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📋 Schema
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employees
id
INT (PK)
name TEXT
department TEXT
salary REAL
hire_date TEXT
manager_id
INT (FK→id)
departments
id
INT (PK)
name TEXT
budget REAL
location TEXT
projects
id
INT (PK)
name TEXT
dept_id
INT (FK→departments)
status TEXT
deadline TEXT
sales
id
INT (PK)
emp_id
INT (FK→employees)
amount REAL
sale_date TEXT
region TEXT
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