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Validating different types of data like Gmail, Outlook email addresses, phone numbers, and URLs

Validating different types of data like Gmail, Outlook email addresses, phone numbers, and URLs in SQL can be a bit challenging since SQL is primarily used for data manipulation in databases and not for complex data validation. However, depending on the database system you are using, there might be some limited string manipulation functions available that can help you perform basic validation checks.

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2023-07-28

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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;

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