统计每个国家、每种设备的注册用户数，做成交叉表。
ios、android、web 三列，值为人数。country 或 device 为 null 的用户不计入；只输出至少有一个计入用户的国家。输入
users(user_id, signup_ts, country, device)输出
列为 country, ios, android, web，行顺序、列顺序不限。
users web/users
| # | user_idint64 | signup_tsdatetime | countrystring | devicestring |
|---|---|---|---|---|
| 1 | 1 | 2026-06-24 03:08:20 | CN | web |
| 2 | 2 | 2026-06-20 22:19:20 | DE | web |
| 3 | 3 | 2026-09-17 01:45:10 | US | android |
| 4 | 4 | 2026-09-04 07:46:49 | JP | android |
| 5 | 5 | 2026-07-17 14:10:25 | CN | ios |
| 6 | 6 | 2026-07-26 18:38:11 | JP | android |
| 7 | 7 | 2026-09-04 04:54:06 | JP | ios |
| 8 | 8 | 2026-07-19 20:08:09 | CN | web |
| 9 | 9 | 2026-08-09 06:02:40 | JP | web |
| 10 | 10 | 2026-09-08 17:29:29 | US | android |
| 11 | 11 | 2026-06-18 09:52:08 | US | ios |
| 12 | 12 | 2026-08-28 19:51:40 | CN | android |
| 13 | 13 | 2026-09-21 02:59:16 | CN | web |
| 14 | 14 | 2026-08-11 14:56:25 | CN | android |
| 15 | 15 | 2026-08-17 10:25:06 | DE | android |
| 16 | 16 | 2026-06-23 14:41:12 | US | web |
| 17 | 17 | 2026-09-04 08:22:08 | CN | android |
| 18 | 18 | 2026-08-21 13:11:02 | US | web |
| 19 | 19 | 2026-09-08 14:31:03 | US | ios |
| 20 | 20 | 2026-07-14 14:21:42 | JP | web |
| # | countryString | iosInt64 | androidInt64 | webInt64 |
|---|---|---|---|---|
| 1 | JP | 2 | 6 | 5 |
| 2 | BR | 2 | 3 | 2 |
| 3 | CN | 4 | 10 | 6 |
| 4 | DE | 2 | 1 | 1 |
| 5 | US | 5 | 8 | 3 |