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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problem1 what is described in a schema file2 explain in detail the use of validatepresenceof3 describe the command that
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