Sql Query for Logins

sql

sql-injection

query-optimization

index-usage

byAnton Shumikhin·Dec 8, 2024

To quickly retrieve successful logins, start with this neat SQL snippet:

-- Just some nosy SQL looking for successful logins
SELECT username, login_time FROM logins WHERE status = 'Success';

It scans a logins table and hones in on the username and login_time. It shows only success stories - tweak 'Success' to what success means in your system.

MSSQL Server logins: A tale of several queries

Different strokes for different folks, and MSSQL Server is no exception. The paths to the holy grail of login data diverge, and we'll explore the routes.

Compatibility road with system catalog views

In the MSSQL world, master.syslogins is now the granddaddy view, teetering on the brink of extinction. Use caution or consider alternatives:

-- Gather SQL Server logins, but remember: with great data comes great responsibility
SELECT * FROM sys.sql_logins;

This command lists down SQL Server logins in lavish detail like passwords hashes. It's the new hero in town since SQL Server 2005.

For a sweeping, panoramic view of server roles and permissions, persuade this query into action:

-- "As far as the eye can see," they said. So we SELECTed everything
SELECT * FROM sys.server_principals;

This is our champion from SQL Server 2008 and beyond. It spills the tea on all server-level principals.

Stored procedures: The treasure trove

One way to unlock deeper insights into database couplings and paw through permissions is:

-- "X-ray vision mode," aka "I want to see it all"
EXEC sp_helplogins;

This stored procedure is your all-access backstage pass. You even get a nifty @LoginNamePattern filter for that VIP feel.

Azure SQL: The new kid on the block

In Azure SQL, users are its own entities, and master logins can feel left out. Reassure them with:

-- Helping the master feel seen in a crowd of databases
--connect to master/database

Now your queries have a home, whether it's master or any specific Azure SQL databases.

SQL Injection: The villain

When we connect dots into queries, it's vital to guard against SQL injection. If parameterized queries or stored procedures look like an uphill battle, at least remember to validate and sanitize user inputs.

Working magic with historical data

When you're knee-deep in login attempts (even old ones), filter by time range like a pro:

-- Time-traveling query looking for success in the past. If only it worked for lottery numbers...
SELECT username, login_time
FROM logins
WHERE status = 'Success'
AND login_time BETWEEN '2022-01-01T00:00:00Z' AND '2023-01-01T23:59:59Z';

Index usage is your secret sauce here, and query optimization is the cherry on top. Ensure your date columns are indexed and up-to-date statistics for a turbocharged query optimizer.