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I feel the course could benefit from an additional module that explains SQL in greater depth. While the lessons introduced what the main clauses are, they didn’t go far enough in teaching how symbols affected how query is written. For example, the course didn’t initially explain the purposes or proper usage of keywords like AS, BETWEEN, nor did it clarify the role of brackets, quotes, semicolons, and other essential characters that impact whether a query runs correctly. Because of this, I often had to look up external tutorials on YouTube or Google just to understand basic syntax rules and how different SQL components fit together. While I did not mind performing my own research, I felt it took away from the learning experience. Having a dedicated glossary or a foundational guide that defines these common SQL terms, symbols, and functions would make a huge difference. It would help learners understand not just what a clause is, but how to apply it—and why certain words or characters are used in specific ways within a query. I say so because there were times I used wrong symbols, for instance ' vs ", or when semicolon ; on the end of query was needed and when not. On one of the practice test there was "END" used which I did not recall.

Dear teachers, These’re a couple of obstacles I found along the way: 1. In reference to the syntax symbols, I find it very difficult to know before hand when I have to introduce one between ‘___’   or “___”. Would you be clearer on that explanation? 2. Optional: upload the store transactions dataset to BigQuery: I could not cut and paste Step 11, for some reason (I tried several times). 3. Why must some functions be written in parentheses and some other not? DISTINCT, for example, doesn’t have parentheses, while CAST does. Could you please explain those basic concepts of the SQL syntax?

4. In one of the videos, “Documenting results and the cleaning process”, you jump from Pivot Tables and other spreadsheet features like Find and Replace, to Big Query without telling, which makes it difficult to follow along. I'm doing my best, but sometimes, especially in reference to the SQL syntax learning, I'm not achieving my goals, and feel very frustrated.

several practical exercices don't actually bring the expected results. I struggled more with using bigquery than i spent time actually learning SQL. I think the most troublesome part was creating tables (creating datasets was not a problem) : there was always a problem and it took me a long time to solve most of it (it's kind of okay now). I'll probably have to find more information somewhere else to catch up. The teacher is good and so is the pace but the practice is not as efficient as the one I had with the spreadsheets. I may also add that it would be great in the future to allow Coursera students to get access to some functions in the sandbox like updating or deleting in SQL, just so we get a chance to try it. To summarize : good teacher, good content but BigQuery is definitely not as user-friendly as R.