duplicates

问题 I'm using PostgreSQL database, after I've created my table I have to populate them with a CSV file. However the CSV file is corrupted and it violates the primary key rule and so the database is throwing an error and I'm unable to populate the table. Any ideas how to tell the database to ignore the duplicates when importing from CSV? Writing a script to remove them from the CSV file is no acceptable. Any workarounds are welcome too. Thank you! : ) 回答1: On postgreSQL, duplicate rows are not

问题 I'm using CMake, and I want to add a compilation flag to some flags variable. For example, I want to add -DFOO to the CMAKE_CXX_FLAGS_RELEASE variable. Right now, I use: set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DFOO" ) ... but if there already is a -DFOO flag, I get it double, which might be harmless but I'd rather avoid it. Assuming I can't control whether or not there's a -DFOO to begin with - how can I "add a flag only if it's missing" to such a flags variable? Notes: An

问题 What causes ajax to send more than one POST request at the same time? It is hard to reproduce since it happens about 2% of the time. It seems to happen on bad/mobile networks. We are using Chrome on Android. How Form Works .keyup event listener waits for N characters and then sends the data from the form after some minor validation via an ajax call. The form is immediately cleared so that another request can be sent. onSuccess returns and updates a totals table. Problem The system saves

问题 I’m using Postgres 9.5. I have the below query that is designed to find identical rows of data (but unique IDs) in my table. select e.name, e.day, e.distance, e.created_at, e2.created_at from events e, events e2 where e.name = e2.name and e.distance = e2.distance and e.day = e2.day and e.web_crawler_id = e2.web_crawler_id and e.id <> e2.id and e.web_crawler_id = 1 order by e.day desc; I ultimately want to delete one of the duplicate rows — so perhaps deleting the row with the greatest

问题 When I merge two CSV files, of the format (date, someValue), I see some duplicate records. If I reduce the records to half the problem goes away. However, if I double the size of both the files it worsens. Appreciate any help! My code: i = pd.DataFrame.from_csv('i.csv') i = i.reset_index() e = pd.DataFrame.from_csv('e.csv') e = e.reset_index() total_df = pd.merge(i, e, right_index=False, left_index=False, right_on=['date'], left_on=['date'], how='left') total_df = total_df.sort(column='date')

问题 This question already has answers here : How to select the row with the maximum value in each group (10 answers) Closed 12 months ago . I am trying to analyse large data-sets of student scores. Some students do retakes which produces duplicate scores, usually with the earlier low score placed the row above their retake, usually higher, score. I want to select their highest score, with a file that has only one line per student (which I will need to merge with other files having same ids).

问题 I'm using Google Sheets and this is way beyond my simple scripting. I have numerous cells containing comma separated values; AA, BB, CC, BBB, CCC, CCCCC, AA, BBB, BB BB, ZZ, ZZ, AA, BB, CC, BBB, CCC, CCCCC, AA, BBB, BB I'm trying to return: AA, BB, CC, BBB, CCC, CCCCC etc. BB, ZZ, AA, CC, BBB, CCC, CCCCC etc. ... remove the duplicates. Per cell. I can't get my head around a solution. I've tried every online tool that removes duplicates. BUT they all remove duplicates throughout my document.

问题 It's possible to make a query to see if there is duplicated records in the same row? I tried to find a solution but all I can find is to detected duplicated fields in columns, not in rows. example, let's say I have a table with rows and items: | id | item1 | item2 | item3 | item4 | item5 | upvotes | downvotes | -------------------------------------------------------------------- | 1 | red | blue | red | black | white | 12 | 5 | So I want to see if is possible to make a query to detect the

问题 How can I find out duplicate rows based on a single column. I have a table in oracle which has data as given below and it has duplicates. I'm trying to select and view all rows with duplicate employee ids as explained below EMP table: EmpId Fname Lname Mname Jobcode Status exp_date 1 Mike Jordan A IT W 12/2014 1 Mike Jordan A IT A 12/2014 2 Angela ruth C sales P 12/2015 2 Angela ruth C IT W 12/2015 3 Kelly Mike B sales W 12/2015 From the above table i want to select all rows which duplicate

问题 I have a text file and I have 3 of the same numbers somewhere in the file. I need to add incrementally to each using PowerShell. Below is my current code. $duped = Get-Content $file | sort | Get-Unique while ($duped -ne $null) { $duped = Get-Content $file | sort | Get-Unique | Select -Index $dupecount $dupefix = $duped + $dupecount echo $duped echo $dupefix (Get-Content $file) | ForEach-Object { $_ -replace "$duped", "$dupefix" } | Set-Content $file echo $dupecount $dupecount = [int]