Data warehouse foreign keys

  • Do data warehouses have primary keys?

    For data warehouses that support primary keys (like Snowflake, Amazon Redshift, and Postgres), you can add a primary key indicator to the column you want to use as a primary key in the DDL to create the table.
    You may also use an ALTER DDL statement to set a column as a primary key if the table is already created..

  • How are foreign keys stored?

    Foreign key references are stored within a child table and links up to a primary key in a separate table.
    The column acting as a foreign key must have a corresponding value in its linked table.
    This creates referential integrity..

  • How does database foreign key work?

    A foreign key (FK) is a column or combination of columns that is used to establish and enforce a link between the data in two tables to control the data that can be stored in the foreign key table..

  • What are foreign keys in data?

    A foreign key is a column or columns of data in one table that refers to the unique data values -- often the primary key data -- in another table.
    Foreign keys link together two or more tables in a relational database..

  • What are the data warehouse keys?

    In data warehouse tables, natural keys are meaningful values that identify records, such as social security numbers that identify specific customers, calendar dates in a time dimension, or SKU numbers in a product dimension.
    However, some natural keys are not durable enough to serve as primary keys..

  • What is a foreign key in database?

    A foreign key is a column or columns of data in one table that refers to the unique data values -- often the primary key data -- in another table.
    Foreign keys link together two or more tables in a relational database..

  • What is foreign key in data warehouse?

    A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table.
    In order to add a row with a given foreign key value, there must exist a row in the related table with the same primary key value..

  • A data warehouse is a repository of data from an organization's operational systems and other sources that supports analytics applications to help drive business decision-making.
  • In data warehouse tables, natural keys are meaningful values that identify records, such as social security numbers that identify specific customers, calendar dates in a time dimension, or SKU numbers in a product dimension.
    However, some natural keys are not durable enough to serve as primary keys.
  • When you create a relationship between entities, the primary key attributes of the parent entity are automatically migrated to the child entity.
    The designator (FK) indicates the name of the migrated key attribute, also known as a foreign key.
Apr 22, 2010Yes, as a best practice, implement the FK constraints on your fact tables. In SQL Server, use NOCHECK. In ORACLE always use RELY DISABLE  Do you really need to use the primary-foreign key pattern in a data Is Foreign key required in Star or Snow flake schema?When to rename Date foreign keys? - data warehousePrimary and Foreign Key in DW tables - Stack OverflowMore results from stackoverflow.com
Foreign key constraints are rules that enforce the relationship between tables in a database. They ensure that the data in one table matches the data in another table, based on a common column or columns.

What is the difference between a foreign key and a composite key?

Foreign Key – In the fact table the primary key of other dimension table is act as the foreign key

Alternate key – It is also a unique value of the table and generally knows as secondary key of the table

Composite key – It consists of two or more attributes

For example, the entity has a clientID and a employeeCode as its primary key


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