Which of the following are characteristics of a dimension table?

The main characteristic of dimension tables is their multitude of attributes. Attributes are the columns that we summarize, filter, or aggregate. They have low cardinality and are usually textual and temporal. Dimensional tables have one primary key based on the underlying business key or a surrogate key.

What should a fact table contain?

The primary key of a fact table is usually a composite key that is made up of all of its foreign keys. Fact tables contain the content of the data warehouse and store different types of measures like additive, non-additive, and semi-additive measures.

What are the 3 types of fact tables?

The Three Types of Fact Tables
  • Transaction Fact Tables.
  • Periodic Snapshot Tables.
  • Accumulating Snapshot Tables.
  • Why Have They Not Changed?

What keys are present in fact table?

Each of the dimensional tables includes a primary key (product, time_code, customer, district_code), and the corresponding columns in the fact table are foreign keys. The fact table also has a primary (composite) key that is a combination of these four foreign keys.

What are the types of facts?

There are three types of facts: Summative facts: Summative facts are used with aggregation functions such as sum (), average (), etc. Semi summative facts: There are small numbers of quasi-summative fact aggregation functions that will apply. For example, consider bank account details.

What types of data are stored in fact tables?

A fact table or a fact entity is a table or entity in a star or snowflake schema that stores measures that measure the business, such as sales, cost of goods, or profit. Fact tables and entities aggregate measures , or the numerical data of a business.

How do you validate a fact table?

I know how to Test Dimension Table.
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How to check the data in the FACT Table is correct?
  1. Vefiying each column according to the business rules.
  2. Inserting is working correctly or not.
  3. Updating the data in the source would update accordingly in warehouse (wrt SCD type)
  4. Check for defualts.
  5. Check for Nulls.

Can we join two fact tables directly?

The answer for both is “Yes, you can“, but then also “No, you shouldn’t”. Joining fact tables is a big no-no for four main reasons: 1. Fact tables tend to have several keys (FK), and each join scenario will require the use of different keys.

Can fact table have textual information?

The fact table is the primary table that contains quantitative or factual data of the business although it may also contain textual attributes in order to limit number of dimension tables.

What is the most important points to take care while designing a fact table?

It is essential to declare the Fact grain at the design stage. Every fact table should have one grain and you should be having multiple grain levels in the same fact table.

Can fact tables have attributes?

Fact tables are used to store fact data. Since attributes provide context for fact values, both fact columns and attribute ID columns are included in fact tables.

Can fact table have textual information?

The fact table is the primary table that contains quantitative or factual data of the business although it may also contain textual attributes in order to limit number of dimension tables.

What is the name given to fact tables that does not contain any measures?

A factless fact table is a fact table that does not have any measures.

Can you have multiple fact tables?

No need for duplication.

You can have a single Date Dimention and conect it to multiple fact tables. Just be aware that when you filter the dimension date you will be filtering both fact tables.

Can you load fact table before dimension?

The process of loading the base schema requires that fact tables and dimension tables be loaded. Fact tables bear foreign keys to the dimension tables and are therefore dependent entities. This would suggest that dimension tables be loaded first.

Which schema has multiple fact tables?

A star schema is a data model that stores information in multiple table types: a single fact table and multiple dimensional tables.

Can we have 2 fact tables in star schema?

There is only one fact table in the Star schema if you have to use more than one then use the link tables in between them which is used as the reference table.

Can a star schema have 2 fact tables?

The Star Schema Design Pattern. A star schema consists of one fact table, and one or more dimension tables. The fact table contains information about changes. In the most basic kind of fact table, each row represents a transaction.