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Author: thecoddiwompler

Price on a given Date/README.md

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+# Price on a given Date
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+
+---
+
+
+## 🛠️ Problem Statement
+
+  <b>Table Name : sku</b>
+
+|  Column Name  |Type |
+| ------------- | ------------- |
+| sku_id  | INT  |
+| price_date  | DATE  |
+| price | INT |
+
+<b>sku_id, price_date is the primary key of this table.</b>
+</br>
+
+You are given the price of each sku whenever there is a change in price.
+
+</br>
+  
+Write an SQL to find the price at the start of each month. Refer to the Example Output below for the desired format.
+
+</br>
+
+The query result format is in the following example. 
+
+ <details>
+<summary>
+Input
+</summary>
+</br>
+
+<b> Table Name: sku </b></br>
+
+| sku_id | price_date  | price |
+|--------|-------------|-------|
+| 1      | 2023-01-01  | 10    |
+| 1      | 2023-02-15  | 15    |
+| 1      | 2023-03-03  | 18    |
+| 1      | 2023-03-27  | 15    |
+| 1      | 2023-04-06  | 20    |
+
+
+
+</details>
+
+<details>
+<summary>
+Output
+</summary>
+</br>
+
+| sku_id | month_start_date | price |
+|--------|-------------------|-------|
+| 1      | 2023-01-01        | 10    |
+| 1      | 2023-02-01        | 10    |
+| 1      | 2023-03-01        | 15    |
+| 1      | 2023-04-01        | 15    |
+| 1      | 2023-05-01        | 20    |
+
+
+</details>
+
+---

Price on a given Date/schema.sql

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+CREATE TABLE sku (sku_id int, price_date date, price int);
+
+INSERT INTO
+    sku
+VALUES
+    (1, '2023-01-01', 10),
+    (1, '2023-02-15', 15),
+    (1, '2023-03-03', 18),
+    (1, '2023-03-27', 15),
+    (1, '2023-04-06', 20);
+
+COMMIT;

Price on a given Date/solution.sql

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+WITH cte AS (
+    SELECT
+        DISTINCT date_trunc('Month', price_date) month_start_date
+    FROM
+        sku
+    UNION
+    SELECT
+        date_trunc('Month', MAX(price_date)) + INTERVAL '1' MONTH
+    FROM
+        sku
+),
+sol AS (
+    SELECT
+        b.sku_id,
+        a.month_start_date,
+        b.price_date,
+        b.price
+    FROM
+        cte a
+        INNER JOIN sku b ON a.month_start_date >= b.price_date
+),
+ans AS (
+    SELECT
+        sku_id,
+        month_start_date,
+        MAX(price_date) target_date
+    FROM
+        sol
+    GROUP BY
+        sku_id,
+        month_start_date
+)
+SELECT
+    a.sku_id,
+    TO_CHAR(a.month_start_date, 'YYYY-MM-DD') month_start_date,
+    a.price
+FROM
+    sol a
+    INNER JOIN ans b ON a.sku_id = b.sku_id
+    AND a.month_start_date = b.month_start_date
+    AND a.price_date = b.target_date;