duplicate-data

问题 I recently ran into a quite puzzling situation. In a table which has a unique constraint set on 2 fields, there are many existing records that violate this constraint! And the main question is: How could they have gotten there in the first place, with the unique constraint already in place? Schema: CREATE TABLE `rest_service_mediafile` ( `id` int(11) NOT NULL AUTO_INCREMENT, `video_id` int(11) NOT NULL, `video_encoding_id` int(11) NOT NULL, `external_id` int(11) DEFAULT NULL, PRIMARY KEY (`id

问题 I need to delete duplicated values of this table: +----+-------+-------------+---------+ | id | name | description | surname | +----+-------+-------------+---------+ | 1 | Peter | Member | Hitsh | | 2 | James | Member | Tach | | 3 | Mary | Member | Popims | | 4 | Peter | Member | Hitsh | +----+-------+-------------+---------+ I would want to remove all the duplicated values with the same name and surname . 回答1: To keep the row with the smallest id for every set of duplicates on (name, surname

问题 I'm attempting to find an example that demonstrates a Lucene or some other kind of index that can check an English first & last name combination for possible duplicates. The duplicate check needs to be able to take into account common nicknames, i.e. Bob for Robert and Bill for William, as well as spelling mistakes. Does anyone know of an example? I plan to perform the duplicates search during user registration. The new user record needs to be checked against an index that has been built from

问题 i have 4 fields at DB.i set them become cant duplicate entry.They are: 1. Model Varchar(14) Unique 2. Serial varchar(8) Unique 3. Lot varchar(5) Unique 4. Line char(5) Unique Model Serial Lot Line First data remocon x0001 033a fa 01 and if i have inputed same data it can't recorded. remocon x0001 033a fa 01 but how to make this data success to input if i type like: remocon x0002 033a fa 01 and i want the result like: Model Serial Lot Line remocon x0001 033a fa 01 remocon x0002 033a fa 01 回答1:

问题 I have a table below : +-----+-------+------+------------+ | ID | RefID | Type | EventTime | +-----+-------+------+------------+ | 101 | 228 | 1 | 1437195633 | | 102 | 228 | 5 | 1437195633 | | 103 | 228 | 1 | 1437195633 | | 104 | 228 | 1 | 1437195442 | | 105 | 228 | 1 | 1437195442 | | 106 | 228 | 5 | 1437195442 | | 107 | 228 | 1 | 1437165634 | | 108 | 228 | 5 | 1437165442 | | 109 | 228 | 1 | 1437165634 | | 110 | 228 | 5 | 1437165442 | +-----+-------+------+------------+ In that I want to stop

问题 i am writing web application in asp.net . i have a input form . i want when the client click on save Button before insert, check this data is in data base or not . i have written it with code behind . but i want do this with java script because when i i use code behind the page refresh . this is my .net code for check duplicate data: SqlCommand commandrepeat1 = new SqlCommand("Select code from CmDet where code = " + txtcode.Text + " and company = " + DataBase.globalcompany.ToString() + "

问题 Using Access 2010. So if I had a table COL1 A B A C A and the run the query I would get the output in COL2 where 'A' is duplicated three times and its COL2 value is in turn incremented. COL1 | COL2 A | 1 B | 1 A | 2 C | 1 A | 3 回答1: Add a field to your table. Choose AutoNumber as its data type and make it the table's primary key. I named the field ID , so my version of your sample data looks like this ... ID COL1 1 A 2 B 3 A 4 C 5 A The SELECT statement below returns this result set ... ID

问题 I have a requirement where I need to create a duplicate/copy section of .data section. I've tried creating a dummy section with same size of data section in linker script and copy the contents of data section to the dummy section in the init functions of my ELF image, but that doesn't suit my requirement, as I want the copy/duplicate section to be created along with final ELF image not during the execution of it. Below is what I wanted in my linker script, SECTIONS { .data : { <data section

问题 I have files with these kind of duplicate lines, where only the last field is different: OST,0202000070,01-AUG-09,002735,6,0,0202000068,4520688,-1,0,0,0,0,0,55 ONE,0208076826,01-AUG-09,002332,316,3481.055935,0204330827,29150,200,0,0,0,0,0,5 ONE,0208076826,01-AUG-09,002332,316,3481.055935,0204330827,29150,200,0,0,0,0,0,55 OST,0202000068,01-AUG-09,003019,6,0,0202000071,4520690,-1,0,0,0,0,0,55 I need to remove the first occurrence of the line and leave the second one. I've tried: awk '!x[$0]++

问题 My problem is that I have multiple unique keys on a table. Insert ignore is not an option because it suppresses the errors. MySQL has no support for any type of conditionals outside a statement (ex. if (cond) then insert else don't insert) Stored procedures are not an option (the only place I can use the if/else statements) On duplicate key might update a key with a new value, but I want the unique keys not to change in case one fails the unique constraint. So the only option would be on