> NULL Summary Table: Concept Rule What is NULL Absence of any value NULL = NULL FALSE - never equal NULL = 0 FALSE - completely different Check for NULL Use IS NULL / IS NOT NULL Math with NULL Always results in NULL Replace NULL Use NVL() function NULL in ASC orderAppears LAST NULL in DESC orderAppears FIRST #OracleSQL #NullValues #NVL #IsNull #COALESCE #LearnSQL #SQLBeginners #Day9 #100DaysOfCode #TechTwitter

Identifying and solving null values is such an important task when you are working as a data analyst. Also, when you use Python for data analysis for various tasks such as automation, cleaning, EDA, in-depth analysis, and more, you will be using pandas for data manipulation and analysis. Today let's understand how you can check if a variable has null values using Python and pandas. The answer is very simple by using the ".isna()" function. 𝗦𝗼, 𝘄𝗵𝗲𝗻𝗲𝘃𝗲𝗿 𝘆𝗼𝘂 𝘄𝗮𝗻𝘁 𝘁𝗼 𝗰𝗵𝗲𝗰𝗸 𝗶𝗳 𝗮 𝗰𝗼𝗹𝘂𝗺𝗻 𝗰𝗼𝗻𝘁𝗮𝗶𝗻𝘀 𝗻𝘂𝗹𝗹 𝘃𝗮𝗹𝘂𝗲𝘀 𝗶𝗻 𝗣𝘆𝘁𝗵𝗼𝗻, 𝗷𝘂𝘀𝘁 𝗿𝘂𝗻 𝘁𝗵𝗲 𝗴𝗶𝘃𝗲𝗻 𝘀𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁: df['column_name'].isna() This will return a series of boolean values, where True means a specific row has a null value in that column, and False means it does not. So, this was a quick tutorial on how to check if a variable has null values or not in Python as a data analyst. Enjoy and Follow for more! #DataAnalysis #PythonForData #PandasLibrary #DataCleaning #NullValues #DataAutomation #DataScience #PythonTips #DataAnalystTools #EDA #DataManipulation #PythonProgramming #DataInsights #DataJobsUSA #PythonDataUSA #AnalyticsCareersUSA #DataAnalystUK #PythonUK #AnalyticsUK #DataAnalystEurope #PythonEurope #AnalyticsEurope #GlobalDataJobs #PythonWorldwide #DataScienceGlobal #DataCareersGlobal

NULL values are an important part of managing data and information stored in SQL tables. Do you have any issues dealing with Null values in SQL? Tell us 👇🏾 #learnsql #nullvalues #sql #data

Day 17 of #20dayswithdata. Today's challenge requires that I include a note on how to handle NULL values. The snapshot below highlights three ways you can deal with NULL values in a dataset. #NULLValues #DataCleaning

Day 17 Handling Null values. How to handle null value 1. Remove rows with null values as long as it does not affect your result and still have an ample sample size 2. Replace the null data box with specific values - 0 or N/A #20dayswithdata #Datacleaning #Nullvalues

Day 17. A NULL value is usually a placeholder for an unknown value. First, consider SQL commands and how they react to nulls. This will prevent incorrect queries, and is dependent on the needed output e.g. COUNT(*) will take nulls into consideration, while COUNT(column_name) will focus on only rows that have a known value in that column. Using UPDATE, SET, and WHERE commands, NULL values in a column or table can be identified and replaced by a more meaningful value. The IS NULL or IS NOT NULL functions can be used to return rows that contain or do not contain NULL values in a column, respectively. When calculating the average value of a column, NULL values are usually not considered and this is because, as expected, they are unknown. Case statements are another great way of handling NULL values, usually with expected conditions attached in the query. Finally, using the COALESCE function is another way to handle NULL values. This function accepts a number of expressions and return the first non-null expression. Handling NULL Values is a very important aspect of data cleaning with SQL. If improperly addressed, there is usually the risk of generating faulty information and insights from our database. #20dayswithdata #NULLValues #DataCleaning

Day17: working with Null values #20dayswithdata #NULLValues #DataCleaning #HTTDataChallenge @ImaNjokko @phaibooboo @AtiJoshua @vicSomadina @OMOTOSHOOLAMI15 @fresh_gb

Day 17: Working with NULL Values @phaibooboo @ImaNjokko @fresh_gb @vicSomadina @AtiJoshua @OMOTOSHOOLAMI15 #20dayswithdata #hertechtrailacademy #HTTDataChallenge #NULLValues #DataCleaning

3)CASE statement can be used to define that if a record has NULL value then replace it with a value of our choice. #20dayswithdata #hertechtrailacademy #HTTDataChallenge #NULLValues #DataCleaning @hertechtrail @phaibooboo @fresh_gb @vicSomadina

Day 17. Its all about NULL values today. Lets gooooo!!! You can use the hashtags #20dayswithdata #NULLValues #DataCleaning.

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Día 67 de #100DaysOfData: ¡Hoy aprendí sobre cómo manejar valores nulos! 🤓 Descubrí cuándo es mejor reemplazarlos por la media o la mediana. Fue un día técnico, pero muy interesante. 📊 #DataScience #NullValues #Python

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