Sql constraintsa constraint is a rule or limitation that we place on the data in a database that we can put into a column(s). a constraint is part of the table. we can apply constraints when we create ...

Learn how to use views and temporary tables to store and reuse intermediate results in your SQL queries, and improve your code readability, performance, and security. Agree & Join LinkedIn ...

You can modify or drop a check constraint in SQL using the ALTER TABLE statement. To modify a check constraint, you need to drop the existing one and create a new one with the updated condition.

Analyze database contents using basic, intermediate and advanced SQL statement syntax and usage. Demonstrate capability to query data from multiple tables using SQL JOINS. Create and modify database ...

The simple answer is that many applications still call for the kinds of constraints, consistency, and safeguards that SQL databases provide. In those cases, some “advantages” of NoSQL may turn ...

The SQL queries produced in XML-to-SQL query translation are often unnecessarily complex, even for simple input XML queries. In this paper we argue that relational systems can do a better job of ...