The CASE statement in SQL allows you to implement conditional logic within queries, making it a powerful tool for handling complex data transformations and classifications.
CASE
The CASE statement works like an IF-ELSE structure, evaluating conditions and returning corresponding values:
IF-ELSE
SELECT column_name, CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ELSE default_result END AS alias_name FROM table_name;
Assume we have an Employees table with an Age column, and we want to categorize employees based on their age groups:
Employees
Age
SELECT Name, Age, CASE WHEN Age < 25 THEN 'Young' WHEN Age BETWEEN 25 AND 40 THEN 'Mid-Age' ELSE 'Senior' END AS AgeCategory FROM Employees;
CASE is often used in aggregate functions to perform conditional counting or summing:
SELECT SUM(CASE WHEN Age < 25 THEN 1 ELSE 0 END) AS YoungCount, SUM(CASE WHEN Age BETWEEN 25 AND 40 THEN 1 ELSE 0 END) AS MidAgeCount, SUM(CASE WHEN Age > 40 THEN 1 ELSE 0 END) AS SeniorCount FROM Employees;
You can use CASE to customize sorting order dynamically:
SELECT Name, Age FROM Employees ORDER BY CASE WHEN Age < 25 THEN 1 WHEN Age BETWEEN 25 AND 40 THEN 2 ELSE 3 END;
The CASE statement is a versatile tool in SQL for implementing conditional logic in SELECT, WHERE, ORDER BY, and aggregate functions. It enhances query flexibility, making data classification and transformation more efficient.
SELECT
WHERE
ORDER BY
Storing passwords as plain text is dangerous. Instead, you should hash them using a strong, slow hashing algorithm like BCrypt, which includes built-in salting and resistance to brute-force attacks.
Step 1: Install BCrypt NuGet Package
Before using BCrypt, install the BCrypt.Net-Next package:
dotnet add package BCrypt.Net-Next
or via NuGet Package Manager:
Install-Package BCrypt.Net-Next
Step 2: Hash a Password
Use BCrypt.HashPassword() to securely hash a password before storing it:
using BCrypt.Net; string password = "mySecurePassword123"; string hashedPassword = BCrypt.HashPassword(password); Console.WriteLine(hashedPassword); // Output: $2a$12$...
Step 3: Verify a Password
To check a user's login attempt, use BCrypt.Verify():
bool isMatch = BCrypt.Verify("mySecurePassword123", hashedPassword); Console.WriteLine(isMatch); // Output: True
Ensuring proper hashing should be at the top of your list when it comes to building authentication systems.
String interpolation, introduced in C# 6.0, provides a more readable and concise way to format strings compared to traditional concatenation (+) or string.Format(). Instead of manually inserting variables or placeholders, you can use the $ symbol before a string to directly embed expressions inside brackets.
string name = "Walt"; string job = 'Software Engineer'; string message = $"Hello, my name is {name} and I am a {job}"; Console.WriteLine(message);
This would produce the final output of:
Hello, my name is Walt and I am a Software Engineer
String interpolation can also be chained together into a multiline string (@) for even cleaner more concise results:
string name = "Walt"; string html = $@" <div> <h1>Welcome, {name}!</h1> </div>";
In C#, you can format an integer with commas (thousands separator) using ToString with a format specifier.
int number = 1234567; string formattedNumber = number.ToString("N0"); // "1,234,567" Console.WriteLine(formattedNumber);
Explanation:
"N0": The "N" format specifier stands for Number, and "0" means no decimal places. The output depends on the culture settings, so in regions where , is the decimal separator, you might get 1.234.567.
Alternative:
You can also specify culture explicitly if you need a specific format:
using System.Globalization; int number = 1234567; string formattedNumber = number.ToString("N0", CultureInfo.InvariantCulture); Console.WriteLine(formattedNumber); // "1,234,567"
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