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• What is the difference between Count (*) and Count (1)?

  Hello

  can you please what is the difference between Count (*) and Count (1)?

  I saw that Count (*), Count (1), Count (2)... etc return values from a table. Is there an exact difference between them?

  Have you read the forum space FAQ? I'm sure that you don't have because it is answered there.

  It is also answered via Google.

  The short answer is: there is no difference, unless you use count (1), count (2), etc. instead of count (*) it makes you look like an amateur.

• DIFFERENCE BETWEEN count (*) and Count (1)

  If this link means

  https://jonathanlewis.WordPress.com/2015/01/06/count-4/

  It works the same way

  Summary: -.

  https://www.LinkedIn.com/groups/4251681/4251681-6057436339962474497

  Yes, he does.  As Jonathan, Oracle rewrites internal count (1) by count (*) in recent versions.

  In general, I suggest using count (*), since that's what Oracle prefer of course (it rewrites the other requests to make a count (*) if possible).

  Justin

• Difference between count (*) & count (1)

  Jin
  I want to know the difference between count and count (*) (1).
  Which is effective and why.

  Hello

  There is no difference between COUNT (*) and the NUMBER (1). They return the same results and are just as effective.

• Search between Dates

  It's confusing, so I'll do my best to explain.
  
  We have an application where employees sign out of the office. They provide it userID, LeaveDate and ReturnDate and it is written in a single record in SQL.
  
  There are also several searches for this data, which is to enter a user name and two dates and return if this user is disconnected between these two dates if the LeaveDate is now between the two search dates.
  
  The problem is that if someone was taken out of the 8 to 15, and a search was made on them for the 11th to the 13th, he would not return anything that either since the (8th) LeaveDate do not fall between the two search dates.
  
  So now, I am loaded with a way to solve this problem. Is there a search between dates and determine whether any date within this range is in the range of dates that the employee is disconnected? Is it possible, when the employee signs, create a record for each date in the span of days they have disappeared? So if someone out of the 10th to the 12th, it would create three different entries.
  
  Any help is appreciated.
  

  > return if this user is disconnected between these two
  > dates if the LeaveDate is between the
  > search two dates

  Start by creating some examples of date that will cover all the possibilities. As

  If the dates of research are:

  Search Start = 11
  End of search = 13

  You want to include these cases

  1 Date1 is before you start to search for... AND. Date2 is between start and end search
  Example: 6 to 13

  2 Date1 is between start and end search... AND... Date2 is after end search
  Example: 9th and 17th

  3 Date1 is between start and end search... AND... Date2 is between start and end search
  Example: 7-12

  4 Date1 is before you start to search for... AND... Date2 is the result of research
  Example: 5-21

  Then translate these terms to sql and test with some sample values. If your fields contain dates that comparisons are simple. If they contain a date and time don't forget to report both in your comparisons.

  There are better ways to write this, but here's an example of how you might begin to translate the above 4 conditions. Once you have the job of the initial query, you can improve the sql.

  Pseudo-CF/SQL

  WHERE (Date1< #start#="" and="" date2="" between="" #start#="" and="" #end#="">
  OR (Date1 BETWEEN #Start # AND #End # AND Date2 > #End #)
  OR (Date1 BETWEEN #Start # AND #End # AND Date2 BETWEEN #Start # AND #End #)
  OR (Date1 < #start#="" and="" date2=""> #End #)

• What is the difference between count (1) selection of the tab and select count (*) tab;

  What is the difference between count (1) selection of the tab and select count (*) tab;

  994122 wrote:

  Hello

  SQL > set timing on

  SQL > select count (*) of the emp

  2 where deptno = 30;

  COUNT (*)

  ---------------

  6

  Elapsed time: 00:00:00.01

  SQL > select count (1) of the emp

  2 * where deptno = 30

  SQL > /.

  COUNT (1)

  -------------

  6

  Elapsed time: 00:00:00.01

  See that both give the same time

  Do you really think the 100th's of a second it takes 6 rows from counting will truly representative of the difference it takes actually?

  Such a small data set cannot possibly show no difference to these larger units of time (in the calculation of terms where we have millions of instructions per second in lieu)

  As the link to the FAQ provided in the response of Anton (first response on this thread) Watch, count (1) and count (*) are essentially the same, except that count (1) actually get re-written by the query re - write the step of the optimization to make it count (*).

  Generally 'count (*)' makes more sense language, because it reads like "count" while "count (1)" reads as "count we ', which does not have as much good sense when you actually count all.

• Whenever I type the letter between f and h (he can't come in here or the problem occurs, so I will use 'p' instead), the locking of the keyboard and an informal search screen is displayed in the toolbar. Also happeninp in emails and 'my documents' but no

  I can't use a certain letter on my keyboard when in Firefox, email or my documents without the Freezin' screen and a pop up appears in my toolbar for a brousin site. The character I can not type is the letter between f and h in the alphabet. I have no problem with this letter in other applications, so I know that's not the keyboard. How to make and use this letter?

  This has happened

  Don't know how many times

  Is a week by o

  Start Firefox in Firefox to solve the issues in Safe Mode to check if one of your modules is causing your problem (switch to the DEFAULT theme: Tools > Modules > themes).
  See the extensions, themes and problems of hardware acceleration to resolve common troubleshooting Firefox problems and troubleshooting questions with plugins like Flash or Java to solve common Firefox problems

  If this does not work in safe mode and then disable all your extensions and then try to find out who is causing by allowing both the problem reappears.
  You can use 'Disable all add-ons' on the start safe mode window.
  You will need to close and restart Firefox after each change through "file > exit" (on Mac: "Firefox > Quit")

• Relationship between db_flashback_retention_target and fast_recovery_area

  Hi all
  
  I was doing a test on Flashback Database on my Oracle 11 g 2 and I would like to seek clarification on the relationship between db_flashback_retention_target and fast_recovery_area. Here is my current settings:
  
  
  SQL > show parameter db_flashback_retention
  
  VALUE OF TYPE NAME
  ------------------------------------ ----------- ------------------------------
  db_flashback_retention_target integer 60
  
  
  SQL > show parameter recovery_file_dest
  
  VALUE OF TYPE NAME
  ------------------------------------ ----------- ------------------------------
  db_recovery_file_dest string L:\app\amosleeyp\fast_recovery
  _area
  whole large db_recovery_file_dest_size 20G
  
  
  That is the question. I know that the db_flashback_retention_target parameter specifies the upper limit (in minutes) to how far back in time, the database can be flashed to the rear. I did a test and this is the sequence of events.
  
  REMOVE FROM SCOTT. EMP WHERE ename = 'KING '. -* 12:13
  FLASHBACK DATABASE IN TIME = ' TO_DATE ('2013-03-25 12:12 ',' YYYY-MM-DD HH24:MI:SS') "; -* 13:30
  Select count (*) Scott. EMP where ename = 'KING '. -* 13:31
  
  COUNT (*)
  ----------
  1
  
  This simple test, I have the database of flashback to more than 60 minutes there despite my window of retention being set at 60 minutes. That's the reason that I have a huge 20 G db_recovery_file_dest_size? So I can't go back in time for more than 60 minutes? Thanks for sharing.

  Hello

  So you mean that the target of retention may be about 59,60, 61minutes or more depending on the space of fast_recovery_area? So it actually fluctuates? ~

  No, it does not fluctuate. fast_recovery_area is just a storage area for versatile use for backup, backup, archived redo logs, and flashback logs etc, so do not confuse with retention of flashback.
  retention of flashback time is time that Oracle will always ensure you the flashback database. If set to 60 minutes, then you will certainly be able to flashback your database at least 60 minutes.
  If your fast recovery area is free, Oracle will not remove the flashback logs (and you might be able to flashback to even several days if flashback logs have not been removed from the quick recovery area). It removes only the flashback logs if fast recovery area a little space left in it.

  Only when I put guaranteed restore points, then it will store always on 60 minutes?

  See below for this concept

  http://docs.Oracle.com/CD/E11882_01/backup.112/e10642/flashdb.htm#autoId8

  Salman

• Select decimal between numbers and replace with comma - style Grep

  H,

  Could someone please help with some Grep expressions.

  I have a big document (s) I need to locate all decimals between numbers and replace them with commas. I have a little grep expression that can locate the numbers and a decimal number, but I need to follow the numbers once again, as I am also find figures at the end of a sentence:

  To find:

  22.356

  so far:

  \d+(?=\.)

  replace:

  \d+(?=\,)

  Lister

  This should work for you

  To find

  (\d+)\. (\d+)

  Replace

  $1, $2

  That there are numbers with a period between them. The expression of replacement will replace your numbers by themselves and the period with a comma. Because the search expression is looking for numbers on both sides of your period, it will leave the ends of sentences only.

• Difference between Oracle and Prometric test center?

  What is the difference between Oracle and Prometric Testing Center?

  Pass the examination in a CTA is exactly the same as the exam at Prometric. The review is exactly the same and it's exactly the same thing. The only difference is the location where the examination is taken, so I believe that over-the-counter medications have set schedules to offer tests, take exams at Prometric can give you a little more freedom to your schedule.

  Answers to the questions:
  can you any valid CTA agent/Center in kolkata? Then I will be very grateful
  -You should go to www.oracle.com/education and you can search on the keywords "certification" or "OTC test"
  - Or you can call your local representative of OU. You can find your local numbers to http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=225
  -Please note that if you are in North America, your search for OTC drugs will not return any results. Over-the-counter medications are not available in North America.

  If someone got 051 OTC and 144 of a promeric / pearson since it granted as OCA?
  Yes

  List there is the offer of TBT that are testing to the general public?
  -You should go to www.oracle.com/education and you can search on the keywords "certification" or "OTC test"
  - Or you can call your local representative of OU. You can find your local numbers to http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=225
  -Please note that if you are in North America, your search for OTC drugs will not return any results. Over-the-counter medications are not available in North America.

  Is there a TBT in countries other than the United States., UK, Japan, Germany?
  -There is no over-the-counter drugs to the United States.
  -There are also over-the-counter drugs in Asia-Pacific

  CTA can be only in branches of Oracle or OAEP?
  -I don't know where are all over-the-counter medications. It is preferable to refer these questions to a representative of the ORGANIZATION unit. They will be better able to help.

  Kind regards
  Brandye Barrington
  Certification Forum Moderator
  Manager certification program

• Let a burn of LED on a random time between 3 and 7 seconds

  Hi all

  Probably, it's a matter of simpel for many of you, but not for me. I try to make a counter reaction time. And I hope someone can help me with the first part: the led must Flash on a random time between 3 and 7 seconds.

  After this need to measure the time between burning directed and by pressing the stop button

  Results ranking in a table

  After the display of ten measures of response time average.

  I hope someone can help me to launch it, I need it for school.

  Thank you!

  Matthijs

  Netherlands

  Code Simon put tapped off.  The Down button was a nice touch, but cannot be disabled so we were testing times preaction and the param 'Trial' could get pretty messy especially on a series of rehearsal

• Communication between LabVIEW and MCU based on Modbus Protocol

  Hello

  I am a first year student in the port.and series applications see you, my projiect needs to communicate between LV and MCU based on Modbus Protocol.all configure it are correct, but the lv to send false information which is not suitable for modbus.i do not know how to fix it.

  My programs are:

  Why did you decide to write your own code instead of what is already available? If you had done a search, you would have easily found the modbus library. Just give a try.

• Delay between angle and entered analog on a 6221

  Hello

  my test setup consists of a (8184 current run LabVIEW RT) embedded PXI controller which uses a PXI-6221 of data acquisition. One of the outputs analog of the 6221 creates a demand for speed that is sent to a servo controller. the servo drives then the test configuration. Between the servo and the remaining test configuration, a quadrature encoder is located. Both the 6221 meters are used to measure the position of the servo (using the trains of pulses A and B) as well as the speed of the servo (frequency of A pulse train). In addition to these counter inputs, some analog inputs of the 6221 serve as well to recored the configuration of test signals.

  In this configuration, one of the analog signal has a frequency of n periods per revolution of servo (determined by the mechanical design of the test facility). But when I leave the servo turn to for example 100 rpm, then decelerate from status quo with a constant deceleration and then draw the analog signal against the measured angle, I see clearly that as long as the speed is telling, I n periods per turn (or a passage from my analog AC to zero each 1/2n towers); However, as soon as the slowdown begins, the plot gets stretched along the axis of the angle (so the plot tells me there are less than n analog periods per turn, which is impossible because it would require the mechanical destruction of the facility).
  However, I can calculate a position based on speed information signal, as I got to the second counter (by integration of the speed). When I do this for the above velocity profile and draw the analog signal against the calculated angle, I see exactly n times / revolution, no matter how fast the installation program is rotating (just the expected behavior).

  So, apparently, the speed measured is "in phase" with analog signals, while the measured angle has a "phase error. Draw the angles measured and calculated against the time tells me the same thing: the measured angle is always late (compared to the calculated angle). The period is not constant throughout the measurement; I've seen values between 30 and 170 ms within a single record. Due to this change of variable, inserting a delay for all channels, but the angle is not a great idea.

  Unfortunately, calculation of the position of the speed signal is no option for me, because the direction of rotation is changed during measurement; because speed information I have based simply on a frequency of pulse train, it contains no information management, therefore a calculated position would be unaware of the changes of direction.

  Does anyone have an idea whence thios delay and what I can do to fix this problem?
  Try a position different methods of decoding or exchanging the meter channels has not made a difference.

  Thank you!

  Hey Kevin,

  attached you will find the last block diagram (no new translation this time, since no changes have been made that require a), which includes your last suggestions (explicitly start the task of AI, remove the excess constraints) with a flat sequence structure that applies all the preparations of task to finish before the start of the first task (I know I could have achieved the same effect of intelligent routing of the signal error, but I think the code is) better readable this way).

  Without OPI, LabVIEW tends to start to have, ao and tasks of the angle of the very different moments, which (for some reason that I don't understand - we have a sample clock based calendar here, and the sample clock is run, well after the three mentioned tasks...) tends to cause delays in the order of several 10-100 ms between tasks. With the structure, this problem is eliminated.

  The Sub - VI just above DAQmx writing contains the "conduct" code that I used in the last screen shot to "serialize" the requested speeds - in this way, the table that contains the requirements of speed does not need to be rebuilt.

  The code that creates a weather channel frequency implicitly timed measure left the VI shown here in a second VI that is running on the host computer, because everything that involves a calculation and does not require any intzeraction with the DAQ hardware is better placed there (the 850 MHz on the PXI controller celeton is slower than 2 definitiely something host GHz Dual-Core system).

  The behavior you mentioned for the task "not started" HERE is what wrote using LabVIEW. I thought the block of relaxation that I had at the beginning would treat the start of the task - at least, the code like this figure repeatedly in the examples that come with LabVIEW.

  I don't really understand what has caused the problems I've had - it seems that it was the combination of the measure quickly loop iteration with the start of task based on trigger HERE, but I do not understand what are the mechanisms in the background caused the problem (too forced loop was not the cause; the same block diagram works well with an additional loop timer).

  If the solution was composed of the following steps:

  -remove the old code calculating speed, replace it with a better code out of the main loop. This allows to

  -reduce considerably the frequency of the main loop.

  -Pull the DAQmx writing out of the loop, and

  s ' ensure that all tasks are started explicitly just before the main loop starts to run.

  -Possibly remove excess constraints of the main loop.

• Switch time delay between 3 and back!

  Hello

  I'm trying to figure out how can I switch between three cases in a case structure for a while between each switch.

  For example: I have three cases in a structure of case (case) {0,1,2} where zero is the default case.

  What I want to do is to start in the case of the value by default 0 wait 1 s switch for case 1, wait 1 second switch case 2, wait 1 second back switch for case 1, wait 1 second back to the 0.  Then repeat the order.

  I used the timer elapsed value of the ramp function Tim from a selection function between true and false, but with the additional case I don't think that this approach works.

  Any ideas?

  Search for the term "State Machine". That's what you're trying to invent (nice work) so feel free to 'Cheat' and look for the wheel as it exists today.

  Ben

• What is the organizational structure of microsoft and what the different type of organization between microsoft and linux

  What is the organizational structure of microsoft and what the different type of organization between microsoft and linux

  Microsoft communities must answer a technical question about Windows 8, Windows 7, Windows Vista and Windows XP.

  If you have a technical question, please let us know. This type of information you are requesting is not available in this forum. Do a search on the internet, and you should be able to find this kind of information.

  Sincerely,

  Marilyn