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適用於在 互動式 SQL 與 PostgreSQL 課程的自學
  • 取得基礎 SQL 與 PostgreSQL 課程
    此互動式自學課程包含 60 個關卡,涵蓋所有必要主題:從基本的 SELECT 查詢到進階的 PL/pgSQL。 課程包含超過 300 堂講座與 400+ 實作任務。
  • 練習用 WebIDE
    我們打造了專門的練習環境,讓你可以安全地試驗 SQL 查詢與 PostgreSQL。 所有查詢即時執行,你能立即看到結果,透過實作學習而不必擔心破壞任何東西。
  • 實作任務
    本課程包含超過 400 個 SQL 與 PostgreSQL 的練習題,幫助你掌握所有關鍵技能。 你將學會如何建立與優化查詢、使用索引、配置事務,以及撰寫程序。每個練習都有清楚的說明與即時解答驗證。
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  • 即時任務驗證
    所有 SQL 查詢會自動且即時檢查。系統不僅檢查語法正確性,也會評估查詢效率。你會立即得到反饋並能改進解法。
  • 優化建議
    系統會分析你的 SQL 查詢並提供改進建議。例如,如何更有效地使用索引、如何優化 JOIN、如何妥善處理事務,以及建立高效能查詢。
評論 (1554)
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Karthik Rao K S
等級 18 , Mangalore, India
1 八月 2018, 15:59
I have visited numerous websites and applications that claim to teach Java in the best way possible. But Code Gym stands out of all those websites; because it does what it claims to do. The simplest to the most complex of topics of Java are explained in layman terms so that anyone irrespective of their educational background can learn, practice, and master Java. A major thumbs up to you, Code Gym!
Anonymous #11357650
等級 2 , Kenya
18 六月 2023, 09:06
But me I am not understanding why
Anonymous #11356534
等級 2 , South Africa
27 六月 2023, 14:32
mmmh i think you need to be a little bit serious and dedicate more time to practice and learning
Shenika
等級 0
22 一月 2025, 18:22
How abut Python?
30 七月 2019, 02:57
Just this morning I posted in another part that I would not be able to pay for the course. I've been around for 12 levels and I've definitely loved it. There is a saying that I've tried to stick to ever since I saw it: "empty your pockets to fill your mind, for once there will come a time where your mind will fill your pockets" I've got the money from a very close person and plan to take full advantage of the course. Happy coding, everyone!
Akash gupta
等級 1 , Sri Dungargarh, India
25 四月 2019, 15:47
System.out.println("Awesome mehtod of teaching programming. I really appreciate it.");
慢就是快 Enterprise Java Developer
28 十月 2021, 02:12
method :)
7 十二月 2023, 10:11
e
17 四月 2024, 11:48
Tara Edwards
等級 6 , United States
26 七月 2019, 12:56
I'm reluctantly transitioning from manual testing to test automation. I've started a lot of java courses online and this is the first time I feel like I might actually be "getting it"!
13 四月 2024, 01:23
e
Tangerin
等級 27 , Chongqing, China
7 七月 2019, 19:51
Absolutely love this website and its tutorial! I used to have a C class in university, but the professor is too dull and boring to pay attention to, I just skipped the whole course. But I passed the exam cuz I practice a lot, so I know that in programming, practice matter. And when I want to learn Java and found here...jeez, 80% practice, that's what makes you success, couldn't agree more.
Itgelsaikhan Enkhtur
等級 7 , Ulaanbaatar, Mongolia
25 十二月 2019, 13:08
Hello Tangerin. Can you say me please if I buy Premium account for one month it will contain all 40 levels? I want to finish all 40 lelvels but I can just buy one month Premium account. I saw that you loved this course site. Please answer me.
Maciej Blankenburg Java Developer
18 十一月 2022, 02:18
no, it is impossible, 12000 exercise even for me who is junior java developer is impossible in one month
mbaharchange
等級 1 , Germany, Germany
24 十一月 2022, 06:31
Tangerin, you've said it all😅
23 五月 2023, 04:07
12000? Actually, the real figure is 1200 exercises. Which is still challenging in one month.
Molchyn
等級 25 , Yahil'nytsya, Ukraine
31 七月 2019, 10:07
Thank you for this course, thank you for the work you have done. Since the theory, enshrined in a large practice, is a big plus of this course. Good luck to all. P.S. We are waiting for additions to the course
7 十二月 2023, 10:11
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Michael Coleman
等級 8 , South Carolina, United States
3 六月 2019, 05:53
I never thought coding was possible for me, but, so far, this program has been easy to understand and use. My only request would be to be able to see the best possible solution after getting a solution right, given that there are multiple ways to solve each task.
16 四月 2024, 10:42
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浩倫洪
等級 0 , Taiwan
19 八月 2024, 16:23
I
Kumar Vishal
等級 6 , India
1 八月 2018, 21:11
Something new... The story based approach is what i like the most and at each step there are exercises after a brief lesson which makes it more intriguing. Thanks a lot for such a step.
Prasanthi
等級 3 , Chennai, India
22 十月 2018, 08:37
This is really helpful. It is so different from Udemy lessons. All the task actually make me think a lot.....
nitesh
等級 3
2 八月 2018, 07:22
awesome way of teaching
16 四月 2024, 10:41
e