Describe the command that is used to add a column to a


Problem

1. What is described in a schema file?

2. Explain in detail the use of validate_presence_of.

3. Describe the command that is used to add a column to a table of a database.

4. In what directory are style sheets stored?

5. What is a layout?

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Computer Engineering: Describe the command that is used to add a column to a
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