Software VALUES (1,'Main Product',NULL); 
INSERT INTO Software VALUES (2,'Next Main Product',NULL); 
INSERT INTO Software VALUES (3,'Addon Product',1); 
INSERT INTO Software VALUES (4,'Addon Product',1); 
INSERT INTO Software VALUES (5,'Sub-Addon Product',3);

I need to create a query that will sort the data by picking the first Main Product, then finding any addon products where the parent ID matches the ID of the parent, then seeing if that addon-product has any sub-addon products.

The Query I've tried based on one of the recommendations is

WITH x AS (
    SELECT ID
    FROM Software
    WHERE ParentID IS NULL)
SELECT 
    Software.ID,
    Software.name
FROM Software
INNER JOIN x ON x.ID=Software.ParentID OR x.ID = Software.ID

The output however misses the sub-addon product shown below:

/---------------------
| ID  | Name
| 1   | Main Product
| 3   |   Addon Product
| 4   |   Addon Product
| 2   | Main Product
\----------------------

What I need is this where the sub-addon is added

/---------------------
| ID  | Name
| 1   | Main Product
| 3   |   Addon Product
| 5   |     Sub-Addon Product
| 4   |   Addon Product
| 2   | Next Main Product
\----------------------

Best Answer

As far as you want to obtain all records where parent_id is null, I'd suggest to use an inline udf function.

-- Inline UDF function
CREATE FUNCTION fnTree(@ID int)
RETURNS table AS
RETURN
(
    WITH tree AS
    (
      SELECT c1.id, c1.parent_id, c1.name, [level] = 1, path = cast(c1.id as varchar(100))
      FROM dbo.[software] c1
      WHERE c1.id = @ID
      UNION ALL
      SELECT c2.id, c2.parent_id, c2.name, [level] = tree.[level] + 1, Path=Cast(tree.path+'/'+cast(c2.id as varchar(10)) as varchar(100))
      FROM dbo.[software] c2 INNER JOIN tree ON tree.id = c2.parent_id
    )
    SELECT tree.path, tree.id, parent_id, REPLICATE('  ', tree.level - 1) + tree.name as name
    FROM tree
);
GO

Then you can CROSS APPLY this function with all records where parent_id is null Take care when using a recursive function, you should set OPTION (MAXRECURSION XXX) just to ensure it can hold all returned records.

SELECT      f.id, f.name, f.parent_id, f.path
FROM        software
CROSS APPLY fnTree(software.id) f
WHERE       software.parent_id IS NULL
ORDER BY    f.path
OPTION (MAXRECURSION 0);
GO

id | name                  | parent_id | path 
-: | :-------------------- | --------: | :----
 1 | Main Product          |      null | 1    
 3 |   Addon Product       |         1 | 1/3  
 5 |     Sub-Addon Product |         3 | 1/3/5
 4 |   Addon Product       |         1 | 1/4  
 2 | Next Main Product     |      null | 2

dbfiddle here

Related Solutions

Sql-server – Parent-Child Tree Hierarchical ORDER

OK, enough brain cells are dead.

SQL Fiddle

WITH cte AS
(
  SELECT 
    [ICFilterID], 
    [ParentID],
    [FilterDesc],
    [Active],
    CAST(0 AS varbinary(max)) AS Level
  FROM [dbo].[ICFilters]
  WHERE [ParentID] = 0
  UNION ALL
  SELECT 
    i.[ICFilterID], 
    i.[ParentID],
    i.[FilterDesc],
    i.[Active],  
    Level + CAST(i.[ICFilterID] AS varbinary(max)) AS Level
  FROM [dbo].[ICFilters] i
  INNER JOIN cte c
    ON c.[ICFilterID] = i.[ParentID]
)

SELECT 
  [ICFilterID], 
  [ParentID],
  [FilterDesc],
  [Active]
FROM cte
ORDER BY [Level];

Sql-server – Retrieving n rows per group

Let's start with the basic scenario.

If I want to get some number of rows out of a table, I have two main options: ranking functions; or TOP.

First, let's consider the whole set from Production.TransactionHistory for a particular ProductID:

SELECT h.TransactionID, h.ProductID, h.TransactionDate
FROM Production.TransactionHistory h
WHERE h.ProductID = 800;

This returns 418 rows, and the plan shows that it checks every row in the table looking for this - an unrestricted Clustered Index Scan, with a Predicate to provide the filter. 797 reads here, which is ugly.

Expensive Scan with 'Residual' Predicate

So let's be fair to it, and create an index that would be more useful. Our conditions call for an equality match on ProductID, followed by a search for the most recent by TransactionDate. We need the TransactionID returned too, so let's go with: CREATE INDEX ix_FindingMostRecent ON Production.TransactionHistory (ProductID, TransactionDate) INCLUDE (TransactionID);.

Having done this, our plan changes significantly, and drops the reads down to just 3. So we're already improving things by over 250x or so...

Improved plan

Now that we've levelled the playing field, let's look at the top options - ranking functions and TOP.

WITH Numbered AS
(
SELECT h.TransactionID, h.ProductID, h.TransactionDate, ROW_NUMBER() OVER (ORDER BY TransactionDate DESC) AS RowNum
FROM Production.TransactionHistory h
WHERE h.ProductID = 800
)
SELECT TransactionID, ProductID, TransactionDate
FROM Numbered
WHERE RowNum <= 5;

SELECT TOP (5) h.TransactionID, h.ProductID, h.TransactionDate
FROM Production.TransactionHistory h
WHERE h.ProductID = 800
ORDER BY TransactionDate DESC;

$Two plans - basic TOP\RowNum$

You will notice that the second (TOP) query is much simpler than the first, both in query and in plan. But very significantly, they both use TOP to limit the number of rows actually being pulled out of the index. The costs are only estimates and worth ignoring, but you can see a lot of similarity in the two plans, with the ROW_NUMBER() version doing a tiny amount of extra work to assign numbers and filter accordingly, and both queries end up doing just 2 reads to do their work. The Query Optimizer certainly recognises the idea of filtering on a ROW_NUMBER() field, realising that it can use a Top operator to ignore rows that aren't going to be needed. Both these queries are good enough - TOP isn't so much better that it's worth changing code, but it is simpler and probably clearer for beginners.

So this work across a single product. But we need to consider what happens if we need to do this across multiple products.

The iterative programmer is going to consider the idea of looping through the products of interest, and calling this query multiple times, and we can actually get away with writing a query in this form - not using cursors, but using APPLY. I'm using OUTER APPLY, figuring that we might want to return the Product with NULL, if there are no Transactions for it.

SELECT p.Name, p.ProductID, t.TransactionID, t.TransactionDate
FROM 
Production.Product p
OUTER APPLY (
    SELECT TOP (5) h.TransactionID, h.ProductID, h.TransactionDate
    FROM Production.TransactionHistory h
    WHERE h.ProductID = p.ProductID
    ORDER BY TransactionDate DESC
) t
WHERE p.Name >= 'M' AND p.Name < 'S';

The plan for this is the iterative programmers' method - Nested Loop, doing a Top operation and Seek (those 2 reads we had before) for each Product. This gives 4 reads against Product, and 360 against TransactionHistory.

APPLY plan

Using ROW_NUMBER(), the method is to use PARTITION BY in the OVER clause, so that we restart the numbering for each Product. This can then be filtered like before. The plan ends up being quite different. The logical reads are about 15% lower on TransactionHistory, with a full Index Scan going on to get the rows out.

WITH Numbered AS
(
SELECT p.Name, p.ProductID, h.TransactionID, h.TransactionDate, ROW_NUMBER() OVER (PARTITION BY h.ProductID ORDER BY h.TransactionDate DESC) AS RowNum
FROM Production.Product p
LEFT JOIN Production.TransactionHistory h ON h.ProductID = p.ProductID
WHERE p.Name >= 'M' AND p.Name < 'S'
)
SELECT Name, ProductID, TransactionID, TransactionDate
FROM Numbered n
WHERE RowNum <= 5;

ROW_NUMBER plan

Significantly, though, this plan has an expensive Sort operator. The Merge Join doesn't seem to maintain the order of rows in TransactionHistory, the data must be resorted to be able to find the rownumbers. It's fewer reads, but this blocking Sort could feel painful. Using APPLY, the Nested Loop will return the first rows very quickly, after just a few reads, but with a Sort, ROW_NUMBER() will only return rows after a most of the work has been finished.

Interestingly, if the ROW_NUMBER() query uses INNER JOIN instead of LEFT JOIN, then a different plan comes up.

ROW_NUMBER() with INNER JOIN

This plan uses a Nested Loop, just like with APPLY. But there's no Top operator, so it pulls all the transactions for each product, and uses a lot more reads than before - 492 reads against TransactionHistory. There isn't a good reason for it not to choose the Merge Join option here, so I guess the plan was considered 'Good Enough'. Still - it doesn't block, which is nice - just not as nice as APPLY.

The PARTITION BY column that I used for ROW_NUMBER() was h.ProductID in both cases, because I had wanted to give the QO the option of producing the RowNum value before joining to the Product table. If I use p.ProductID, we see the same shape plan as with the INNER JOIN variation.

WITH Numbered AS
(
SELECT p.Name, p.ProductID, h.TransactionID, h.TransactionDate, ROW_NUMBER() OVER (PARTITION BY p.ProductID ORDER BY h.TransactionDate DESC) AS RowNum
FROM Production.Product p
LEFT JOIN Production.TransactionHistory h ON h.ProductID = p.ProductID
WHERE p.Name >= 'M' AND p.Name < 'S'
)
SELECT Name, ProductID, TransactionID, TransactionDate
FROM Numbered n
WHERE RowNum <= 5;

But the Join operator says 'Left Outer Join' instead of 'Inner Join'. The number of reads is still just under 500 reads against the TransactionHistory table.

PARTITION BY on p.ProductID instead of h.ProductID

Anyway - back to the question at hand...

We've answered question 1, with two options that you could pick and choose from. Personally, I like the APPLY option.

To extend this to use a variable number (question 2), the 5 just needs to be changed accordingly. Oh, and I added another index, so that there was an index on Production.Product.Name that included the DaysToManufacture column.

WITH Numbered AS
(
SELECT p.Name, p.ProductID, p.DaysToManufacture, h.TransactionID, h.TransactionDate, ROW_NUMBER() OVER (PARTITION BY h.ProductID ORDER BY h.TransactionDate DESC) AS RowNum
FROM Production.Product p
LEFT JOIN Production.TransactionHistory h ON h.ProductID = p.ProductID
WHERE p.Name >= 'M' AND p.Name < 'S'
)
SELECT Name, ProductID, TransactionID, TransactionDate
FROM Numbered n
WHERE RowNum <= 5 * DaysToManufacture;

SELECT p.Name, p.ProductID, t.TransactionID, t.TransactionDate
FROM 
Production.Product p
OUTER APPLY (
    SELECT TOP (5 * p.DaysToManufacture) h.TransactionID, h.ProductID, h.TransactionDate
    FROM Production.TransactionHistory h
    WHERE h.ProductID = p.ProductID
    ORDER BY TransactionDate DESC
) t
WHERE p.Name >= 'M' AND p.Name < 'S';

And both plans are almost identical to what they were before!

Variable rows

Again, ignore the estimated costs - but I still like the TOP scenario, as it is so much more simple, and the plan has no blocking operator. The reads are less on TransactionHistory because of the high number of zeroes in DaysToManufacture, but in real life, I doubt we'd be picking that column. ;)

One way to avoid the block is to come up with a plan that handles the ROW_NUMBER() bit to the right (in the plan) of the join. We can persuade this to happen by doing the join outside the CTE.

WITH Numbered AS
(
SELECT h.TransactionID, h.ProductID, h.TransactionDate, ROW_NUMBER() OVER (PARTITION BY ProductID ORDER BY TransactionDate DESC) AS RowNum
FROM Production.TransactionHistory h
)
SELECT p.Name, p.ProductID, t.TransactionID, t.TransactionDate
FROM Production.Product p
LEFT JOIN Numbered t ON t.ProductID = p.ProductID
    AND t.RowNum <= 5 * p.DaysToManufacture
WHERE p.Name >= 'M' AND p.Name < 'S';

The plan here looks simpler - it's not blocking, but there's a hidden danger.

Joining outside CTE

Notice the Compute Scalar that's pulling data from the Product table. This is working out the 5 * p.DaysToManufacture value. This value isn't being passed into the branch that's pulling data from the TransactionHistory table, it's being used in the Merge Join. As a Residual.

Sneaky Residual!

So the Merge Join is consuming ALL the rows, not just the first however-many-are-needed, but all of them and then doing a residual check. This is dangerous as the number of transactions increases. I'm not a fan of this scenario - residual predicates in Merge Joins can quickly escalate. Another reason why I prefer the APPLY/TOP scenario.

In the special case where it's exactly one row, for question 3, we can obviously use the same queries, but with 1 instead of 5. But then we have an extra option, which is to use regular aggregates.

SELECT ProductID, MAX(TransactionDate)
FROM Production.TransactionHistory
GROUP BY ProductID;

A query like this would be a useful start, and we could easily modify it to pull out the TransactionID as well for tie-break purposes (using a concatenation which would then be broken down), but we either look at the whole index, or we dive in product by product, and we don't really get a big improvement on what we had before in this scenario.

But I should point out that we're looking at a particular scenario here. With real data, and with an indexing strategy that may not be ideal, mileage may vary considerably. Despite the fact that we've seen that APPLY is strong here, it can be slower in some situations. It rarely blocks though, as it has a tendency to use Nested Loops, which many people (myself included) find very appealing.

I haven't tried to explore parallelism here, or dived very hard into question 3, which I see as a special case that people rarely want based on the complication of concatenating and splitting. The main thing to consider here is that these two options are both very strong.

I prefer APPLY. It's clear, it uses the Top operator well, and it rarely causes blocking.

Best Answer

Related Solutions

Sql-server – Parent-Child Tree Hierarchical ORDER

Sql-server – Retrieving n rows per group

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