hierarchical data

External Article

Representing Hierarchical Data for Mere Mortals

  • Article

Why is it that we use XML, but with so little enthusiasm when it does so much, and is so feature-rich? Phil Factor argues that there are better ways of doing it, more complete than JSON, but easier to read than XML. To try to convince you, he gives a set of flying demos, using PowerShell and his PSYaml module, to illustrate how YAML can let you work faster, and more accurately.

2016-12-05

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Question of the Day

The "ORDER BY" clause behavior

Let’s consider the following script that can be executed without any error on both SQL Sever and PostgreSQL. We define the table t1 in which we insert three records:

create table t1 (id int primary key, city varchar(50));

insert into t1 values (1, 'Rome'), (2, 'New York'), (3, NULL);
If we execute the following query, how will the records be sorted in both environments?
select city

from t1

order by city;

See possible answers