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basics.txt
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basics.txt
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-------------------- BEGIN basics.txt --------------------
# Team: AI-Books
# Date: 26/06/2021
# Database name: "BX-Books_hkv1.db", "BX-Ratings_hkv1.db", "BX-Users_hkv1.db"
3.a) how many users? 278858
3.b) how many books? 270551
3.c) how many ratings? 431608
3.d) histogram of user-ratings <table(num ratings, num users)> (how many users have rated N times? 10)
+-----+-------+
| bin | N |
+-----+-------+
| 1 | 13549 |
| 2 | 7521 |
| 3 | 6095 |
| 4 | 5876 |
| 5 | 5828 |
| 6 | 4766 |
| 7 | 4510 |
| 8 | 3356 |
...
3.e) histogram of book-ratings <table(num ratings, num users)> (how many books have been rated N times? 7)
+-----+-------+
| bin | N |
+-----+-------+
| 1 | 2502 |
| 2 | 1295 |
| 3 | 883 |
| 4 | 732 |
| 5 | 723 |
| 6 | 647 |
| 7 | 639 |
| 8 | 615 |
...
3.f) top-10 rated books? <table(name,num ratings)>
+----------+-------+
| name | N |
+----------+-------+
|0971880107| 2502 |
|0316666343| 1295 |
|0385504209| 883 |
|0060928336| 732 |
|0312195516| 723 |
|044023722X| 647 |
|0679781587| 639 |
|0142001740| 615 |
|067976402X| 614 |
|0671027360| 586 |
...
3.g) top-10 active users? <table(name, num ratings)>
+-------+-------+
| name | N |
+-------+-------+
| 11676|13549 |
| 198711| 7521 |
| 153662| 6095 |
| 98391| 5876 |
| 35859| 5828 |
| 212898| 4766 |
| 278418| 4510 |
| 76352| 3356 |
| 110973| 3090 |
| 235105| 3056 |
...
-------------------- END basics.txt --------------------