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Dynamic SQL enables the construction ofSQL queries at runtime, allowing flexibility in query execution. It is commonly used forsearch filters, report generation, and metadata-driven applications. Implementation Methods: Using EXECUTE: DECLARE @sqlQuery NVARCHAR(MAX) = 'SELECT * FROM Employees WHERE D...
A query, in SQL, is a command used to request data or update information from a database table or combination of tables. Users can write and execute queries to retrieve, delete or update information in a database. Usually, a query response returns data from different tables within the data...
If you want to understand the foundational concepts of the Oracle database, I recommend taking ourIntroduction to Oracle SQLcourse, which is a really important resource to learn how to interact with the Oracle database and how the database uses PL/SQL to process queries. Beginner PL/SQL Inte...
SQL Interview Question #2 You work for a startup that makes an online presentation software. You have an event log that records every time a user inserted an image into a presentation. (One user can insert multiple images.) The event_log SQL table looks like this: user_id event_date_tim...
Joins are used in queries to explain how different tables are related. Joins also let you select data from a table depending upon data from another table. Types of joins: INNER JOINs, OUTER JOINs, CROSS JOINs.OUTER JOINs are further classified as LEFT OUTER JOINS, RIGHT OUTER JOINS and FULL...
We can check the current settings and thread allocation using the below queries. –Thread setting select max_workers_count from sys.dm_os_sys_info –Active threads select count(*) from sys.dm_os_threads Default value is 255. Increasing the number of worker threads may actually decrease the ...
What You'll Learn in This Free Interview Preparation Ebook Q&A 24 Guides Q&A Guides Module 1. SQL Server Q&A: Introduction and Database Basics Lessons (2) Introduction to SQL Server 0:20:00 Database Basics 0:20:00 Module 2. SQL Server Q&A: SQL Queries and Statements Lessons (2) ...
Also a common job interview question perhaps? I am using the AdventureWorksDW2012 database. Tests were done with SQL Server 2012 SP2 I run each query twice. Once with the base table and once with a covering Index. Here is the covering Index: 1 2 3 CREATE NONCLUSTERED INDEX _E_Dim...
Information from a previous student "asked in an interview". What is a linked server? Allows remote access and the ability to write queries directly on a database on another machine.Day03 What is a cursor? (A loop that allows row by row processing in a result set.In order to work ...