SQL-data-extraction

some data extraction work using SQL

Name		Name	Last commit message	Last commit date
Latest commit History 3 Commits
data		data
README.md		README.md
case_study_1.sql		case_study_1.sql
case_study_2.sql		case_study_2.sql
sql_cheating_assessment.sql		sql_cheating_assessment.sql

Provide feedback