Select FirstName,LastName,department,project_name,hours from employeetab,Project where employeetab.emp_id=Project.employeeid group by emp_id;   [please give the explaination of this sql code

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Multiple Table

In a database, a table is used to store data in the form of rows and columns. Rows are aligned horizontally and identified by one or more values in a specific column. Columns are vertically aligned and identified by a unique column name.