If you have duplicates in your table and you use ALTER TABLE mytable ADD UNIQUE INDEX myindex (A, B, C, D); the query will fail with Error 1062 (duplicate key). But if you use IGNORE — (only works before MySQL 5.7.4) ALTER IGNORE TABLE mytable ADD UNIQUE INDEX myindex (A, B, C, D); the duplicates … Read more
Since you can’t use LINQ, you can do this with collections and loops instead: static void Main(string[] args) { int[] array = { 10, 5, 10, 2, 2, 3, 4, 5, 5, 6, 7, 8, 9, 11, 12, 12 }; var dict = new Dictionary<int, int>(); foreach(var value in array) { // When the key … Read more
My solution with map and lambda: print map(lambda x: x[1] + str(mylist[:x[0]].count(x[1]) + 1) if mylist.count(x[1]) > 1 else x[1], enumerate(mylist)) More traditional form newlist = [] for i, v in enumerate(mylist): totalcount = mylist.count(v) count = mylist[:i].count(v) newlist.append(v + str(count + 1) if totalcount > 1 else v) And last one [v + str(mylist[:i].count(v) … Read more
You could use windowed COUNT: SELECT sub.name, sub.employee_id FROM (SELECT *, COUNT(*) OVER(PARTITION BY employee_id) AS c FROM users) AS sub WHERE c > 1; LiveDemo or simple IN: SELECT * FROM users WHERE employee_id IN (SELECT employee_id FROM users GROUP BY employee_id HAVING COUNT(employee_id) > 1); LiveDemo2 or correlated subquery: SELECT name, employee_id FROM … Read more
Here is my take on it. select * from ( SELECT id, ROW_NUMBER() OVER(PARTITION BY merchant_Id, url ORDER BY id asc) AS Row FROM Photos ) dups where dups.Row > 1 Feel free to play with the order by to tailor the records you want to delete to your specification. SQL Fiddle => http://sqlfiddle.com/#!15/d6941/1/0 SQL … Read more
Have a look Simian, you can use it for Java, C#, C, C++, COBOL, Ruby, JSP, ASP, HTML, XML, Visual Basic, Groovy source code and even plain text files. Also, a similar question here.
Do a remove before each add: someSet.remove(myObject); someSet.add(myObject); The remove will remove any object that is equal to myObject. Alternatively, you can check the add result: if(!someSet.add(myObject)) { someSet.remove(myObject); someSet.add(myObject); } Which would be more efficient depends on how often you have collisions. If they are rare, the second form will usually do only one … Read more
Integer[] arr = {…}; Collections.shuffle(Arrays.asList(arr)); For example: public static void main(String[] args) { Integer[] arr = new Integer[1000]; for (int i = 0; i < arr.length; i++) { arr[i] = i; } Collections.shuffle(Arrays.asList(arr)); System.out.println(Arrays.toString(arr)); }
You may get some good use out of the Amoeba gem for ActiveRecord 3.2. It supports easy and automatic recursive duplication of has_one, has_many and has_and_belongs_to_many associations, field preprocessing and a highly flexible and powerful configuration DSL that can be applied both to the model and on the fly. be sure to check out the … Read more
{ allowDiskUse: true } Should be placed right after the aggregation pipeline. In your code this should go like this: db.getCollection(‘RAW_COLLECTION’).aggregate([ // Group on unique value storing _id values to array and count { “$group”: { “_id”: { RegisterNumber: “$RegisterNumber”, Region: “$Region” }, “ids”: { “$push”: “$_id” }, “count”: { “$sum”: 1 } }}, // … Read more