在 MySQL 中，我们如何通过提供年份、周数和星期几来计算日期？

mysql> SET @year=两017, @week=15, @day=4;
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT Str_To_Date( Concat(@year,'-',@week,'-',If(@day=7,0,@day) ), '%Y-%U-%w' ) AS Date;
+--------------+
| Date         |
+--------------+
| 二017-04-13   |
+--------------+
1 row in set (0.00 sec)