Schema and different types of dimensions, why should we use different types of schemas, queries related to self join and functions.

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Different types of schemas and dimensions, self join queries and functions in testing.

Different types of schemas include star schema, snowflake schema, and fact constellation schema.
Star schema is used for simple queries and is easy to understand.
Snowflake schema is used for complex queries and is normalized.
Fact constellation schema is used for complex queries and has multiple fact tables.
Self join queries are used to join a table to itself.
Functions are used to perform specific tasks and can be used in queries.
Examples of functions include aggregate functions, string functions, and date functions.

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