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8 Top AWS services before you learn read today

AWS provides various services. This post gives clear understanding on AWS top services. Not only for traditional services, it also offer services for Mobile  IoS and Android Os.


Aws Service catalog helps organizations to manage their IT services.
List of Top AWS  ServicesEC2LambdaS3DynamoDBIAMAmazon CognitioDevice FarmMobile analyticsSNS AWS EC2 Instance EC2: Amazon Elastic Compute Cloud (EC2) provides secure, scalable, on-demand hardware virtualization in the cloud.
Using Amazon EC2 eliminates the need to invest in server hardware up front so that users can focus on, develop, and deploy applications faster. 
EC2 instances come in various hardware configurations and include an operating system.

Lambda Function in AWS AWS Lambda lets users run snippets of code without provisioning an infrastructure. 
This service is billed on a pay-as-you-go model, with users only paying for the execution time of their lambda code. 
There is no charge when code is not running. Lambda code can be set up to…

SQL queries how to use built-in functions correctly

In this post I am giving top examples on SQL functions. About built-in functions, I have covered in my previous post.
sql examples on built-in functions

List of examples:

  1. DATE-TIME functions
  2. Numeric functions
  3. Char functions
  4. Null-related functions

1. DATE/TIME functions

SELECT p_code, launch_dt, CURRENT_DATE FROM product;
CURRENT_DATE returns current date.

SELECT p_code, TO_CHAR(launch_dt, 'DD MONTH YYYY') reformatted_dt FROM product;
TO_CHAR function returns DATE in CHAR format.

2. Numeric functions

SELECT p_code, price, (price - 20), ABS(price - 20.00) FROM product;
ABS - function returns absolute value

SELECT p_code, price, ROUND (price, 1) FROM product;
ROUND function - Round to 1 digit.

SELECT p_code, price, SIGN(price - 15) FROM product;
SIGN function - It returns sign; either + or -

SELECT p_code, price, TRUNC(price, 1) FROM product;
TRUNC function - Truncates to a certain number of decimal places.

3. CHAR functions

SELECT p_code, CONCAT(CONCAT(p_name, ' -- ') , price) FROM product;
CONCAT function - concats two strings.

SELECT p_name, LOWER(p_name), UPPER(p_name) FROM product;
UPPER function returns upper case.
LOWER function returns lower case.

SELECT p_name, LENGTH(p_name) FROM product;
LENGTH function returns length of the string.

SELECT SUBSTR(phone, 3) FROM customer;
SUBSTR function returns sub string from main string.

4. Null related functions

SELECT p_name, price, min_price,
COALESCE((price * 0.9), min_price, 5.0) sale_price FROM product;

COALESCE function: returns first non-null value from the expression.

Summary
  • Given list of top built-in functions
  • Example SQL queries on built-in function given for you to read quickly
  • These examples are almost common in any RDBMS

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Hyperledger Fabric Real Interview Questions Read Today

I am practicing Hyperledger. This is one of the top listed blockchains. This architecture follows R3 Corda specifications. Sharing the interview questions with you that I have prepared for my interview.

Though Ethereum leads in the real-time applications. The latest Hyperledger version is now ready for production applications. It has now become stable for production applications.
The Hyperledger now backed by IBM. But, it is still an open source. These interview questions help you to read quickly. The below set of interview questions help you like a tutorial on Hyperledger fabric. Hyperledger Fabric Interview Questions1). What are Nodes?
In Hyperledger the communication entities are called Nodes.

2). What are the three different types of Nodes?
- Client Node
- Peer Node
- Order Node
The Client node initiates transactions. The peer node commits the transaction. The order node guarantees the delivery.

3). What is Channel?
A channel in Hyperledger is the subnet of the main blockchain. You c…