Bu kartlar henüz kaydedilmedi — sayfayı terk ettiğinde silinecekler. Saklamak ve aşağıdakilerin tümünün kilidini açmak için ücretsiz bir hesap oluştur.
How to find duplicate rows in a table?
SELECT column1, column2, COUNT() FROM table_name GROUP BY column1, column2 HAVING COUNT() > 1;
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to perform a left join and filter out nulls?
SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.id WHERE table2.column IS NOT NULL;
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What is a window function?
Operates over a set of rows related to the current row.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to rank data using a window function?
SELECT column1, RANK() OVER (ORDER BY column1) AS rank FROM table_name;
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to calculate cumulative sum for a column?
SELECT column1, SUM(column1) OVER (ORDER BY column1) AS cumulative_sum FROM table_name;
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What is the difference between UNION and UNION ALL?
UNION removes duplicates; UNION ALL keeps duplicates.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to import a CSV file into pandas DataFrame?
import pandas as pd; df = pd.read_csv('file.csv')
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to handle missing data in pandas?
df.fillna(value=0, inplace=True)
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to use list comprehensions in Python?
numbers = [x for x in range(10) if x % 2 == 0]
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What is the difference between apply() and map() in pandas?
apply() is for row/column-wise; map() is element-wise.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to visualize data using matplotlib?
import matplotlib.pyplot as plt; sns.histplot(df['column'], bins=10); plt.show()
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to calculate correlation in pandas?
def calculate_correlation(df, col1, col2): return df[col1].corr(df[col2])
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to use VLOOKUP in Excel?
=VLOOKUP(A2, Sheet2!A:B, 2, FALSE)
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to use XLOOKUP in Excel?
=XLOOKUP(A2, Sheet2!A:A, Sheet2!B:B)
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What is the difference between absolute and relative references?
Absolute (\(A\)1) does not change; Relative (A1) adjusts.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to create a pivot table in Excel?
Select the data > Insert > PivotTable.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What can you do with a pivot table?
Summarize data, perform aggregation, group data.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to use conditional formatting in Excel?
Select cells > Home > Conditional Formatting > New Rule.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to use IF, AND, OR functions in Excel?
=IF(AND(A1 > 10, OR(B1 < 5, C1 = 20)), 'Pass', 'Fail')
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to create a calculated column in Power BI?
Use DAX: New Column = Table[column1] + Table[column2].
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What is the difference between slicer and filter in Power BI?
Slicer is visual; filter is backend-level.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to create relationships between tables in Power BI?
Manage relationships under 'Model' view.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to set up row-level security in Power BI?
Define roles in 'Modeling' > Manage Roles.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What is the purpose of CALCULATE and FILTER in DAX?
CALCULATE() changes context; FILTER() applies filters.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How do you create a calculated field in Tableau?
Go to 'Analysis' > 'Create Calculated Field'.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What types of calculations can you perform in Tableau?
Basic arithmetic, logical tests, aggregate functions.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
What is a parameter in Tableau?
A dynamic input that users can control to change views.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How can parameters be used in Tableau?
To filter views, change calculations, or control data shown.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How do you create a dual-axis chart in Tableau?
Drag two measures to Rows or Columns, right-click an axis, select 'Dual-Axis'.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to optimize a Tableau dashboard for performance?
Use extracts, reduce filters, limit high-granularity data, minimize worksheets.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How do you create a custom date filter in Tableau?
Use a calculated field with date parameters to filter ranges.
Kartlarına buradan göz at, veya sign up to study with spaced repetition.
How to find duplicate rows in a table?
SELECT column1, column2, COUNT() FROM table_name GROUP BY column1, column2 HAVING COUNT() > 1;
How to perform a left join and filter out nulls?
SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.id WHERE table2.column IS NOT NULL;
What is a window function?
Operates over a set of rows related to the current row.
How to rank data using a window function?
SELECT column1, RANK() OVER (ORDER BY column1) AS rank FROM table_name;
How to calculate cumulative sum for a column?
SELECT column1, SUM(column1) OVER (ORDER BY column1) AS cumulative_sum FROM table_name;
What is the difference between UNION and UNION ALL?
UNION removes duplicates; UNION ALL keeps duplicates.
How to import a CSV file into pandas DataFrame?
import pandas as pd; df = pd.read_csv('file.csv')
How to handle missing data in pandas?
df.fillna(value=0, inplace=True)
How to use list comprehensions in Python?
numbers = [x for x in range(10) if x % 2 == 0]
What is the difference between apply() and map() in pandas?
apply() is for row/column-wise; map() is element-wise.
How to visualize data using matplotlib?
import matplotlib.pyplot as plt; sns.histplot(df['column'], bins=10); plt.show()
How to calculate correlation in pandas?
def calculate_correlation(df, col1, col2): return df[col1].corr(df[col2])
How to use VLOOKUP in Excel?
=VLOOKUP(A2, Sheet2!A:B, 2, FALSE)
How to use XLOOKUP in Excel?
=XLOOKUP(A2, Sheet2!A:A, Sheet2!B:B)
What is the difference between absolute and relative references?
Absolute (\(A\)1) does not change; Relative (A1) adjusts.
How to create a pivot table in Excel?
Select the data > Insert > PivotTable.
What can you do with a pivot table?
Summarize data, perform aggregation, group data.
How to use conditional formatting in Excel?
Select cells > Home > Conditional Formatting > New Rule.
How to use IF, AND, OR functions in Excel?
=IF(AND(A1 > 10, OR(B1 < 5, C1 = 20)), 'Pass', 'Fail')
How to create a calculated column in Power BI?
Use DAX: New Column = Table[column1] + Table[column2].
What is the difference between slicer and filter in Power BI?
Slicer is visual; filter is backend-level.
How to create relationships between tables in Power BI?
Manage relationships under 'Model' view.
How to set up row-level security in Power BI?
Define roles in 'Modeling' > Manage Roles.
What is the purpose of CALCULATE and FILTER in DAX?
CALCULATE() changes context; FILTER() applies filters.
How do you create a calculated field in Tableau?
Go to 'Analysis' > 'Create Calculated Field'.
What types of calculations can you perform in Tableau?
Basic arithmetic, logical tests, aggregate functions.
What is a parameter in Tableau?
A dynamic input that users can control to change views.
How can parameters be used in Tableau?
To filter views, change calculations, or control data shown.
How do you create a dual-axis chart in Tableau?
Drag two measures to Rows or Columns, right-click an axis, select 'Dual-Axis'.
How to optimize a Tableau dashboard for performance?
Use extracts, reduce filters, limit high-granularity data, minimize worksheets.
How do you create a custom date filter in Tableau?
Use a calculated field with date parameters to filter ranges.
Silmek istediğine emin misin 0 kart(lar)? Bu işlem geri alınamaz.
Silinecek etiketleri seç 0 seçili kart(lar):
Etiketler yükleniyor...