duplicates

问题 sorry for the (probably) noob question, but I', new at this stuff. i have a table that has column 'position', and I want to, when inserting a new row, change positions of every row that has position lower than row that is inserted. for example, if I add row with position 4, if there is a duplicate, it should become 5, 5 should shift to 6 and so on... also, is there a way to get highest value for column besides testing it in every row via php? 回答1: You need two queries. Assuming you know the

问题 I want to remove duplicates based on similarities or differences of other columns. All the duplicated ID should be completely removed but just if they have DIFFERENT colours. It doesn't matter if they have different subgroups as well. If they have the same ID AND the same colour, just the first one should be kept. At the end I want to have a list of all ID which are single-colour only (independent of subgroup). All the multicoloured ID should be removed. Here and example: id colour subgroup 1

问题 I have two arrays of ArrayList. public class ProductDetails { public string id; public string description; public float rate; } ArrayList products1 = new ArrayList(); ArrayList products2 = new ArrayList(); ArrayList duplicateProducts = new ArrayList(); Now what I want is to get all the products (with all the fields of ProductDetails class) having duplicate description in both products1 and products2 . I can run two for/while loops as traditional way, but that would be very slow specially if I

问题 I'm trying to add a list of names from another worksheet that has duplicates. On the listbox, I want to have unique names, instead of duplicates. The following code is not sorting them for duplicates, it errors out. Any help is appreciated. Dim intCount As Integer Dim rngData As Range Dim strID As String Dim rngCell As Range dim ctrlListNames as MSForms.ListBox Set rngData = Application.ThisWorkbook.Worksheets("Names").Range("A").CurrentRegion 'declare header of strID and sort it strID =

问题 So for an assignment I have to generate a random code, and have someone guess the code in the console. Now My problem is that I can't seem to find a way to replace any duplicate characters in the code. The code must range in "ABCDEF", and contain 4 letters. This is what I got so far: char codeLetters; String masterCode; StringBuilder strings = new StringBuilder(); Random random = new Random(); for (int i = 0; i < 4; i++) { codeLetters = code[random.nextInt(code.length)]; strings.append

问题 I need to know which mail clients support the "automated labeler" email address format. From research I have found only one: Gmail. They support labeled email addresses like: name+label_1@gmail.com name+label_2@gmail.com etc. The above emails are unique but reference name@gmail.com with unique labels. Follow this question and answer for more insight on this topic. Note that the "automated labeler" isn't a GMail specific feature, Gmail simply popularised it.. Other mail servers support this

问题 I am working on a script that duplicates folders from an afp share to a local folder and does all kind of things with those folders afterwards. (it deletes the original folders after duplicating) This code is working fine: tell application "Finder" duplicate every folder of folder afpFolder to localFolder with replacing delete every folder of folder afpFolder end tell My problem is that our employees will be adding new folders to afpFolder regulary and quite often. My script is running every

问题 I'm pretty new to Python and Qgis, right now I'm just running scripts but I my end-goal is to create a plugin. Here's the part of the code I'm having problems with: import math layer = qgis.utils.iface.activeLayer() iter = layer.getFeatures() dict = {} #iterate over features for feature in iter: #print feature.id() geom = feature.geometry() coord = geom.asPolyline() points=geom.asPolyline() #get Endpoints first = points[0] last = points[-1] #Assemble Features dict[feature.id() ]= [first, last

问题 I have a quick function that I threw up together to remove duplicates on my table given a particular combination of fields: for l in table.select(): if table.select().where((table.Field1==l.Field1) & (table.Field2==l.Field2) & ....).count()>1: l.delete() l.save() But I imagine that there's a better way to do this 回答1: You could add a unique constraint on the columns you wish to be unique, then let the database enforce the rules for you. That'd be the best way. For peewee, that looks like:

问题 I have a mySQL table with duplicate entries (perhaps in some cases multiple duplicates). I have column called id, which may contain duplicate ids and one called unique id which, as the name suggest contains unique ids. Using the following SQL statement I am able to select the duplicate row SELECT id, COUNT(id) AS NumOccurrences FROM `TABLE 3` GROUP BY id HAVING ( COUNT(id) > 1 ) but how do I delete (all but one of) them? 回答1: DELETE t1 FROM test t1, test t2 WHERE t1.unique_id > t2.unique_id