Sorted:

How do you handle NULL values in SQL Server?

How to conduct cross-database querying in SQL Server?

How to perform bulk insert operations in SQL Server?

How to find duplicate records in SQL Server?

What are temporary tables in SQL Server?

How can you use transaction control in SQL Server?

How to execute cross-database queries in PostgreSQL?

How are JSON and XML data types handled in PostgreSQL?

How are date and time data handled in PostgreSQL?

How to execute a stored procedure in SQLServer?