Data Analysis Books | Python | SQL | Excel | Artificial Intelligence | Power BI | Tableau | AI Resources
Data Analysis Useful Resources #dataanalysis #dataanalysisbooks #sqlbooks #pythonbooks #tableau #powerbi #datavisualization For promotions: @coderfun
Показати більше📈 Аналітичний огляд Telegram-каналу Data Analysis Books | Python | SQL | Excel | Artificial Intelligence | Power BI | Tableau | AI Resources
Канал Data Analysis Books | Python | SQL | Excel | Artificial Intelligence | Power BI | Tableau | AI Resources (@learndataanalysis) у мовному сегменті Англійська є активним учасником. На даний момент спільнота об'єднує 53 311 підписників, посідаючи 3 300 місце в категорії Освіта та 6 549 місце у регіоні Індія.
📊 Показники аудиторії та динаміка
З моменту свого створення невідомо, проект продемонстрував стрімке зростання, зібравши аудиторію у 53 311 підписників.
За останніми даними від 28 жовтня, 2026, канал демонструє стабільну активність. Хоча за останні 30 днів спостерігається зміна кількості учасників на 70, а за останні 24 години на -12, загальне охоплення залишається високим.
- Статус верифікації: Не верифікований
- Рівень залученості (ER): Середній показник залученості аудиторії становить 7.02%. Протягом перших 24 годин після публікації контент зазвичай збирає N/A% реакцій від загальної кількості підписників.
- Охоплення публікацій: В середньому кожен допис отримує 0 переглядів. Протягом першої доби публікація в середньому набирає 0 переглядів.
- Реакції та взаємодія: Аудиторія активно підтримує контент: середня кількість реакцій на один пост – 0.
- Тематичні інтереси: Контент зосереджений навколо ключових тем, таких як analyst, |--, excel, visualization, analytic.
📝 Опис та контентна політика
Автор описує ресурс як майданчик для висловлення суб'єктивної думки:
“Data Analysis Useful Resources
#dataanalysis
#dataanalysisbooks
#sqlbooks
#pythonbooks
#tableau
#powerbi
#datavisualization
For promotions: @coderfun”
Завдяки високій частоті оновлень (останні дані отримано 29 жовтня, 2026), канал підтримує актуальність та високий рівень охоплення публікацій. Аналітика показує, що аудиторія активно взаємодіє з контентом, що робить його важливою точкою впливу в категорії Освіта.
ROW_NUMBER(), RANK(), DENSE_RANK(), NTILE(), and LAG()/LEAD(). These functions allow you to perform calculations across a set of table rows related to the current row without collapsing the result set into a single output.
2. Common Table Expressions (CTEs): Understand how to use CTEs with the WITH clause to create temporary result sets that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement. CTEs improve the readability and maintainability of complex queries.
3. Recursive CTEs: Learn how to use recursive CTEs to solve hierarchical or recursive data problems, such as navigating organizational charts or bill-of-materials structures.
4. Advanced Joins: Master complex join techniques, including self-joins (joining a table with itself), cross joins (Cartesian product), and using multiple joins in a single query.
5. Subqueries and Correlated Subqueries: Be adept at writing subqueries that return a single value or a set of values. Correlated subqueries, which reference columns from the outer query, are particularly powerful for row-by-row operations.
6. Indexing Strategies: Learn advanced indexing strategies, such as covering indexes, composite indexes, and partial indexes. Understand how to optimize query performance by designing the right indexes and when to use CLUSTERED versus NON-CLUSTERED indexes.
7. Query Optimization and Execution Plans: Develop skills in reading and interpreting SQL execution plans to understand how queries are executed. Use tools like EXPLAIN or EXPLAIN ANALYZE to identify performance bottlenecks and optimize query performance.
8. Stored Procedures: Understand how to create and use stored procedures to encapsulate complex SQL logic into reusable, modular code. Learn how to pass parameters, handle errors, and return multiple result sets from a stored procedure.
9. Triggers: Learn how to create triggers to automatically execute a specified action in response to certain events on a table (e.g., AFTER INSERT, BEFORE UPDATE). Triggers are useful for maintaining data integrity and automating workflows.
10. Transactions and Isolation Levels: Master the use of transactions to ensure that a series of SQL operations are executed as a single unit of work. Understand different isolation levels (READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, SERIALIZABLE) and their impact on data consistency and concurrency.
11. PIVOT and UNPIVOT: Use the PIVOT operator to transform row data into columnar data and UNPIVOT to convert columns back into rows. These operations are crucial for reshaping data for reporting and analysis.
12. Dynamic SQL: Learn how to write dynamic SQL queries that are constructed and executed at runtime. This is useful when the exact SQL query cannot be determined until runtime, such as in scenarios involving user-defined filters or conditional logic.
13. Data Partitioning: Understand how to implement data partitioning strategies, such as range partitioning or list partitioning, to manage large tables efficiently. Partitioning can significantly improve query performance and manageability.
14. Temporary Tables: Learn how to create and use temporary tables to store intermediate results within a session. Understand the differences between local and global temporary tables, and when to use them.
15. Materialized Views: Use materialized views to store the result of a query physically and update it periodically. This can drastically improve performance for complex queries that need to be executed frequently.
16. Handling Complex Data Types: Understand how to work with complex data types such as JSON, XML, and arrays. Learn how to store, query, and manipulate these types in SQL databases, including using functions like JSON_EXTRACT(), XMLQUERY(), or array functions.
Here you can find SQL Interview Resources👇
https://t.me/DataSimplifier
Share with credits: https://t.me/sqlspecialist
Hope it helps :)SELECT AVG(salary) AS average_salary FROM employees;
Find Median (Using Window Functions) SELECT salary FROM ( SELECT salary, ROW_NUMBER() OVER (ORDER BY salary) AS row_num, COUNT(*) OVER () AS total_rows FROM employees ) subquery WHERE row_num = (total_rows / 2);
Find Mode (Most Frequent Value)
SELECT department, COUNT(*) AS count FROM employees GROUP BY department ORDER BY count DESC LIMIT 1;
Calculate Variance & Standard Deviation
SELECT VARIANCE(salary) AS salary_variance, STDDEV(salary) AS salary_std_dev FROM employees;
In Python (Pandas):
Mean, Median, Mode
df['salary'].mean() df['salary'].median() df['salary'].mode()[0]
Variance & Standard Deviation
df['salary'].var() df['salary'].std()
2️⃣ Data Visualization
Visualizing data helps identify trends, outliers, and patterns.
In SQL (For Basic Visualization in Some Databases Like PostgreSQL):
Create Histogram (Approximate in SQL)
SELECT salary, COUNT(*) FROM employees GROUP BY salary ORDER BY salary;
In Python (Matplotlib & Seaborn):
Bar Chart (Category-Wise Sales)
import matplotlib.pyplot as plt
import seaborn as sns
df.groupby('category')['sales'].sum().plot(kind='bar')
plt.title('Total Sales by Category')
plt.xlabel('Category')
plt.ylabel('Sales')
plt.show()
Histogram (Salary Distribution)
sns.histplot(df['salary'], bins=10, kde=True)
plt.title('Salary Distribution')
plt.show()
Box Plot (Outliers in Sales Data)
sns.boxplot(y=df['sales'])
plt.title('Sales Data Outliers')
plt.show()
Heatmap (Correlation Between Variables)
sns.heatmap(df.corr(), annot=True, cmap='coolwarm') plt.title('Feature Correlation Heatmap') plt.show()
3️⃣ Detecting Anomalies & Outliers
Outliers can skew results and should be identified.
In SQL:
Find records with unusually high salaries
SELECT * FROM employees WHERE salary > (SELECT AVG(salary) + 2 * STDDEV(salary) FROM employees);
In Python (Pandas & NumPy):
Using Z-Score (Values Beyond 3 Standard Deviations)
from scipy import stats df['z_score'] = stats.zscore(df['salary']) df_outliers = df[df['z_score'].abs() > 3]
Using IQR (Interquartile Range)
Q1 = df['salary'].quantile(0.25)
Q3 = df['salary'].quantile(0.75)
IQR = Q3 - Q1
df_outliers = df[(df['salary'] < (Q1 - 1.5 * IQR)) | (df['salary'] > (Q3 + 1.5 * IQR))]
4️⃣ Key EDA Steps
Understand the Data → Check missing values, duplicates, and column types
Summarize Statistics → Mean, Median, Standard Deviation, etc.
Visualize Trends → Histograms, Box Plots, Heatmaps
Detect Outliers & Anomalies → Z-Score, IQR
Feature Engineering → Transform variables if needed
Mini Task for You: Write an SQL query to find employees whose salaries are above two standard deviations from the mean salary.
Here you can find the roadmap for data analyst: https://t.me/sqlspecialist/1159
Like this post if you want me to continue covering all the topics! ❤️
Share with credits: https://t.me/sqlspecialist
Hope it helps :)
#sql