Upload 165

Author: ggeerraarrdd

README.md

@@ -1,6 +1,6 @@
 <!-- markdownlint-disable MD041 -->
 [![eevveerryyddaayy release](https://img.shields.io/badge/eevveerryyddaayy-v1.3.0-blue.svg)](https://github.com/ggeerraarrdd/eevveerryyddaayy/)
-[![Solved](https://img.shields.io/badge/solved-164-green.svg)](#index)
+[![Solved](https://img.shields.io/badge/solved-165-green.svg)](#index)
 <!-- markdownlint-enable MD041 -->
 
 # SQL Everyday
@@ -198,6 +198,7 @@ Because this project necessitated a framework to enable consistent daily practic
 | 162   | [Find Products with Valid Serial Numbers](https://leetcode.com/problems/find-products-with-valid-serial-numbers/description/)                                     | [Solution](solutions/162_find_products_with_valid_serial_numbers.md)                    | LeetCode    | Easy         | Regex                                                               |
 | 163   | [DNA Pattern Recognition](https://leetcode.com/problems/dna-pattern-recognition/description/)                                                                     | [Solution](solutions/163_dna_pattern_recognition_.md)                                   | LeetCode    | Easy         |                                                                     |
 | 164   | [Even or Odd](https://www.codewars.com/kata/53da3dbb4a5168369a0000fe/sql)                                                                                         | [Solution](solutions/164_even_or_odd.md)                                                | Codewars    | Easy         |                                                                     |
+| 165   | [Daily Hospital Admissions and Discharges Report](https://www.codewars.com/kata/66b09bedf5ca866d7ffafc8f)                                                         | [Solution](solutions/165_daily_hospital_admissions_and_discharges_report.md)            | Codewars    | Medium       | `TO_CHAR()`                                                         |
 <!-- Index End - WARNING: Do not delete or modify this markdown comment. -->
 <!--- cSpell:enable --->
 

solutions/165_daily_hospital_admissions_and_discharges_report.md

@@ -0,0 +1,62 @@
+# SQL Everyday \#165
+
+## Daily Hospital Admissions and Discharges Report
+
+Site: Codewars\
+Difficulty per Site: Medium
+
+## Problem
+
+Write a SQL query to generate a daily report that includes the number of admissions, the number of discharges, the net change in patient count for each day, and the cumulative net change over time. [[Full Description](https://www.codewars.com/kata/66b09bedf5ca866d7ffafc8f)]
+
+## Submitted Solution
+
+```sql
+-- Submitted Solution
+WITH joins AS (
+  SELECT
+    TO_CHAR(join_date, 'YYYY-MM-DD') AS j_date
+    ,COUNT(entry_id) AS joins
+  FROM admissions
+  GROUP BY j_date
+),
+exits AS (
+  SELECT
+    TO_CHAR(exit_date, 'YYYY-MM-DD') AS e_date
+    ,COUNT(entry_id) AS exits
+  FROM exits
+  GROUP BY e_date
+),
+net AS (
+  SELECT
+    COALESCE(j_date, e_date) AS "date"
+    ,COALESCE(joins, 0) AS joins
+    ,COALESCE(exits, 0) AS exits
+    ,CAST(COALESCE(joins, 0) - COALESCE(exits, 0) AS INT) AS net
+  FROM joins AS j
+  FULL JOIN exits AS e ON j.j_date = e.e_date
+)
+SELECT
+  *
+  ,SUM(net) OVER(ORDER BY "date" ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS cumulative_net
+FROM net
+;
+```
+
+## Site Solution
+
+```sql
+-- Codewars Solution 
+-- TBD
+```
+
+## Notes
+
+TBD
+
+## NB
+
+`TO_CHAR()`
+
+Go to [Index](../?tab=readme-ov-file#index)\
+Go to [Overview](../?tab=readme-ov-file)