Библиотека баз данных
Самая большая библиотека бесплатных книг по SQL По всем вопросам- @haarrp @ai_machinelearning_big_data - machine learning @pythonl - Python @itchannels_telegram - 🔥 best it channels @ArtificialIntelligencedl - AI РКН: № 5037640984
Show more📈 Analytical overview of Telegram channel Библиотека баз данных
Channel Библиотека баз данных (@sql_lib) in the Russian language segment is an active participant. Currently, the community unites 10 156 subscribers, ranking 11 993 in the Technologies & Applications category and 62 569 in the Russia region.
📊 Audience metrics and dynamics
Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 10 156 subscribers.
According to the latest data from 26 October, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -23 over the last 30 days and by 0 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 8.40%. Within the first 24 hours after publication, content typically collects N/A% reactions from the total number of subscribers.
- Post reach: On average, each post receives 853 views. Within the first day, a publication typically gains 0 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 12.
- Thematic interests: Content is focused on key topics such as sql, субд, индекс, user_id, архитектура.
📝 Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
“Самая большая библиотека бесплатных книг по SQL
По всем вопросам- @haarrp
@ai_machinelearning_big_data - machine learning
@pythonl - Python
@itchannels_telegram - 🔥 best it channels
@ArtificialIntelligencedl - AI
РКН: № 5037640984”
Thanks to the high frequency of updates (latest data received on 27 October, 2026), the channel maintains relevance and a high level of publication reach. Analytics show that the audience actively interacts with content, making it an important point of influence in the Technologies & Applications category.
SQLISGREAT
🚀 Прокачаю свои знания: https://stepik.org/course/255542/
SELECT DISTINCT ON (customer_id)
customer_id,
order_date,
amount
FROM orders
ORDER BY customer_id, order_date DESC;
🔎 Этот запрос вернёт последний заказ каждого клиента без лишних подзапросов или JOIN.
⚡ Работает очень быстро и удобно, если нужно найти «самый первый» или «самый последний» элемент в группе.