Peer Review

• The flow is easy to follow.
• The examples introduced is simple and directly addressing the learning topics.
• The immediate response of the SQL in exercises also help the users to see the sql results.
• It is most appropriate for the introduction on the SQL or the first few lessons on the database, not for the advanced usage. 

in summary, the content of the tutoiral is accurate and complete. It contains the basic knowledge about SQL. Learners should be able to learn how to write and interpret SQL.

• While the objectives are not explicitly stated, the concept to be learned in each page is clear to the learners.
• This SQL tutorial provides some useful and simple SQL instructions to the learned the basic concepts of SQL statements.
• It also gives examples to viewers to practice with what is learned using the on-line SQL interpreter and the immediate results are feedback.

In summary, the learning goals of the tutorial are very clear and easy to identify. It includes the explanation of different SQL statements and help learners to re-inforce their concept in working with relational database. There are some exercises which provide ways for students to attempt to apply the knowledge and assess their learning.

• It uses one simple example throughout the course, so that viewers do not need to learn the background of each case when learning a new concept.
• Users can try the exercise and get the feedback immediately. For better understanding, it would better the expected SQL results can also be given for some challenging questions.

In summary, the tutorial itself is easy to follow. The site is clear and consistent. Examples with tables are provided for helping learnings to realize the concepts. The exercise at the end of each unit allows learners to have self-assessment. 

There is a bit delay when loading the page, probably due to the advertisements in the Website. This reduces the usability of the tutorial. It may need some update as the "Database Links" are not reachable.