Learn and practice SQL subqueries with over 70 exercises across 6 datasets. Perfect for beginners and those looking to sharpen their skills. 8.2020 Monthly SQL Practice Sets ★★★(3303)160Coding challengesBasic Practice SQL queries with all coding challenges from 2020! 9.2021 Monthly SQL...
The use of comparison operators like <,> or = can be done in a subquery. These kinds ofSQL Interview Questionsare a bit difficult to understand and answer accordingly. There are a lot ofSQL Interview Questionsapart from this, which the candidates must practice qualifying for the interview. Fo...
Straight to the point with excellent explanation. Questions start you off at beginner level and get more challenging towards the end.I was hoping for more after I reached the end. Her approach gets you started without any nonsense. I highly recommend this book and it should be on every data...
It also provides operations on dates and times and mathematical calculations to allow for the precise management and computation of complex datasets. SQL Aggregate functions: The aggregate functions used in SQL compute a value based on a set of values. Examples of aggregate functions include SUM, ...
Note: obviously, having two datasets with comparable fields is a prerequisite to use the above query Illustrated example Enough with theory, now to practice! Suppose a supermarket wants to retrieve all products eligible for a promotion in a single table according to the week promotion con...
The instructor did a great job simplifying everything and answering our questions. I'm already putting my new SQL skills into practice at work. Mariely De La Cruz I'd absolutely recommend this course to SQL beginners. (A basic understanding of relational databases, even just baseline Excel ...
Regularly review data access patterns to determine which tables or indexes would benefit most from compression, particularly in environments with large datasets and frequent queries. 7.Regular Index Maintenance Fragmented indexes can cause SQL Server to perform extra I/O when retrieving data, leading to...
Work with large datasets containing thousands of entries Understand how to answer complex business problems and questions using insights from data Build a web app using MySQL and NodeJS Practice using real-world challenges Over 320 lectures packed into 20 hours of video content with 141 articles and...
Normalization improves data integrity and consistency, reduces storage requirements, and simplifies maintenance by efficiently handling updates, inserts, and deletions. Advanced SQL Server Interview Questions Now that we've covered intermediate-level concepts let's dive into some advanced SQL Server interview...
Hi! We have a couple very large datasets that need publishing out of one SQL ArcGIS Server database into a 'Publishing' database (20 million records). The data