SQLBeginner
Intro to SQL: Querying and Managing Data
Khan Academy's interactive SQL course. Learn to create tables, insert data, query with SELECT, filter with WHERE, join tables, and aggregate with GROUP BY.
Free course on Coursera
The Google Data Analytics Professional Certificate is a Coursera program, and you take it at coursera.org. You can audit all eight courses for free, which gives you the video lessons and readings. The hands-on labs, graded quizzes, and the certificate need a Coursera subscription or per-course payment, and financial aid is available. Google builds and hosts it only on Coursera, so there is no separate free version elsewhere. We are not in Coursera's affiliate program, so we earn nothing whether you audit or pay. Audit it if you want the lessons for free, or pay for the full track if you want the graded projects and the Google credential on your resume.
The certificate bundles eight courses, and Coursera estimates about 6 months at 10 hours a week to finish (source: coursera.org/professional-certificates/google-data-analytics).
Google's data analytics certificate. Covers data cleaning, analysis, visualisation with Tableau, SQL queries, and R programming. Free to audit; certificate costs money.
SQLBeginner
Khan Academy's interactive SQL course. Learn to create tables, insert data, query with SELECT, filter with WHERE, join tables, and aggregate with GROUP BY.
SQLIntermediate
Learn SQL, PostgreSQL, and relational database concepts by completing projects in a Linux environment. Covers table design, joins, constraints, and database management. Free verified certificate.
SQLBeginner
Harvard's dedicated SQL course. Learn to design databases, write complex queries, use indexes, and work with SQLite, MySQL, and PostgreSQL.