Sure, let's go through a detailed step-by-step solution to determine the total playtime for each artist and then order them in descending order.
### Example Data Provided:
1. song_play_history Table
```
+---------+-----------+
| SONG_ID | PLAY_TIME |
+---------+-----------+
| S1 | 100 |
| S2 | 130 |
+---------+-----------+
```
2. songs Table
```
+---------+-----------+
| SONG_ID | ARTIST_ID |
+---------+-----------+
| S1 | A2 |
| S2 | A6 |
+---------+-----------+
```
### Step-by-Step Solution:
1. Identify the Play Times:
- From the `song_play_history` table:
- Song S1 was played for 100 seconds.
- Song S2 was played for 130 seconds.
2. Identify the Mapping of Songs to Artists:
- From the `songs` table:
- Song S1 is associated with Artist A2.
- Song S2 is associated with Artist A6.
3. Calculate Total Play Times Per Artist:
- For Artist A2:
- Only Song S1 is associated, which was played for 100 seconds.
- Total play time for Artist A2 = 100 seconds.
- For Artist A6:
- Only Song S2 is associated, which was played for 130 seconds.
- Total play time for Artist A6 = 130 seconds.
4. Prepare the Resulting Data:
- After summing up the playtimes, we get:
- Artist A2 has 100 seconds of total play time.
- Artist A6 has 130 seconds of total play time.
5. Sort the Results in Descending Order of Play Time:
- Comparing the total play times:
- Artist A6 with 130 seconds comes before Artist A2 with 100 seconds.
### Final Ordered Output:
```
+-----------+----------------+
| ARTIST_ID | TOTAL_PLAY_TIME|
+-----------+----------------+
| A6 | 130 |
| A2 | 100 |
+-----------+----------------+
```
Hence, the artists ordered by their total playtime in descending order are:
1. Artist A6 with a total playtime of 130 seconds.
2. Artist A2 with a total playtime of 100 seconds.
