✏️ fix: correct supply chain network sales and add data solution

docs/challenging-sql-problems/problems/gold/supply-chain-network.md

@@ -59,7 +59,7 @@ The solution can be found at:
 
 - [supply-chain-network.md](../../solutions/gold/supply-chain-network.md)
 
-A worked example is provided below to help illustrate the "shuffling" within the locations.
+A worked example is provided below to help illustrate the stock movement within the locations.
 
 ---
 

docs/challenging-sql-problems/problems/gold/supply-chain-network.sql

@@ -67,22 +67,22 @@ values
     ('2024-01-02 07:12:21'::timestamp, 6, 1001,  2),
     ('2024-01-02 09:51:01'::timestamp, 7, 1001,  4),
     ('2024-01-02 10:55:42'::timestamp, 8, 1001,  9),
-    ('2024-01-02 11:21:10'::timestamp, 7, 1001, 19),
-    ('2024-01-02 15:02:20'::timestamp, 7, 1001,  1),
-    ('2024-01-02 16:18:00'::timestamp, 7, 1001,  1),
-    ('2024-01-02 18:47:13'::timestamp, 7, 1001,  9),
+    ('2024-01-02 11:21:10'::timestamp, 6, 1001, 19),
+    ('2024-01-02 15:02:20'::timestamp, 6, 1001,  1),
+    ('2024-01-02 16:18:00'::timestamp, 6, 1001,  1),
+    ('2024-01-02 18:47:13'::timestamp, 6, 1001,  9),
     ('2024-01-02 19:15:12'::timestamp, 8, 1001,  5),
     ('2024-01-02 20:38:01'::timestamp, 6, 1001, 14),
-    ('2024-01-03 07:00:27'::timestamp, 7, 1001, 13),
+    ('2024-01-03 07:00:27'::timestamp, 6, 1001,  3),
     ('2024-01-03 08:56:40'::timestamp, 6, 1001,  1),
-    ('2024-01-03 09:40:07'::timestamp, 6, 1001, 14),
+    ('2024-01-03 09:40:07'::timestamp, 6, 1001,  4),
     ('2024-01-03 10:21:06'::timestamp, 7, 1001,  4),
-    ('2024-01-03 12:31:10'::timestamp, 6, 1001, 10),
+    ('2024-01-03 12:31:10'::timestamp, 7, 1001,  6),
     ('2024-01-03 15:56:56'::timestamp, 8, 1001,  5),
     ('2024-01-03 17:49:04'::timestamp, 7, 1001, 12),
-    ('2024-01-03 18:02:34'::timestamp, 6, 1001,  1),
+    ('2024-01-03 18:02:34'::timestamp, 6, 1001, 12),
     ('2024-01-03 20:19:42'::timestamp, 7, 1001,  7),
-    ('2024-01-03 20:28:00'::timestamp, 6, 1001,  8),
+    ('2024-01-03 20:28:00'::timestamp, 8, 1001, 15),
     ('2024-01-04 13:07:02'::timestamp, 7, 1001, 24),
     ('2024-01-04 14:03:39'::timestamp, 8, 1001, 16)
 ;

docs/challenging-sql-problems/solutions/gold/supply-chain-network.md

@@ -10,7 +10,32 @@
 
 Regardless of the database, the result set should look like:
 
-(to be added)
+| stock_date | store_id | supplier_id | stock_volume | stock_proportion |
+| :--------- | -------: | ----------: | -----------: | ---------------: |
+| 2024-01-01 |        6 |           1 |            0 |             0.00 |
+| 2024-01-01 |        6 |           2 |           10 |           100.00 |
+| 2024-01-01 |        7 |           1 |            0 |             0.00 |
+| 2024-01-01 |        7 |           2 |            0 |             0.00 |
+| 2024-01-01 |        8 |           1 |            0 |             0.00 |
+| 2024-01-01 |        8 |           2 |            0 |             0.00 |
+| 2024-01-02 |        6 |           1 |            0 |             0.00 |
+| 2024-01-02 |        6 |           2 |            9 |           100.00 |
+| 2024-01-02 |        7 |           1 |            6 |            54.55 |
+| 2024-01-02 |        7 |           2 |            5 |            45.45 |
+| 2024-01-02 |        8 |           1 |            0 |             0.00 |
+| 2024-01-02 |        8 |           2 |            1 |           100.00 |
+| 2024-01-03 |        6 |           1 |           14 |            41.18 |
+| 2024-01-03 |        6 |           2 |           20 |            58.82 |
+| 2024-01-03 |        7 |           1 |            0 |             0.00 |
+| 2024-01-03 |        7 |           2 |            2 |           100.00 |
+| 2024-01-03 |        8 |           1 |            1 |             6.25 |
+| 2024-01-03 |        8 |           2 |           15 |            93.75 |
+| 2024-01-04 |        6 |           1 |           34 |            57.63 |
+| 2024-01-04 |        6 |           2 |           25 |            42.37 |
+| 2024-01-04 |        7 |           1 |            3 |           100.00 |
+| 2024-01-04 |        7 |           2 |            0 |             0.00 |
+| 2024-01-04 |        8 |           1 |           15 |           100.00 |
+| 2024-01-04 |        8 |           2 |            0 |             0.00 |
 
 <details>
 <summary>Expand for the DDL</summary>

docs/challenging-sql-problems/solutions/gold/supply-chain-network.sql

@@ -0,0 +1,29 @@
+```sql
+solution(stock_date, store_id, supplier_id, stock_volume, stock_proportion) as (
+    values
+        ('2024-01-01'::date, 6, 1,  0,   0.00),
+        ('2024-01-01'::date, 6, 2, 10, 100.00),
+        ('2024-01-01'::date, 7, 1,  0,   0.00),
+        ('2024-01-01'::date, 7, 2,  0,   0.00),
+        ('2024-01-01'::date, 8, 1,  0,   0.00),
+        ('2024-01-01'::date, 8, 2,  0,   0.00),
+        ('2024-01-02'::date, 6, 1,  0,   0.00),
+        ('2024-01-02'::date, 6, 2,  9, 100.00),
+        ('2024-01-02'::date, 7, 1,  6,  54.55),
+        ('2024-01-02'::date, 7, 2,  5,  45.45),
+        ('2024-01-02'::date, 8, 1,  0,   0.00),
+        ('2024-01-02'::date, 8, 2,  1, 100.00),
+        ('2024-01-03'::date, 6, 1, 14,  41.18),
+        ('2024-01-03'::date, 6, 2, 20,  58.82),
+        ('2024-01-03'::date, 7, 1,  0,   0.00),
+        ('2024-01-03'::date, 7, 2,  2, 100.00),
+        ('2024-01-03'::date, 8, 1,  1,   6.25),
+        ('2024-01-03'::date, 8, 2, 15,  93.75),
+        ('2024-01-04'::date, 6, 1, 34,  57.63),
+        ('2024-01-04'::date, 6, 2, 25,  42.37),
+        ('2024-01-04'::date, 7, 1,  3, 100.00),
+        ('2024-01-04'::date, 7, 2,  0,   0.00),
+        ('2024-01-04'::date, 8, 1, 15, 100.00),
+        ('2024-01-04'::date, 8, 2,  0,   0.00)
+)
+```