so employers test candidates on various concepts ranging from basic to advanced-level queries. This blog covers common SQL interview questions and their answers to help you succeed in your next interview.
Hello friends, in this SQL hands-on tutorial, you’ll find 50 tricky SQL queries for practice with their answers. Practicing tricky SQL queries is like sharpening your tools for working with data. SQL skills matter because they help you handle and understand information in databases, something t...
Following are some very important Complex SQL Queries Examples with answers. I have tried to explain each and every query in detail so that everyone will get idea of how it is executed step-by-step. In SQL and PL SQL interviews we require to know the key and important complex sql queries...
In conclusion, we covered the top 70+ SQL interview questions and answers in this article that help you prepare and crack SQL jobs. We focused on covering essential concepts of SQL like basics of SQL queries, joins, subqueries, indexing, and performance optimization. Whether you are a beginner...
GROUP BY: Groups rows with similar values. HAVING: Filters grouped rows. LIMIT(or TOP): Limits the number of rows returned. DISTINCT: Retrieves unique values. JOIN: Combines rows from multiple tables. UNION(and UNION ALL): Combines results from multiple queries. ...
Could either database fragmentation or bad queries be causing the counters to reach such heights?A When Pages/sec is greater than 0 or Page Reads/sec is greater than 5, Windows is going to disk to resolve memory references (via a hard page fault), which comes at the price of disk I/...
Note that this does nothing to the thread per se, and this doesn't work against the XML for Analysis (XMLA) SDK. XMLA will attempt to cancel queries in SQL Server 2005 by sending the cancel request to the server, but this is not guaranteed to be an immediate operation....
It uses a filter predicate to improve the performance of queries that retrieve a well-defined subset of rows from the table, by indexing the only portion of the table rows. The smaller size of the Filtered index, that consumes a small amount of the disk space compared with the full-table...
SQL is a complete data manipulation language that is used not only for database queries, but also to modify and update data in the database. Compared to the complexity of the SELECT statement, which supports SQL queries, the SQL statements that modify and create database contents are somewhat...
As possible, we should write saragable queries so that our queries will use the indexes more efficiently. Such as we can look at the following queries, they will fetch some products whose first two names start with ‘BK’ characters. This query will not use the index efficiently, we under...