Which is best practice when working with Power Query?

Which is best practice when working with Power Query?

Some connectors will take advantage of your filters through query folding, as described in Power Query query folding . It’s also a best practice to filter out any data that isn’t relevant for your case.

How to create dynamic filters in Power Query?

These type-specific filters can help you create a dynamic filter that will always retrieve data that’s in the previous x number of seconds, minutes, hours, days, weeks, months, quarters, or years as showcased in the following image. To learn more about filtering your data based on values from a column, see Filter by values.

When to use power query for unstructured data?

But for unstructured data sources such as TXT and CSV files, it’s important that you set the correct data types for the columns coming from that data source. By default, Power Query offers an automatic data type detection for unstructured data sources. You can read more about this feature and how it can help you in Data types.

What to do when there are too many columns in a query?

If your query has a dynamic number of columns, but you only need to select specific columns from your dataset, you can use the Choose columns feature. To learn more about choosing or removing columns, see Choose or remove columns.

Is it possible to create multiple Power Query?

It’s entirely possible to create a single query that contains all the transformations and calculations that you may need. But if the query contains a large number of steps, then it might be a good idea to split the query into multiple queries, where one query references the next.

How to evaluate data based on multiple conditions?

In case you have to evaluate your data based on several sets of multiple conditions, you will have to employ both AND & OR functions at a time. In the above table, suppose you have the following criteria to evaluate the students’ success: If either of the above conditions is met, the final exam is deemed passed, otherwise – failed.

When to split a power query into multiple queries?

But if the query contains a large number of steps, then it might be a good idea to split the query into multiple queries, where one query references the next. The goal of this approach is to simplify and decouple transformation phases into smaller pieces so they’re easier to understand.

How to handle a many to many relationship in database?

Many-to-many: Multiple records in one table are related to multiple records in another table. Handling a one-to-one relationship or a one-or-many relationship can be done by adding the primary key of one table into the other table as a foreign key. However, for many-to-many relationships, it’s a bit different. Let’s have a look at an example.