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QuestionPivot works, but spread column values not as expected Pin
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QuestionDatabase design for a project Pin
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QuestionHow to get this result in oracle database? Pin
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QuestionSQL SERVER STORE PROCEDURE Pin
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QuestionGiven two dates, count the number of dates in the range that is within month X Pin
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QuestionBest practice for creating a limited access ms-sql user ? Pin
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QuestionMysql How to sort row ORDER BY another query? Pin
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CHill606-Apr-22 2:57
mveCHill606-Apr-22 2:57 
Firstly - take note of the previous comment about SQL Injection!

Quote:
I want the array `$user_tree` to hold (user_id 5) first, then (user_id 6), how to do that?
Then you need to order your results by [user_id] e.g.
SQL
select * 
from @demo
where upline = 2
order by [User_id];
Quote:
I want to print **Left_id** first, then only print **Right_id**. May I know how to do it?
I'm not entirely sure what you mean here, but it sounds like you want the columns in a different order in your result. In the example above I used select * - that is not actually good practice. It is much better to list the columns that you want, in the order that you want them - this helps protect any code that is using the results from any subsequent changes to the table schema, such as adding a new column.

However, if you mean you want to sort by one column within the "grouping" of another column then you simply add a list of things to sort by.

This example covers both the scenarios above
SQL
select Left_id,Right_id
from @demo 
order by Upline, [User_id];
If you meant something else then reply to this solution and I will try to help
QuestionFilter data before lookup(join) two collections in mongodb Pin
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