duplicates | 易学教程

Duplicate json property when converting java object to json string using jackson

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问题 I have Pojo object, with getAsJson function to return Json string for this object. I use JsonProperty to define json properties in this object. Use writeValueAsString of ObjectMapper to write json string for this object. import org.codehaus.jackson.JsonGenerationException; import org.codehaus.jackson.annotate.JsonIgnore; import org.codehaus.jackson.annotate.JsonIgnoreProperties; import org.codehaus.jackson.annotate.JsonProperty; import org.codehaus.jackson.map.JsonMappingException; import org

Remove duplicate rows from a large file in Python

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问题 I've a csv file that I want to remove duplicate rows from, but it's too large to fit into memory. I found a way to get it done, but my guess is that it's not the best way. Each row contains 15 fields and several hundred characters, and all fields are needed to determine uniqueness. Instead of comparing the entire row to find a duplicate, I'm comparing hash(row-as-a-string) in an attempt to save memory. I set a filter that partitions the data into a roughly equal number of rows (e.g. days of

Deleting duplicate record in SQL Server

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I have written a query to remove duplicate records from a table ;WITH a as ( SELECT Firstname,ROW_NUMBER() OVER(PARTITION by Firstname, empID ORDER BY Firstname) AS duplicateRecCount FROM dbo.tblEmployee ) --Now Delete Duplicate Records DELETE FROM tblEmployee WHERE duplicateRecCount > 1 But I don't know where I went wrong it is saying Invalid column name duplicateRecCount Can someone help me? Ian Preston You need to reference the CTE in the delete statement... WITH a as ( SELECT Firstname,ROW_NUMBER() OVER(PARTITION by Firstname, empID ORDER BY Firstname) AS duplicateRecCount FROM dbo

How to keep only one row of a table, removing duplicate rows?

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问题 I have a table that has a lot of duplicates in the Name column. I'd like to only keep one row for each. The following lists the duplicates, but I don't know how to delete the duplicates and just keep one: SELECT name FROM members GROUP BY name HAVING COUNT(*) > 1; Thank you. 回答1: See the following question: Deleting duplicate rows from a table. The adapted accepted answer from there (which is my answer, so no "theft" here...): You can do it in a simple way assuming you have a unique ID field:

How to merge two hashes with no new keys

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问题 How could I merge two hashes that results in no new keys, meaning the merge would merge keys that exist in both hashes? For example, I want the following: h = {:foo => "bar"} j = {:foo => "baz", :extra => "value"} puts h.merge(j) # {:foo => "baz"} I'm looking for a really clean way of doing this as my current implementation is pretty messy. 回答1: You could remove keys that weren't in the first hash from the second hash, then merge: h.merge j.select { |k| h.keys.include? k } Unlike my edited

Excel VBA automation - copy row “x” number of times based on cell value

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I'm attempting to automate Excel in a way that will save me countless hours of tedious data entry. Here's my problem. We need to print barcodes for all of our inventory, which includes 4,000 variants each with a specific quantity. Shopify is our e-commerce platform and they do not support customized exports; however, can export a CSV of all variants, which includes an inventory count column. We use Dymo for our barcode printing hardware/software. Dymo will only print one label per row (it ignores the quantity column). Is there a way to automate excel to duplicate the row "x" number of times

How to check for duplicates in mysql table over multiple columns

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Copy value N times in Excel

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问题 I have simple list: A B item1 3 item2 2 item3 4 item4 1 Need to output: A item1 item1 item1 item2 item2 item3 item3 item3 item3 item4 回答1: Here is one way of doing it without VBA: Insert a column to the left of A, so your current A and B columns are now B and C. Put 1 in A1 Put =A1+C1 in A2 and copy down to A5 Put an empty string in B5, by just entering a single quote ( ' ) in the cell Put a 1 in E1, a 2 in E2, and copy down as to get 1, 2, ..., 10 Put =VLOOKUP(E1,$A$1:$B$5,2) in F1 and copy

More elegant way to check for duplicates in C++ array?

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I wrote this code in C++ as part of a uni task where I need to ensure that there are no duplicates within an array: // Check for duplicate numbers in user inputted data int i; // Need to declare i here so that it can be accessed by the 'inner' loop that starts on line 21 for(i = 0;i < 6; i++) { // Check each other number in the array for(int j = i; j < 6; j++) { // Check the rest of the numbers if(j != i) { // Makes sure don't check number against itself if(userNumbers[i] == userNumbers[j]) { b = true; } } if(b == true) { // If there is a duplicate, change that particular number cout <<

Finding an element in an array that isn't repeated a multiple of three times?

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问题 After reading this interesting question I was reminded of a tricky interview question I had once that I never satisfactorily answered: You are given an array of n 32-bit unsigned integers where each element (except one) is repeated a multiple of three times. In O(n) time and using as little auxiliary space as possible, find the element of the array that does not appear a multiple of three times. As an example, given this array: 1 1 2 2 2 3 3 3 3 3 3 We would output 1, while given the array 3