[86022.030544] usb 4-2: new SuperSpeed USB device number 2 using xhci_hcd [86032.041106] usb 4-2: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[86032.041110] usb 4-2: Product
Jul 9 09:09:56 me kernel: [ 2740.896079] usb 4-2: new full-speed USB device number 4 using uhci_hcdJul 9 09:09:57 me kernel: [ 2741.080112] usb 4-2: New USB device found, idVendor=046d, idProduct=c52fJul 9 09:09:57 me kernel: [ 2741.080118] usb 4-2: New USB device strin
.[147333.530241] usb 4-2: new SuperSpeed] usb 4-2: Product: VLI Product String
[147333.554422] usb 4-2: Manufacturer: VLI manufacture String[147333.554426] usb 4-2: SerialNumber: 00000000
USB3.0 -蓝色/5 SW/SWBus 004 Device 005: ID 054c:09c2 Sony Corp.[ 241.322233] usb 4-2: new SuperSpeed USB device number 4 using xhci_hcd[ 241.435830] usb 4-2: New US
我有两张表:景点和城市。Attractions包含一个名为city的列,它引用了cities表中的id。我想形成一个MySQL语句,告诉我哪些城市最吸引人。我知道我能做到: FROM `attractions` ...to获取一个城市中有多少个景点的计数,但是有没有一条语句可以计数每个城市中的所有景点,并按景点数量降序返回结果?