Author: user

What are the Query Operators supported by Snowflake

Snowflake supports most of the standard operators defined in SQL:1999. Arithmetic Operators + , – , * , / ,…

Amazon EBS

Amazon Elastic Block Store quick reference and cheat sheet

Amazon Elastic Block Store 1. Amazon EBS is Amazon Elastic Block Store. 2. EBS volumes are network attached storage. 3….

AWS Cloud Watch @

Amazon CloudWatch quick reference and cheat sheet

Amazon CloudWatch 1. Amazon CloudWatch provides you with data and actionable insights to monitor your applications. 2. With Amazon CloudWatch you…

PySpark @

PySpark how to get rows having nulls for a column or columns without nulls or count of Non null

pyspark.sql.Column.isNotNull isNotNull() : True if the current expression is NOT null. isNull() : True if the current expression is null. With…

PySpark @

PySpark – groupby with aggregation (count, sum, mean, min, max)

pyspark.sql.DataFrame.groupBy PySpark groupby functions groups the DataFrame using the specified columns to run aggregation ( count,sum,mean, min, max) on them….

PySpark @

PySpark filter : How to filter data in Pyspark – Multiple options explained.

pyspark.sql.DataFrame.filter PySpark filter function is used to filter the data in a Spark Data Frame, in short used to cleansing…

Amazon CloudFront @

Amazon CloudFront quick reference and cheat sheet

1. CloudFront gives developers an easy and cost-effective way to distribute content with low latency and high data transfer speeds….

Amazon Aurora @

Amazon Aurora quick reference and cheat sheet.

1. Aurora is an AWS proprietary database. 2. Aurora is a fully managed service. 3. Aurora have High performance and…

AWS Athena @

Amazon Athena quick reference and cheat sheet

1. Amazon Athena is an interactive query service to analyze data in Amazon S3 using standard SQL. 2. Athena is…

python @

Python throwing as NameError: name ‘__file__’ is not defined – Solution

On Executing  os.path.dirname(os.path.realpath(__file__)) in python interactive shell, you will get the error NameError: name ‘__file__’ is not defined. This is…