我有3张桌子，目标是将在“京都厅”举办的所有“普拉提”和“哈萨”课程的ClassPrice提高10％。
**YogaRooms**
RoomNum | RoomName | RoomCapacity | Branch | CostPerHour
--------------------------------------------------------------------
001 | Surya Room | 20 | Sydney | 100.00
002 | Chandra Room | 10 | North Sydney | 50.00
003 | Ashtanga Room | 25 | North Sydney | 150.00
004 | Yin Room | 15 | Sydney | 70.00
005 | Kyoto Room | 30 | Sydney | 130.00
--------------------------------------------------------------------
**YogaTimeTable**
YogaId | StartTime | Day | RoomNum | Instructor | Duration
-------------------------------------------------------------
DRU | 10.30 | Wed | 001 | Mark | 60.00
DRU | 17.00 | Tue | 002 | Julie | 90.00
HAT | 18.30 | Mon | 004 | Cora | 60.00
HAT | 7.30 | Tue | 004 | Mark | 90.00
PIL | 17.00 | Thu | 004 | Julie | 60.00
PIL | 18.30 | Wed | 003 | Nicky | 120.00
SUN | 7.30 | Mon | 003 | Mark | 60.00
HAT | 18.30 | Mon | 005 | Cora | 60.00
HAT | 7.30 | Tue | 005 | Mark | 90.00
PIL | 17.00 | Thu | 005 | Julie | 60.00
-------------------------------------------------------------
**YogaTypes**
YogaId | YogaName | ClassPrice
-------------------------------
BHA | Bhakti | 17.00
DRU | Dru | 18.50
HAT | Hatha | 20.00
PIL | Pilates | 15.50
SUN | Sunrise | 15.00
--------------------------------
我已经尝试过将此代码并将其更改为不同的变体，但是它不起作用。它更新了所有“普拉提”和“哈萨”课程的价格，但不仅针对“京都厅”。请我帮忙。
UPDATE YogaTypes
SET ClassPrice = ClassPrice * 1.1
WHERE YogaId IN (select T.YogaId
from YogaRooms R, YogaTimeTable T, YogaTypes YT
where R.RoomNum = T.RoomNum
and YT.YogaId = T.YogaId
and R.RoomNum = '005')
答案 0 :(得分：1)
使用join：
UPDATE YogaTypes yt JOIN
YogaTimeTable ytt
ON yt.YogaId = ytt.YogaId
SET yt.ClassPrice = yt.ClassPrice * 1.1
WHERE yt.YogaName in ('Pilates', 'Hatha') AND
ytt.RoomNum = '005';