is used, we only need one SQL statement to solve the problem, as shown below:
SELECT std_id,Case when count (*) = 1 -- select only the students of one courseThen max (class_id)Else max (case when main_class_flg = 'y'THEN class_idELSE NULL END)End as main_classFROM StudentclassGroup by std_id;Running result
STD_ID MAIN_class----------------100 1200 3300 4400 5500 6By embedding Case functions in Case functions and using Case functions in aggregate func
to solve the problem, as shown below:Code
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->SELECT std_id,Case when count (*) = 1 -- select only the students of one courseThen max (class_id)Else max (case when main_class_flg = 'y'THEN class_idELSE NULL END)End as main_classFROM StudentclassGroup by std_id;Running result
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->STD_ID MA
. Inc. php3.
$ Worker servers ArrayPhpMyAdmin supports managing multiple mysql-servers from version 1.4.2. Therefore, the $ login servers array is added to store login information of different servers. $ Incluservers [1] ["host"] contains the Host Name of the first server, $ incluservers [2] ["host"] is the host of the second server, and so on. If you only have one server to manage, you can simply ignore the Host Name of the other $ login servers entry.
$ Incluservers [N] ["Port"] stringThe Port
the examination. Of course, I scored a score for the examination environment.
When I came out, I saw GF waiting at the door ...... Then I saw my score-93 points and 4 errors, which is quite good, similar to my estimation. I didn't feel much excited at the time, probably because it was too natural. The lady at the reception also said it was a high score, and it was nice to hear it. Then I asked about the certification in the future. The next scjd would be ¥3
Measure the ambient temperature around the chip. The output voltage of the temperature sensor is proportional to the temperature. The obtained temperature is measured by ADC.
Inside the chip, the temperature sensor is connected to the ch16 of adc1. If you do not use a sensor, you can set it to the powerdown mode to save power.
Main features:
Temperature measurement range:-45 ~ + 125 degrees Celsius
Temperature Measurement Accuracy: ± 1. 5 degrees Celsius
Procedure:
1. Select adc1 ch1
The original table format is as follows:Class calldate callcount1 2005-8-8 401 2005-8-7 62 2005-8-8 773 2005-8-9 333 2005-8-8 93 2005-8-7 21
Callcount1, callcount2, and callcount3 are calculated by date based on the class values.When no record value for this date is set to 0Merge the data into the following format:Calldate callcount1 callcount2 callcount32005-8-9 0 0 332005-8-8 40 77 92005-8-7 6 0 21
-- Create a test environmentCreate Table T (class varchar (2), calldate datetime, callcount INT)
Original article: http://cyher.net/gnulinux/android/android-driver-jogball
1 OverviewJogball is the first Android phone-The trackball pulley attached to HTC Dream. Through jogball, users can easily perform webpage flip and map flip operations, this method of adding a trackball on a mobile phone can cancel the traditional 4-dimensional navigation key. jogball is not the first such function of HTC. It was implemented as early as HTC 3300 (Dopod P800, t
between full screen and window when playing a DVD using the Totem player.
5. When MultiView is configured in the catalyst control center, no error message is displayed in the terminal window.
6. Enhanced compatibility between ATI Radeon HD 9.04 and Xserver in Ubuntu 4870.
7. ati cal can accurately detect the core and memory frequency of the video card.
In summary, catalyst 9.6 is good, and the Bug of enhanced functions is worth updating. 9.6 The following types of video cards are supported:
ATI
that it was not significantly changed.. Somehow.
2. copy can copy the data in the file (csv) into the database. Of course, the structure and type of the data table must correspond to the file one by one. It is said that the insert performance can be greatly improved.Copy codeThe Code is as follows:COPY 'work _ test' from 'C: \ temp.csv 'with delimiter ',' After using Copy, we found that the insert performance was immediately increased to 30 s, which is equivalent to inserting
. MET_NUI_ALLERGEN to HIS. MET_NUI_ALLERGEN.09:39:33 ERROR OGG-01668 Oracle GoldenGate Delivery for Oracle, repraca. prm: process abending.09:42:33 WARNING OGG-00947 Oracle GoldenGate Manager for Oracle, mgr. prm: Lag for replicat repraca is 00:11:17 (checkpoint updated 00:02:59 agO ).
Logdump find data change information
Logdump 519> sfh___________________________________________________________________Hdr-Ind: E (x45) Partition:. (x04)UndoFlag:. (x00) BeforeAfter: A (x41)RecLength: 396 (x018c)
RecyclerView bug -- Inconsistency detected, recyclerviewHow to reproduce bugs
When RecyclerView and SwipeRefreshLayout are used for pull-down refreshing, if the bound List object is clear before data is updated, then the user will quickly slide the RecyclerView, causing a crash, moreover, exceptions are not reported to our Code and are internal RecyclerView errors.Possible causes
After the list is cleared, the system quickly slides up and the new data has not arrived. As a result, when RecyclerV
simple algorithms directly, and there is too little data. Then we move the question to our own oj, I have some extra data and tested it. The simple algorithm uses 3300 ms, and the kmp uses about ms for reference only. This shows the superiority of the kmp algorithm, I have been reading kmp for a long time in the last two days. I feel that some details are not in place. I still need to review and understand more. I want to see the details of the kmp a
an eink e-book, you need to ask yourself the following questions:1. What is the budget?Taking imported brands as an example, the current price watershed is that most 6-inch screen products are priced at less than $300, or less than RMB 2500 in China; most 8-inch screen products are priced at more than 400 US dollars, and more than 3300 in China. You can pay for the silver in your pocket first.Currently, the 6-inch screen of Chinese brands is the main
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