new code

Author: ankurbhambri

30_question/category_month_wise.sql

@@ -0,0 +1,21 @@
+SELECT 
+    category,
+    SUM(CASE WHEN Extract(month from transaction_date) = 1 THEN amount ELSE 0 END) AS January,
+    SUM(CASE WHEN Extract(month from transaction_date) = 2 THEN amount ELSE 0 END) AS Feburary,
+    SUM(CASE WHEN Extract(month from transaction_date) = 3 THEN amount ELSE 0 END) AS March,
+    SUM(CASE WHEN Extract(month from transaction_date) = 4 THEN amount ELSE 0 END) AS April,
+    SUM(CASE WHEN Extract(month from transaction_date) = 5 THEN amount ELSE 0 END) AS May,
+    SUM(CASE WHEN Extract(month from transaction_date) = 6 THEN amount ELSE 0 END) AS June,
+    SUM(CASE WHEN Extract(month from transaction_date) = 7 THEN amount ELSE 0 END) AS July,
+    SUM(CASE WHEN Extract(month from transaction_date) = 8 THEN amount ELSE 0 END) AS August,
+    SUM(CASE WHEN Extract(month from transaction_date) = 9 THEN amount ELSE 0 END) AS September,
+    SUM(CASE WHEN Extract(month from transaction_date) = 10 THEN amount ELSE 0 END) AS October,
+    SUM(CASE WHEN Extract(month from transaction_date) = 11 THEN amount ELSE 0 END) AS November,
+    SUM(CASE WHEN Extract(month from transaction_date) = 12 THEN amount ELSE 0 END) AS December
+FROM 
+    transactions
+GROUP BY 
+    category
+ORDER BY 
+    category;
+

tricky_questions/attende_interval.sql

@@ -0,0 +1,73 @@
+
+/*
+
+-- Create the EmployeeAttendance table
+CREATE TABLE EmployeeAttendance (
+    EmployeeID VARCHAR(10),
+    Date DATE,
+    Status VARCHAR(10)
+);
+
+-- Input 
+
+INSERT INTO EmployeeAttendance (EmployeeID, Date, Status) VALUES
+('A1', '2024-01-01', 'PRESENT'),
+('A1', '2024-01-02', 'PRESENT'),
+('A1', '2024-01-03', 'PRESENT'),
+('A1', '2024-01-04', 'ABSENT'),
+('A1', '2024-01-05', 'PRESENT'),
+('A1', '2024-01-06', 'PRESENT'),
+('A1', '2024-01-07', 'ABSENT'),
+('A1', '2024-01-08', 'ABSENT'),
+('A1', '2024-01-09', 'ABSENT'),
+('A1', '2024-01-10', 'PRESENT'),
+('A2', '2024-01-06', 'PRESENT'),
+('A2', '2024-01-07', 'PRESENT'),
+('A2', '2024-01-08', 'ABSENT'),
+('A2', '2024-01-09', 'PRESENT'),
+('A2', '2024-01-10', 'ABSENT');
+
+
+-- Output
+
+EMPLOYEE | FROM_DATE   | TO_DATE     | STATUS
+--------------------------------------------
+A1       | 2024-01-01  | 2024-01-03  | PRESENT
+A1       | 2024-01-04  | 2024-01-04  | ABSENT
+A1       | 2024-01-05  | 2024-01-06  | PRESENT
+A1       | 2024-01-07  | 2024-01-09  | ABSENT
+A1       | 2024-01-10  | 2024-01-10  | PRESENT
+A2       | 2024-01-06  | 2024-01-07  | PRESENT
+A2       | 2024-01-08  | 2024-01-08  | ABSENT
+A2       | 2024-01-09  | 2024-01-09  | PRESENT
+A2       | 2024-01-10  | 2024-01-10  | ABSENT
+
+*/
+
+with cte as (select 
+	EmployeeID,
+	Date,
+	Status, 
+ 	date - CAST(ROW_NUMBER() OVER (ORDER BY date) AS INT) AS diff
+from EmployeeAttendance)
+select 
+	EmployeeID, 
+	Status, 
+	diff, 
+	date,
+	row_number() over(partition by EmployeeID, Status order by date)
+from cte
+-- group by EmployeeID, Status, diff
+-- order by 3 desc
+
+
+
+-- SELECT 
+--     EmployeeID,
+--     STRING_AGG(Date::text, ', ') AS Dates,
+--     Status
+-- FROM 
+--     EmployeeAttendance
+-- GROUP BY 
+--     EmployeeID, 
+--     Status;