duplicates

问题 Please look at the following query: tbl_Contents Content_Id Content_Title Content_Text 10002 New case Study New case Study 10003 New case Study New case Study 10004 New case Study New case Study 10005 New case Study New case Study 10006 New case Study New case Study 10007 New case Study New case Study 10008 New case Study New case Study 10009 New case Study New case Study 10010 SEO News Title SEO News Text 10011 SEO News Title SEO News Text 10012 Publish Contents SEO News Text tbl_Media Media

问题 I inserted between two tables fields A,B,C,D, believing I had created a Unique Index on A,B,C,D to prevent duplicates. However I somehow simply made a normal index on those. So duplicates got inserted. It is 20 million record table. If I change my existing index from normal to unique or simply a add a new unique index for A,B,C,D will the duplicates be removed or will adding fail since unique records exist? I'd test it yet it is 30 mil records and I neither wish to mess the table up or

问题 Before inserting into the database, I'm using the following code to check for duplicates. To me, a duplicate is only considered a duplicate when name , description , price , city , and enddate match. foreach($states_to_add as $item) { $dupesql = "SELECT COUNT(*) FROM table WHERE ( name = '$name' AND description = '$description' AND manufacturer = '$manufacturer' AND city ='$city' AND price = '$price' AND enddate = '$end_date' )"; $duperaw = mysql_query($dupesql); if($duperaw > 0) { echo nl2br

问题 I have a Magento store installed, and when a product is duplicated in the backend, Magento sets its status to Disabled by default. I don't want that to happen, the duplicated product should have its status copied from the original product as well. In this post a partial solution was given. I see where I can find the config.xml and make the necessarry changes. However, where do I put such an observer class? Which file should I use/create and would that require any changes to the config.xml

问题 I am trying to find duplicate values in one column and combine the values of a second column into one row. I also want to sum the values in a third column. For example: A B C D h 4 w 3 h 4 u 5 h 4 g 7 h 4 f 4 k 9 t 6 k 9 o 6 k 9 p 9 k 9 j 1 Would become A B C D k 9 t;o;p;j 22 h 4 w;u;g;f 19 The code I have been using for the first part of this is Sub mergeCategoryValues() Dim lngRow As Long With ActiveSheet lngRow = .Cells(65536, 1).End(xlUp).Row .Cells(1).CurrentRegion.Sort key1:=.Cells(1),

问题 I am trying to find duplicate values in one column and combine the values of a second column into one row. I also want to sum the values in a third column. For example: A B C D h 4 w 3 h 4 u 5 h 4 g 7 h 4 f 4 k 9 t 6 k 9 o 6 k 9 p 9 k 9 j 1 Would become A B C D k 9 t;o;p;j 22 h 4 w;u;g;f 19 The code I have been using for the first part of this is Sub mergeCategoryValues() Dim lngRow As Long With ActiveSheet lngRow = .Cells(65536, 1).End(xlUp).Row .Cells(1).CurrentRegion.Sort key1:=.Cells(1),

问题 Suppose I have a data.table like this: Table: V1 V2 A B C D C A B A D C I want each row to be regarded as a set, which means that B A and A B are the same. So after the process, I want to get: V1 V2 A B C D C A In order to do that, I have to first sort the table row-by-row and then use unique to remove the duplicates. The sorting process is quite slow if I have millions of rows. So is there an easy way to remove the duplicates without sorting? 回答1: For just two columns you can use the

问题 Grouping elements in array by multiple properties is the closest match to my question as it indeed groups objects by multiple keys in an array. Problem is this solution doesn't sum up the properties value then remove the duplicates, it instead nests all the duplicates in a two-dimensional arrays. Expected behavior I have an array of objects which must be grouped by shape and color . var arr = [ {shape: 'square', color: 'red', used: 1, instances: 1}, {shape: 'square', color: 'red', used: 2,

问题 Let's say I have four samples: id=1, 2, 3, and 4, with one or more measurements on each of those samples: > a <- data.frame(id=c(1,1,2,2,3,4), value=c(1,2,3,-4,-5,6)) > a id value 1 1 1 2 1 2 3 2 3 4 2 -4 5 3 -5 6 4 6 I want to remove duplicates, keeping only one entry per ID - the one having the largest absolute value of the "value" column. I.e., this is what I want: > a[c(2,4,5,6), ] id value 2 1 2 4 2 -4 5 3 -5 6 4 6 How might I do this in R? 回答1: First. Sort in the order putting the less

问题 I've seen a number of variations on this but nothing quite matches what I'm trying to accomplish. I have a table, TableA , which contain the answers given by users to configurable questionnaires. The columns are member_id, quiz_num, question_num, answer_num . Somehow a few members got their answers submitted twice. So I need to remove the duplicated records, but make sure that one row is left behind. There is no primary column so there could be two or three rows all with the exact same data.