Finally, we come to the group of database design questions that usually appear in interviews for senior-level data modeling jobs. They deal with advanced topics such as modeling for data warehousing and design techniques for optimizing queries. What are OLTP and OLAP, and how do they affect da...
"In my previous position, I was responsible for developing, testing, and troubleshooting extensive SQL scripts and queries for a new database we created for a customer. I have a specific process I follow when testing to ensure that data is accurate and functional." What types of databases do...
3. Have you know about SQL and queries? If yes, then proceed 1. Define Join and explain different type of joins? Another frequently asked SQL Interview Questions on Joins. In order to avoid data duplication, data is stored in related tables. Join keyword is used to fetch data from related...
It’s best for handling simple queries. The related snowflake schema is also used to represent a multidimensional database. In this pattern, however, dimensions are normalized into lots of separate tables, creating the expansive effect of a snowflake-like structure....
Design optimized SQL queries that are compatible with third-party applications and database development solutions. Design database triggers that can be automated Perform a security check on a custom database Leverage Simulators to Save Time and Costs ...
sets the SQL Server port to 1433. In other words, your database application listens on virtual port 1433. If you run any other application on this port, you run the risk of crashing your database’s listening process, so your database will no longer answer to requests for queries. ...
Sub-queries are often referred to as sub-selects, as they allow a SELECT statement to be executed arbitrarily within the body of another SQL statement. A sub-query is executed by enclosing it in a set of parentheses. Sub-queries are generally used to return a single row as an atomic val...
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Toptal offers top database developers on an hourly, part-time, or full-time contract basis. Clients include Thumbtack, Bridgestone, and Motorola.
NoSQL Database is a sharded (shared-nothing) system which distributes the data uniformly across multiple shards in a cluster. Within each shard, storage nodes are replicated to ensure high availability, rapid failover in the event of a node failure and optimal load balancing of queries. NoSQL...