What is a database schema?
A database schema is a definition for how to organize data within a relational database.  a relational database can also have multiple schemas.  Schemas may also describe the source system the data in that schema comes from.  Schema includes table names, fields, data types, and the relationships between all these items.  Schemas are visually represented using Entity Relationship Diagrams (ERDs), and the process of creating schema definitions is called data modeling.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
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Answer the following query.
What is a database schema?

user
A database schema is a definition for how to organize data within a relational database.  a relational database can also have multiple schemas.  Schemas may also describe the source system the data in that schema comes from.  Schema includes table names, fields, data types, and the relationships between all these items.  Schemas are visually represented using Entity Relationship Diagrams (ERDs), and the process of creating schema definitions is called data modeling.
assistant