这个用户学了几条路线
按用户编号筛一次:
这个用户一共学了几条路线?
mysql> SELECT path_code, progress FROM learning_record WHERE user_id = 101;
+-------------+----------+
| path_code | progress |
+-------------+----------+
| l1_basic_01 | 100 |
| l1_lang_01 | 60 |
| l1_os_01 | 20 |
+-------------+----------+
mysql>
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