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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

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 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A
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Aws management console popular features you need

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The AWS Management Console is a web application for managing Amazon Web Services. The console provides an intuitive user interface for performing many AWS tasks. These include working with Amazon S3 buckets, launching and connecting to Amazon EC2 instances, setting Amazon CloudWatch alarms, and so on.
Each service has its own console, which you can access from the AWS Management Console. The console also provides information about your account and about billing.
AWS console
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The following five service in AWS management console you will get are:

Getting start of Service: The AWS Management Console provides multiple ways for navigating to individual service consoles.  

To open a console for a service Do one of the following: 
  • Type the name of the service in the search box. Then choose the service that you want from the list of search results. Version 1.0 1 AWS Management Console Getting Started Guide Adding and Removing Shortcuts 
  • Choose one of your recently visited services under the search box.
  • Choose Services to open a full list of services. On the upper right of the page, choose Group to see the services listed by category or choose A–Z to see an alphabetical listing. Then choose the service that you want.
Add or removing shortcuts - You can add shortcuts for the consoles that you use most. To add a shortcut 
  • On the navigation bar, choose the pushpin icon.
  • Drag a service from the menu to the navigation bar. You can add more shortcuts and drop them onto the navigation bar in any order that you want. 
To remove a shortcut 
  • On the navigation bar, choose the pushpin icon. 
  • Drag the shortcut off the navigation bar.
Selecting a Region - For many services, you can select a region that specifies where your resources are managed. You do not select a region for the AWS Management Console or for some services, such as IAM. 

To select a region 
  • In the AWS Management Console, choose a service (p. 1) to go to that service's console. 
  • In the navigation bar, choose the name of the currently selected region. When you select a region, that region becomes the default in the console. Note If you have created AWS resources, but you don’t see those resources in the console, the console might be displaying resources from a different region. Some resources (such as EC2 instances) are created in a specific region. To see them, use the region selector to choose the region in which the resources were created. Amazon s3 Mastery - THE How-To' Guides For Amazon S3
Change password - If you are an account owner, you can change your AWS account password from the console. You can learn all AWS 7 services in 7 days.

To change your password
In the navigation bar, choose your account name. Version 1.0 2 AWS Management Console Getting Started Guide Getting Billing Information
  • Choose Security Credentials. 
  • The page you see varies with the type of account that you used to sign in. Follow the console instructions to get to the page for changing your password.
  • Type your current password once and your new password twice. The new password must be at least eight characters long and must include a symbol, a number, an uppercase letter, and a lowercase letter. 
  • When you've completed the password form, choose Change Password or Save changes.
Get Billing information - If you have the necessary permissions, you can get information about your AWS charges from the console. 

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To get your billing information 
  • In the navigation bar, choose your account name. 
  • Choose My Billing Dashboard. 
  • Use the AWS Billing and Cost Management dashboard to find a summary and a breakdown of your monthly spending. To learn more, see the AWS Billing and Cost Management User Guide
Use the device of your choice - The AWS Management Console has been designed to work on tablets as well as other kinds of devices: 
  • Horizontal and vertical space is maximized to show more on your screen. 
  • Buttons and selectors are larger for a better touch experience. The AWS Management Console is also available as an app for Android and iOS. This app provides mobilerelevant tasks that are a good companion to the full web experience. 
For example, you can easily view and manage your existing Amazon EC2 instances and Amazon CloudWatch alarms from your phone

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