It would have been easy to create a set of practice problems that just illustrate the main keywords in SQL. Easy, but not useful. Much more difficult to create, andmuchmore valuable, are practice problems that coverthe most common issuesthat you’ll encounter in your work with data. You c...
This resource offers a total of 145 SQL JOINS problems for practice. It includes 29 main exercises, each accompanied by solutions, detailed explanations, and four related problems. You may read ourSQL Joins,SQL Left Join,SQL Right Join, tutorial before solving the following exercises. 1. Sales ...
Last update on March 13 2025 12:53:29 (UTC/GMT +8 hours) This resource offers a total of 2605 SQL problems for practice. It includes 1246 main exercises, each accompanied by solutions, detailed explanations, and four/five related problems. ...
Practice with "Real" SQL Problems. Contribute to XD-DENG/SQL-exercise development by creating an account on GitHub.
Ownership and permission problems on the backup device's physical file can interfere with a backup operation. Ensure SQL Server startup account needs to have read and write permissions to the backup device and the folder where the backup files are written to. However, sp_addumpdevice, which ad...
This function produces ranges of GUIDs, which can help to alleviate some of the problems I'll describe here. But it requires generating a server-side GUID, which doesn't work in many application environments because the unique identifier must be generated before the data is sent down to the...
Filtering input might also be helpful in protecting against SQL injection by removing escape characters. However, because of the large number of characters that might pose problems, filtering isn't a reliable defense. The following example searches for the character string delimiter. ...
SQL Server provides a dedicated administrator connection (DAC). The DAC allows an administrator to access a running instance of SQL Server Database Engine to troubleshoot problems on the server-even when the server is unresponsive to other client connections. The DAC is available through...
However, settingmax server memory (MB)too low is a lost performance opportunity, and could cause memory pressure and performance problems in the SQL Server instance. Settingmax server memory (MB)to the minimum value can even prevent SQL Server from starting. If you can't start SQL Se...
Ownership and permission problems on the backup device's physical file can interfere with a backup operation. Ensure SQL Server startup account needs to have read and write permissions to the backup device and the folder where the backup files are written to. However, sp_addumpdevice, which ad...