compare

问题 So here is my issue I am comparing new and old values when a table row is being updated. But the new or old value will sometimes be null. So the code below doesn't work. Can can I remedy this issue? Thank You BEFORE UPDATE ON mytable FOR EACH ROW BEGIN IF OLD.assignedto != NEW.assignedto THEN INSERT INTO history ( asset , changedfield , oldvalue , newvalue ) VALUES ( NEW.asset, 'assignedto', OLD.assignedto, NEW.assignedto ); END IF; END$$ 回答1: Try: IF ( (OLD.assignedto IS NOT NULL AND NEW

问题 The line return array[index1].compareTo(array[index2]); provides an error "Cannot invoke compareTo(double) on the primitive type double" . How to solve this issue? /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/ /*:: This function implements a comparator of double values :*/ /*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/ private class ArrayIndexComparator implements Comparator<Integer> { private final double[] array; public ArrayIndexComparator

问题 I want to compare the first column of before.txt with the first column of after.txt line per line ( the first with the first,the second with the second and so on). As output now I get only the last value E992A84B8C8A1FEF3B94242403D5D84B two times. My question is how to compare all the lines and get the result message? FOR /F "tokens=1 delims= " %%G IN (before.txt) DO set variable1=%%G FOR /F "tokens=1 delims= " %%I IN (after.txt) DO set variable2=%%I echo !variable1! echo !variable2! if /I

问题 I have this file error.log [00:00:00.284],501, [00:00:00.417],5,5294100071980 [00:00:02.463],501, [00:00:05.169],501, [00:00:05.529],501, [00:00:05.730],501, so, if the field $3 its empty i want to print "No value" Im trying this code awk '{{FS=","} if($3=="") {print $1,$2,"No value"}}' But it prints >[00:00:00.284] 501 No value >[00:00:02.463] 501 No value >[00:00:05.169] 501 No value >[00:00:05.529] 501 No value >[00:00:05.730] 501 No value >[00:00:07.193] 501 No value >[00:00:09.899] 501

问题 Introduction - This question has been updated the 27th May 2018: I have 1 PHP multidimensional-array, containing 6 sub-arrays, each containing 20 sub-sub-arrays, which in turn, each contain 2 sub-sub-arrays, one being a string (header), the other being an unspecified number of keywords (keywords). I am looking to compare each of the 120 sub-sub-arrays to the 100 other sub-sub-arrays contained in the remainint 5 sub-arrays. So that sub-sub-array 1 in sub-array 1 is compared to sub-array 1 to

问题 I need to compare 2 string dates to see if one date is later then another. The date format for both dates is at the bottom. i can rearrange this for what ever is easiest. I have boost but it doesn't have to be, ive been through so many examples and can't seem to wrap my brain around getting it to work. Thanks in advance basically i want 2012-12-06 14:28:51 if (date1 < date2) { // do this } else { // do that } 回答1: It looks like the date format your using is already in lexicographical order

问题 I would like to compare two NSDates however every date shows as being "Earlier" than todaysDate . Any ideas? let compareResult = self.todaysDate.compare(self.date) if compareResult == NSComparisonResult.OrderedDescending { println("Today is later than date2") } else { println("Future") } To get "todaysDate" let todaysDate = NSDate() let calendar = NSCalendar.currentCalendar() let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute | .CalendarUnitMonth | .CalendarUnitYear

问题 I would like to know how to compare two two-dimension arrays value. First array Array 1 ( [0] => Array ( [0] => a ) [1] => Array ( [0] => b ) [2] => Array ( [0] => c ) } Second one Array 2 ( [0] => Array ( [0] => a ) [1] => Array ( [0] => d ) [2] => Array ( [0] => e ) } I need to make my loop to compare the arrays and check the matched value. In my case, array1[0][0]=a matches array2[0][0]=a. If it matches, php will output some html. My foreach loop foreach ($array1 as $arrays){ foreach(

问题 Code: public void placeO(int xpos, int ypos) { for(int i=0; i<3;i++) for(int j = 0;j<3;j++) { // The line below does not work. what can I use to replace this? if(position[i][j]==' ') { position[i][j]='0'; } } } 回答1: Change it to: if(position[i][j] == 0) Each char can be compared with an int. The default value is '\u0000' i.e. 0 for a char array element. And that's exactly what you meant by empty cell , I assume. To test this you can run this. class Test { public static void main(String[] args

问题 How can I compare two NSDates and return the amount of time between them. For example: 2010-06-20 14:29:41 -0400 2010-06-20 14:53:29 -0400 should return something like: 23 or 24 (minutes), rounding the seconds because I don't really need the seconds. 回答1: try something like: int intervall = (int) [date1 timeIntervalSinceDate: date2] / 60; 回答2: Here the complete snippet to compare two NSDate which you may find more useful based on your query. NSCalendar *myCal = [[NSCalendar alloc]