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學生對 加州大学戴维斯分校 提供的 Data Wrangling, Analysis and AB Testing with SQL 的評價和反饋

366 個評分
145 條評論


This course allows you to apply the SQL skills taught in “SQL for Data Science” to four increasingly complex and authentic data science inquiry case studies. We'll learn how to convert timestamps of all types to common formats and perform date/time calculations. We'll select and perform the optimal JOIN for a data science inquiry and clean data within an analysis dataset by deduping, running quality checks, backfilling, and handling nulls. We'll learn how to segment and analyze data per segment using windowing functions and use case statements to execute conditional logic to address a data science inquiry. We'll also describe how to convert a query into a scheduled job and how to insert data into a date partition. Finally, given a predictive analysis need, we'll engineer a feature from raw data using the tools and skills we've built over the course. The real-world application of these skills will give you the framework for performing the analysis of an AB test....



A good course for learning and apply sql to conduct analysis on ab testing results. Would be better if the instructor could provide more info about how to design and apply AB Testing on the customers


The instructor is very smart and her syllabus is very easy to follow. The real life examples are great and helps put ideas in perspective! I would definitely recommend this course and already have!


126 - Data Wrangling, Analysis and AB Testing with SQL 的 145 個評論(共 145 個)

創建者 Mei H


It is really hard to follow.

創建者 Якухин В С


Did not like

創建者 Justin M


This course did deal with some useful ideas; things like research design, statistical testing, and what to do with data that isn't cleanly structured. A lot of times, it was like the instructor was taking a normal day on a data science job and walking you through it.

The issue is the lack of structure to the course. Because it was like a a day on a job, there weren't explicit learning goals. Things like "Today we're going to learn how to clean messy data" isn't a learning goal. Instead, you want something like "Here are some ways in which data are messy. I'll walk you through what I do with each one."

The assignments reflect this. I can't stress enough how poorly the assignments supported my learning. The assignments were usually very vague, with instructions that I had to parse through to understand what was even required of me. Questions that just asked open-ended "Does this look right?" kind of questions? I mean... looks fine to me, but I'm literally in a beginner SQL course so what do I know? Then we watch a solutions video where the instructor writes the code to answer it. It lacks any kind of student engagement and doesn't facilitate learning at all.

It's really indicative of the lack of structure of the course. Since there aren't learning goals, there isn't any framework from which to design assignments. The information lacks context, so it doesn't seem useful until the very final assignment, when you need to have learned the A/B testing stuff (but not really anything else). The course material doesn't build together in a logical fashion. I feel like you could take the 4 modules in any order and you'd get the same out of it. This suggests that there isn't a core skill that's being developed over time, but rather a mishmash of ideas that might be useful in a data science position.

In all, I can't recommend this course. The instructor is an excellent data scientist, I'm sure. But her teaching could use some work.

創建者 Joseph C


Very poor course. The information was very hard to interpret as the videos provided in the course did not give live output of the query being used or highlight the important sections that were being described. Additionally, the actions requested in the quizzes were incredibly vague and did not prompt the learner for what was actually being asked. This made it nigh impossible to complete the course as it was set up to accomplish. It did not ever even explicitly state which SQL language was being used (note it is different from the language used in the first course in the series). Finally, the crux of course was to teach AB Testing with SQL, however, it was explained in a fashion that was not clear or concise and did not demonstrate a real world sense of how it could be implemented in a work environment, how to set up an experiment, or even how it was accomplishing the task through SQL.

Hopefully it will make more sense as I go over the course from the beginning, but please be aware that this course was not well constructed and any insight that you might glean from it will require much more research on your part.

This course's concepts were not well explained, demonstrated, or executed.

Do not recommend...

創建者 Frank P


I'll start by saying that the subjects you are supposed to learn are important, and if you do a lot of separate study this course might be very good for you. However, the way it is taught is poor. The content is disorganized and not explained well, leaving you to have to do separate research. I'm not one to bash students needing to do their own research, however this class offers no guidance. The first course of this specialization was great, and I've heard great things of all of the courses that follow this one. However this course is a miss.

The concepts are good but the execution is terrible. Not enough time was spent on the lectures, the examples that are worked through aren't taught properly, you're just watching the instructor do the assignment with very little good explanation.

Personally, I'd recommend this course be reworked to be more descriptive in each section. An extra 2 weeks to allow the instructor to take her time teaching the concepts is a very good idea. The homework/assignments also need to have their instructions rewritten to be more clear.

創建者 Thibaut C


This is a very practical course, with barely no theoretical aspect. You will get more experience of SQL with this course, that is for sure. The videos have very little actual content, they are more an introduction for the practical part that follows.

However, the instructor builds a sequence of strangely named metrics, and supposes you master it in a second. This is especially unhelpful for the project, where the questions are poorly presented and keep on using this vocabulary.

You will have to use another platform to test your code, which is not a bad thing per se. The problem is that this platform is far from intuitive…

This course seems to lack proper planning.

創建者 Anirudh


This course was not planned out well. I would be hard-pressed to believe that the people who created this specialization had any pedagogical training whatsoever.

Many of the exercises are only partially written and are littered with inconsistencies, typos, and poor instructions. I would suggest to the course creators that they should hire an editor, or at least someone to look over these courses prior to hitting publish.

I honestly would not recommend this specialization to anyone at any stage of learning SQL.

I did like that this course chose to use Mode to run the SQL queries. They seem to have many example datasets already loaded.

創建者 Andrés B


I don't like it, The metodology is a bit confusing; I realized at middle of the course that i need to save the SQL queries in order to use latter, so, should be mandatory and will be usefull to advertise it at the beginning of the course.

創建者 Dev G


Code in lectures not explained properly. Discussion prompts with questions asked - these questions were not covered extensively beforehand. There are videos of solutions afterwards- but these discussion prompts seemed pointless.

創建者 Minal A


Poorly designed course. Exercise are not good, instructions are unclear.

Wasted so much time to figure out what to do next, how to do it with unclear instructions.

Covered important concepts but couldn't practice them through

創建者 Jeffrey C L


I am withdrawing from this course. The firs section was great with Sadie. The second, data wrangling, is very difficult to follow, feels very unorganized and without direction.

創建者 Pieter W


Work on the assignments, define the question and more important point out exactly what's been asking for.

創建者 Shreyas K


The instructor is really bad

Didn't explain the concepts and solutions of the questions efficiently

創建者 Wai K C


The course structure isn't well-planned. It is very confusing, messy and it didn't help me much

創建者 Jing S


The instructor is terribly bad- -. No clearly point, no useful exercise. Her logic is mess

創建者 陈照


the lectures are so unclear. Colossal waste of time.

創建者 Nicolas V


Explanations and exercises unclear

創建者 Christofer H


Worst course i ever did.

創建者 Fosca F


it is really badly done

創建者 Ziyang F