DBMS Joins and Efficient Logic | Dataford Interview Questions

Explain the different types of joins in DBMS and describe how you implemented them in a DBMS project, including how you optimized pattern-drawing logic.

Use the provided project, owner, and task data to demonstrate the implementation. Include projects with no tasks and explain how unmatched records are handled.

Output

Return one row per project-pattern line for projects with a matching owner.
Include project_name, owner_name, task_count, line_number, and pattern_line.
Draw at least one line per project, with one additional asterisk per task, ordered by project name and line number.

Schema

projects

Column	Type	Description
project_idPK	INT	Unique project identifier
project_name	VARCHAR(100)	Project name
owner_id	INT	Reference to the project owner

project_owners

Column	Type	Description
owner_idPK	INT	Unique owner identifier
owner_name	VARCHAR(100)	Owner name
department	VARCHAR(100)	Owner department

project_tasks

Column	Type	Description
task_idPK	INT	Unique task identifier
project_id	INT	Reference to the project
task_name	VARCHAR(150)	Task name
task_note	VARCHAR(200)	Optional task note

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