unique

问题 I am wondering how to generate a GUID given an input string, such that the same input string results in the same GUID (sort of like an MD5 hash). The problem with MD5 hashes is they just guarantee low collision rate, rather than uniqueness. Instead I would like something like this: guid('v1.0.0') == 1231231231123123123112312312311231231231 guid('v1.0.1') == 6154716581615471658161547165816154716581 guid('v1.0.2') == 1883939319188393931918839393191883939319 How would you go about implementing

问题 I'm using Microsoft SQL Server. And Here is my table Added sample data format text as table ╒══════════╤═════════════╤══════════╤═══════╤═════════════╤═════════════════════╤══════════════════╤══════════════════════╤══════════╤═════════════╤═════╤════════════╤════════════╤════════════╤══════════╕ │ RecordID │ ID Employee │ Resource │ Shift │ ProjectID │ Drawing No │ Production order │ PN │ Quantity │ ProductName │ BNo │ Start Date │ Start Time │ End Date │ End Time │ ╞══════════╪═════════════╪

问题 The table below was created from another table with columns ID,Name,Organ,and Age. The values found in the Organ column were codes which designated both organ and condition. Using CASE I made a table like this: -------------------------------------------------------- ID NAME Heart Brain Lungs Kidneys AGE 1318 Joe Smith NULL NULL NULL NULL 50 1318 Joe Smith NULL NULL NULL NULL 50 1318 Joe Smith NULL NULL NULL Below 50 1318 Joe Smith NULL NULL NULL Below 50 1318 Joe Smith NULL NULL Above NULL

问题 What's the best way to remove duplicate objects from array of objects? From var arr = [ {"name":"Joe", "age":17}, {"name":"Bob", "age":17}, {"name":"Carl", "age": 35}, {"name":"Bob", "age":35}, {"name":"Joe", "age":17}, ] when duplicates removed, the expected result is res= arr = [ {"name":"Joe", "age":17}, {"name":"Bob", "age":17}, {"name":"Carl", "age": 35}, {"name":"Bob", "age":35}, ] (5 objects, 1 duplicate, 4 left). The number of properties of each object is fixed, the properties names

问题 I create laravel form validation request and have unique rules on that validation. I want use it on store and update method without create new form request validation again. but the problem is when on store the id doesnt exist and the validate is passed and when on update i failed the pass the validating because the id is exist on storage i want to ignore the id on unique rules but use same form validate request what is best practice to check on form validate request class if this action from

问题 I would like to create a method which takes either a filename as a string or a FileInfo and adds an incremented number to the filename if the file exists. But can't quite wrap my head around how to do this in a good way. For example, if I have this FileInfo var file = new FileInfo(@"C:\file.ext"); I would like the method to give me a new FileInfo with C:\file 1.ext if C:\file.ext existed, and C:\file 2.ext if C:\file 1.ext existed and so on. Something like this: public FileInfo MakeUnique

问题 Please help me to count the number of unique IDs per Date. so, initially, there is this data frame of IDs and dates ID Date 1 2009/11/1 1 2009/11/2 1 2009/11/2 2 2009/11/1 2 2009/11/1 2 2009/11/2 3 2009/11/1 3 2009/11/3 It is possible to rearrange it by date. If we do so then we will see that on the 1st there are 3 unique IDs. On the 2ed 2 unique ID and on the 3rd there is one unique ID. So the final table should look like this: Date uniqueIDs 2009/11/1 3 2009/11/2 2 2009/11/3 1 I know that

问题 I need to generate a unique code with 5 lengths with the given number. In other words, I need to encode natural number to 5 length unique code I wanna give fixed-length rememberable code to the customer, and keep the sequential number in the database and encode or decode when needed. The given number can be in the range of 1 to 9999999. But the result always must be 5 lengths. for example 1 => a56er or 2 => c7gh4 Uniqueness is important I googled a lot and I can't find a solution. 回答1: The

问题 I need to generate a unique code with 5 lengths with the given number. In other words, I need to encode natural number to 5 length unique code I wanna give fixed-length rememberable code to the customer, and keep the sequential number in the database and encode or decode when needed. The given number can be in the range of 1 to 9999999. But the result always must be 5 lengths. for example 1 => a56er or 2 => c7gh4 Uniqueness is important I googled a lot and I can't find a solution. 回答1: The

问题 I have a dataframe which is has dimension of 2377426 rows by 2 columns, which looks something like this: Name Seq 428293 ENSE00001892940:ENSE00001929862 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 431857 ENSE00001892940:ENSE00001883352 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGGAAGTAAATGAGCTGATGGAAGAGC 432253 ENSE00001892940:ENSE00003623668 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGGAAGTAAATGAGCTGATGGAAGAGC 436213 ENSE00001892940:ENSE00003534967