Upload 129

Author: ggeerraarrdd

README.md

@@ -163,6 +163,7 @@ To make the daily tasks of creating a new file and updating the index easier, th
 | 126   | [Triangle Judgement](https://leetcode.com/problems/triangle-judgement/description/)                                                                           | [Solution](solutions/126_triangle_judgement.md)                                       | LeetCode    | Easy         | Triangle Inequality Theorem                                         |
 | 127   | [Consecutive Numbers](https://leetcode.com/problems/consecutive-numbers/description/)                                                                         | [Solution](solutions/127_consecutive_numbers.md)                                      | LeetCode    | Medium       |                                                                     |
 | 128   | [Last Person to Fit in the Bus](https://leetcode.com/problems/last-person-to-fit-in-the-bus/description/)                                                     | [Solution](solutions/128_last_person_to_fit_in_the_bus.md)                            | LeetCode    | Medium       | `ORDER BY turn RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW`   |
+| 129   | [Count Salary Categories](https://leetcode.com/problems/count-salary-categories/description/)                                                                 | [Solution](solutions/129_count_salary_categories.md)                                  | LeetCode    | Medium       | `IFNULL`                                                            |
 <!-- Index End - WARNING: Do not delete or modify this markdown comment. -->
 
 ## Author(s)

eevveerryyddaayy.ipynb

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  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "application/vnd.jupyter.widget-view+json": {
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-      "text/plain": [
-       "VBox(children=(VBox(children=(HTML(value='<span style=\"font-size:20px;\"><b>EEVVEERRYYDDAAYY</b></span>', layou…"
-      ]
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-     "metadata": {},
-     "output_type": "display_data"
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Processing...\n",
-      "Done\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "\"\"\"\n",
     "Run this cell to display the form interface.\n",

solutions/129_count_salary_categories.md

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+# SQL Everyday \#129
+
+## Count Salary Categories
+
+Site: LeetCode\
+Difficulty per Site: Medium
+
+## Problem
+
+Write a solution to calculate the number of bank accounts for each salary category. [[Full Description](https://leetcode.com/problems/count-salary-categories/description/)]
+
+## Submitted Solution
+
+```sql
+-- Submitted Solution
+SELECT
+    "Low Salary" AS category
+    ,IFNULL(COUNT(account_id), 0) AS accounts_count
+FROM Accounts
+WHERE income < 20000
+UNION
+SELECT
+    "Average Salary" AS category
+    ,IFNULL(COUNT(account_id), 0) AS accounts_count
+FROM Accounts
+WHERE income >= 20000 AND income <= 50000
+UNION
+SELECT
+    "High Salary" AS category
+    ,IFNULL(COUNT(account_id), 0) AS accounts_count
+FROM Accounts
+WHERE income > 50000
+;
+```
+
+## Site Solution
+
+```sql
+-- LeetCode Solution 
+-- TBD
+```
+
+## Notes
+
+TBD
+
+## NB
+
+`IFNULL`
+
+Go to [Table of Contents](/README.md#contents)\
+Go to [Overview](/README.md)