duplicate-data

SQL Duplicate Delete Query over Millions of Rows for Performance

由 邮差的信 提交于 2019-12-08 00:53:49
问题 This has been an adventure. I started with the looping duplicate query located in my previous question, but each loop would go over all 17 million records , meaning it would take weeks (just running *select count * from MyTable* takes my server 4:30 minutes using MSSQL 2005). I gleamed information from this site and at this post. And have arrived at the query below. The question is, is this the correct type of query to run on 17 million records for any type of performance? If it isn't, what

Remove duplicates based on a specific key

由 痞子三分冷 提交于 2019-12-07 14:40:58
问题 Got a multidimensional array like this one: $A = array( [0]=> array( ["rel"]=> 4 ["name"]=> "Bar" ... ) [1]=> array( ["rel"]=> 2 ["name"]=> "Bar" ... ) [2]=> array( ["rel"]=> 1 ["name"]=> "Foo" ... ) [3]=> array( ["rel"]=> 5 ["name"]=> "Bar" ... ) [4]=> array( ["rel"]=> 4 ["name"]=> "Tee" ... ) ) I want to remove duplicates based on a specific key while maintaining the original array structure except index keys. For the sake of this example let's say I want to remove those sub-arrays with

Partial and duplicate records while sqoop import

由 …衆ロ難τιáo~ 提交于 2019-12-07 11:52:27
问题 Sqoop import is resulting in duplicate/partial records when we are using the following setting --query - Custom Query --split-by - Non-integer column (char) --num-mappers - More than 2 Verified the source data count say 1000 records Verified the import data count say 1923 records 回答1: When using the split-by and field is non integer . Sqoop uses TextSplitter which provides a warning as follows : WARN db.TextSplitter: If your database sorts in a case-insensitive order, this may result in a

mysql duplicate data deletion

由 冷暖自知 提交于 2019-12-07 08:25:35
问题 This shows me all the first names and last names that have exactly two entries that are identical SELECT `firstname`,`lastname`,COUNT(*) AS Count FROM `people` GROUP BY `firstname`,`lastname` HAVING Count = 2 How do I turn this into a DELETE FROM WHERE statement with a LIMIT to only remove one of each of the entries and leave the other one. okay this appears to be way to technical i'm just going to do it in a php while loop 回答1: You can create a table with 1 record of each of the duplicates:

What is the fastest way / script to duplicate visual studio project?

由 喜欢而已 提交于 2019-12-07 07:00:17
问题 Hello I have setup visual studio express c++ project, with paths to included headers and libs Now I like to duplicate this project to be with the same paths to included headers and libs But with different name , I don’t what to go manually into .vcproj file and start to changes names Is there better way? 回答1: Probably the easiest and fastest way of doing this is using Windows Explorer to just make a copy of the entire project. You will most likely need to assign the copied .vcproj file a new,

How to compare 2 lists and merge them in Python/MySQL?

由 大憨熊 提交于 2019-12-06 15:09:16
问题 I want to merge data. Following are my MySQL tables. I want to use Python to traverse though a list of both Lists (one with dupe = 'x' and other with null dupes). This is sample data. Actual data is humongous. For instance : a b c d e f key dupe -------------------- 1 d c f k l 1 x 2 g h j 1 3 i h u u 2 4 u r t 2 x From the above sample table, the desired output is : a b c d e f key dupe -------------------- 2 g c h k j 1 3 i r h u u 2 What I have so far : import string, os, sys import

SQL: Removing Duplicate records - Albeit different kind

由 社会主义新天地 提交于 2019-12-06 01:35:48
问题 Consider the following table: TAB6 A B C ---------- ---------- - 1 2 A 2 1 A 2 3 C 3 4 D I consider, the records {1,2, A} and {2, 1, A} as duplicate. I need to select and produce the below record set: A B C A B C ---------- ---------- - ---------- ---------- - 1 2 A or 2 1 A 2 3 C 2 3 C 3 4 D 3 4 D I tried the below queries. But to no avail. select t1.* from t6 t1 , t6 t2 where t1.a <> t2.b and t1.b <> t2.a and t1.rowid <> t2.rowid / A B C ---------- ---------- - 1 2 A 2 1 A 2 1 A 2 3 C 3 4 D

How can I find indices of each row of a matrix which has a duplicate in matlab?

由 我的未来我决定 提交于 2019-12-05 23:18:49
问题 I want to find the indices all the rows of a matrix which have duplicates. For example A = [1 2 3 4 1 2 3 4 2 3 4 5 1 2 3 4 6 5 4 3] The vector to be returned would be [1,2,4] A lot of similar questions suggest using the unique function, which I've tried but the closest I can get to what I want is: [C, ia, ic] = unique(A, 'rows') ia = [1 3 5] m = 5; setdiff(1:m,ia) = [2,4] But using unique I can only extract the 2nd,3rd,4th...etc instance of a row, and I need to also obtain the first. Is

Partial and duplicate records while sqoop import

由 倾然丶 夕夏残阳落幕 提交于 2019-12-05 21:54:31
Sqoop import is resulting in duplicate/partial records when we are using the following setting --query - Custom Query --split-by - Non-integer column (char) --num-mappers - More than 2 Verified the source data count say 1000 records Verified the import data count say 1923 records When using the split-by and field is non integer . Sqoop uses TextSplitter which provides a warning as follows : WARN db.TextSplitter: If your database sorts in a case-insensitive order, this may result in a partial import or duplicate records WARN db.TextSplitter: You are strongly encouraged to choose an integral

Remove duplicates based on a specific key

由 不打扰是莪最后的温柔 提交于 2019-12-05 20:05:14
Got a multidimensional array like this one: $A = array( [0]=> array( ["rel"]=> 4 ["name"]=> "Bar" ... ) [1]=> array( ["rel"]=> 2 ["name"]=> "Bar" ... ) [2]=> array( ["rel"]=> 1 ["name"]=> "Foo" ... ) [3]=> array( ["rel"]=> 5 ["name"]=> "Bar" ... ) [4]=> array( ["rel"]=> 4 ["name"]=> "Tee" ... ) ) I want to remove duplicates based on a specific key while maintaining the original array structure except index keys. For the sake of this example let's say I want to remove those sub-arrays with identical key ["name"] . So the final result should look like this: $X = array( [0]=> array( ["rel"]=> 4 [
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