
This video explains importance of data modelling in Power BI Desktop. Before you start working on any data using Power BI desktop you must create appropriate data models so that you can avoid lot of data structure problems later on.
This videos explains what are primary keys, foreign keys in any tables. How to identify them and why these are important for creating relationships inside Power BI Desktop.
People from Excel background are used to single table for analysis however when you are using Power BI Desktop it is recommended to have normalised dataset in multiple tables. This video explains how to perform normalisation on your table.
This video explain first rule of normalisation with regards to key only one information inside a single column. It also explains how to keep records in table so as to comply with this first rule of normalisation.
This video explain second rule of normalising the datasets.
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If you are planning to get started with Power BI and your data analytics journey it is very important that you follow a proper path to learn various concepts about data analytics.
Gathering the data- Perform your Extract > Transform > Load (ETL) activities.
Model your data - Normalizing your data is one of the critical step
Relationship between data tables - To understand the flow of information
DAX - Perform your data crunching and analysis
Visual analytics - Not just numbers and but pictorial presentation
I have covered ETL activities in my course titled - Power Bi Query Editor - Master Data Transformation. It have more than 6+ hours video content explaining all the concepts related to Power Query and M Language with the help of real world datasets.
Once you have completed above course you must move on to next step for Data Modelling, Relationships and DAX.
Currently various courses at Udemy will explain only DAX and will cover data modelling & relationship only briefly. However, structuring data properly is essential to achieving good performance in your reports and to maintaining a low level of complexity in your DAX formulas.
The easiest way to create a data model in Power BI is to gather the data “as is” from a data source, define relationships, and then start designing reports. But this approach raises several issues when you have too many tables, or different levels of granularity. This course will explain in detail how you can create appropriate data models by applying fundamental rules of normalizing your data.
For person starting with DAX it is little challenging as he may need to visualize in my mind what result he would get from the DAX formula he is writing. This can be confusing, so I have created this course which you will give simple and easy to understand explanation about using various DAX formulas. This course will guide you to deep understanding about various concepts of DAX like filter context, row context, evaluation context, Table or scalar DAX functions, Iterator DAX functions, Calculated Measures, Calculated Columns, etc.