What are some examples of schema evolution in databases?
An example of an AI chatbot conversation about schema evolution in databases.
What are some examples of schema evolution in databases?
Schema evolution refers to the changes in the database schema over time. Examples include adding new columns, changing data types, or removing tables.
Can you give me a specific example of adding a new column?
Sure! For instance, if you have a 'users' table and you want to add a 'birthdate' column, you would use an ALTER TABLE statement to add that column.
What about changing a data type? Can you explain that?
Absolutely! If you have a 'price' column defined as an integer and you want to change it to a decimal to allow for cents, you would use an ALTER TABLE statement to modify the column type.
Are there any risks associated with schema evolution?
Yes, risks include data loss, application downtime, and compatibility issues with existing queries or applications.
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