Sorting Table in hierarchical order - sql-server

Question

Is it possible to sorting queries table in hierarchical order like this:
Expected
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| ID | Code | Name | Qty | Amount | is_parent | parent_id | remarks |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 1 | ABC | Parent1 | 2 | 1,000 | 1 | 0 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 4 | FFLK | Product Z | 10 | 2,500 | 0 | 1 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 5 | P6DT | Product 5 | 7 | 1,700 | 0 | 1 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 6 | P2GL | Product T | 5 | 1,100 | 0 | 1 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 2 | DHG | Parent2 | 5 | 1,500 | 1 | 0 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 3 | LMSJ | Product U | 4 | 600 | 0 | 2 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
This is the original data table:
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| ID | Code | Name | Qty | Amount | is_parent | parent_id | remarks |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 1 | ABC | Parent1 | 2 | 1,000 | 1 | 0 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 2 | DHG | Parent2 | 5 | 1,500 | 1 | 0 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 3 | LMSJ | Product U | 4 | 600 | 0 | 2 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 4 | FFLK | Product Z | 10 | 2,500 | 0 | 1 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 5 | P6DT | Product 5 | 7 | 1,700 | 0 | 1 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
| 6 | P2GL | Product T | 5 | 1,100 | 0 | 1 | xxx |
+----+--------+-----------+-------+--------+-----------+-----------+---------+
is_parent column = 1 if data row set to parent, 0 if data row set to child
parent_id column = 0 if data row set to parent, depend on ID of parent data
I'm using SQL Server to generate the data.

Answer 1

It looks like the actual question is how to query the data in hierarchical order. This is possible using recursive queries but a faster alternative is to use SQL Server's support for hierarchical data.
A recursive query that returns the data in hierarchical order would look like this :
WITH h AS
(
SELECT
ID,Code,Name,Qty,Amount,is_parent,parent_id,remarks
FROM
dbo.ThatTable
WHERE
parent_id=0
UNION ALL
SELECT
c.ID,c.Code,c.Name,c.Qty,c.Amount,c.is_parent,c.parent_id,c.remarks
FROM
dbo.ThatTable c
INNER JOIN h ON
c.parent_id= h.Id
)
SELECT * FROM h
This query's performance will be acceptable if the ID and Parent_ID fields are indexed, but not great.
Adding a hierarchyid field to the table would make the query simpler and far faster. Assuming there's a hierarchy field, the query would be just :
SELECT *
FROM ThatTable
ORDER BY hierarchy
Adding an index on hierarchy will this query and any query that looks eg for children of a specific node, very fast. Instead of querying recursively, the server only needs to look into that single index.
The article Lesson 1: Converting a Table to a Hierarchical Structure shows how to create a new table with a hierarchyid and populate it from parent/child data.