Align existing files with new content structure of template file

Author: ggeerraarrdd

solutions/001_histogram_of_tweets.md

@@ -9,7 +9,7 @@ Difficulty per Site: Easy
 
 Assume you're given a table Twitter tweet data, write a query to obtain a histogram of tweets posted per user in 2022. Output the tweet count per user as the bucket and the number of Twitter users who fall into that bucket. In other words, group the users by the number of tweets they posted in 2022 and count the number of users in each group. [[Full Description](https://datalemur.com/questions/sql-histogram-tweets)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 WITH cte AS (
@@ -28,9 +28,19 @@ GROUP BY count
 ;
 ```
 
+## Site Solution
+
+```sql
+-- TBD
+```
+
 ## Notes
 
 TODO
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/002_users_third_transaction.md

@@ -9,7 +9,7 @@ Difficulty per Site: Medium
 
 Write a query to obtain the third transaction of every user. Output the user id, spend and transaction date. [[Full Description](https://datalemur.com/questions/sql-third-transaction)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 WITH cte AS (
@@ -29,9 +29,19 @@ WHERE transaction = 3
 ;
 ```
 
+## Site Solution
+
+```sql
+-- TBD
+```
+
 ## Notes
 
 TODO
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/003_second_highest_salary.md

@@ -9,7 +9,7 @@ Difficulty per Site: Medium
 
 Your manager is keen on understanding the pay distribution and asks you to determine the second highest salary among all employees. It's possible that multiple employees may share the same second highest salary. In case of duplicate, display the salary only once. [[Full Description](https://datalemur.com/questions/sql-second-highest-salary)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 -- Submitted Solution
@@ -26,7 +26,11 @@ FROM cte
 WHERE rank = 2
 LIMIT 1
 ;
+```
+
+## Site Solution
 
+```sql
 -- DataLemur Solution
 SELECT MAX(salary) AS second_highest_salary
 FROM employee
@@ -40,5 +44,9 @@ WHERE salary < (
 
 TODO
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/004_sending_vs_opening_snaps.md

@@ -9,7 +9,7 @@ Difficulty per Site: Medium
 
 Write a query to obtain a breakdown of the time spent sending vs. opening snaps as a percentage of total time spent on these activities grouped by age group. Round the percentage to 2 decimal places in the output. [[Full Description](https://datalemur.com/questions/time-spent-snaps)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 -- Submitted Solution
@@ -61,7 +61,11 @@ SELECT
 FROM cte4
 JOIN cte5 ON cte4.age_bucket = cte5.age_bucket
 ;
+```
+
+## Site Solution
 
+```sql
 -- DataLemur Solution
 SELECT 
   age.age_bucket, 
@@ -82,5 +86,9 @@ GROUP BY age.age_bucket;
 
 * One of the reasons I started this personal SQL Everyday chellenge is to learn SQL concepts and techniques new to me. This problem delivered with [`FILTER()`](https://www.postgresql.org/docs/current/sql-expressions.html#SYNTAX-AGGREGATES) from DataLemur's solutions. The reduction of lines from my query to that solution is remarkable.
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/005_highest-grossing_items.md

@@ -9,7 +9,7 @@ Difficulty per Site: Medium
 
 Write a query to obtain a breakdown of the time spent sending vs. opening snaps as a percentage of total time spent on these activities grouped by age group. Round the percentage to 2 decimal places in the output. [[Full Description](https://datalemur.com/questions/time-spent-snaps)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 -- Submitted Solution
@@ -39,7 +39,11 @@ FROM cte2
 WHERE cat_rank < 3
 ORDER BY category, cat_rank
 ;
+```
+
+## Site Solution
 
+```sql
 -- DataLemur Solution
 WITH ranked_spending_cte AS (
   SELECT 
@@ -66,5 +70,9 @@ ORDER BY category, ranking;
 * The key is knowing the difference between [`RANK()` and `DENSE_RANK`](https://www.google.com/search?q=rank()+vs+dense_rank()).
 * New to me: You can use an aggregate function in the `OVER()` clause of window function. This would have eliminated one CTE in my submitted solution.
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/006_top_three_salaries.md

@@ -11,7 +11,7 @@ As part of an ongoing analysis of salary distribution within the company, your m
 
 You're tasked with identifying these high earners across all departments. Write a query to display the employee's name along with their department name and salary. In case of duplicates, sort the results of department name in ascending order, then by salary in descending order. If multiple employees have the same salary, then order them alphabetically. [[Full Description](https://datalemur.com/questions/sql-top-three-salaries)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 -- Submitted Solution
@@ -34,9 +34,19 @@ ORDER BY department_name ASC, salary DESC, name ASC
 ;
 ```
 
+## Site Solution
+
+```sql
+-- TBD
+```
+
 ## Notes
 
 TODO
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/007_top_5_artists.md

@@ -9,7 +9,7 @@ Difficulty per Site: Medium
 
 Write a query to find the top 5 artists whose songs appear most frequently in the Top 10 of the global_song_rank table. Display the top 5 artist names in ascending order, along with their song appearance ranking. If two or more artists have the same number of song appearances, they should be assigned the same ranking, and the rank numbers should be continuous (i.e. 1, 2, 2, 3, 4, 5). [[Full Description](https://datalemur.com/questions/top-fans-rank)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 -- Submitted Solution
@@ -31,9 +31,19 @@ WHERE artist_rank <= 5
 ;
 ```
 
+## Site Solution
+
+```sql
+-- TBD
+```
+
 ## Notes
 
 TODO
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/008_signup_activation_rate.md

@@ -9,7 +9,7 @@ Difficulty per Site: Medium
 
 New TikTok users sign up with their emails. They confirmed their signup by replying to the text confirmation to activate their accounts. Users may receive multiple text messages for account confirmation until they have confirmed their new account. A senior analyst is interested to know the activation rate of specified users in the emails table. Write a query to find the activation rate. Round the percentage to 2 decimal places. [[Full Description](https://datalemur.com/questions/signup-confirmation-rate)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 -- Submitted Solution
@@ -24,18 +24,26 @@ SELECT
   ROUND(confirmed / (confirmed + not_confirmed), 2) AS confirm_rate
 FROM cte
 ;
+```
+
+## Site Solution
 
+```sql
 -- DataLemur Solution
 SELECT 
   ROUND(COUNT(texts.email_id)::DECIMAL / COUNT(DISTINCT emails.email_id), 2) AS activation_rate
 FROM emails
 LEFT JOIN texts ON emails.email_id = texts.email_id AND texts.signup_action = 'Confirmed'
-;  
+; 
 ```
 
 ## Notes
 
 * The key to getting the right result is casting the values as decimal, otherwise you'll get `0`.
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/009_supercloud_customer.md

@@ -9,7 +9,7 @@ Difficulty per Site: Medium
 
 A Microsoft Azure Supercloud customer is defined as a customer who has purchased at least one product from every product category listed in the products table. Write a query that identifies the customer IDs of these Supercloud customers. [[Full Description](https://datalemur.com/questions/supercloud-customer)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 -- Submitted Solution
@@ -28,9 +28,19 @@ WHERE ranking = (SELECT COUNT(DISTINCT product_category) FROM products)
 ;
 ```
 
+## Site Solution
+
+```sql
+-- TBD
+```
+
 ## Notes
 
 TODO
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)

solutions/010_odd_and_even_measurements.md

@@ -15,7 +15,7 @@ Definition:
 
 Within a day, measurements taken at 1st, 3rd, and 5th times are considered odd-numbered measurements, and measurements taken at 2nd, 4th, and 6th times are considered even-numbered measurements. [[Full Description](https://datalemur.com/questions/odd-even-measurements)]
 
-## Solution
+## Submitted Solution
 
 ```sql
 -- Submitted Solution
@@ -41,7 +41,11 @@ FROM cte2
 GROUP BY time_day
 ORDER BY time_day
 ;
+```
+
+## Site Solution
 
+```sql
 -- DataLemur Solution
 WITH ranked_measurements AS (
   SELECT 
@@ -66,5 +70,9 @@ GROUP BY measurement_day;
 * DataLemur was able to use one less CTE by using `FILTER`.
 * Another difference is the use of `MOD()` vs a `%` arithmatic operator.
 
+## NB
+
+TBD
+
 Go to [Table of Contents](/README.md#contents)\
 Go to [Overview](/README.md)