row-number | 易学教程

How do I get a SQL row_number equivalent for a Spark RDD?

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I need to generate a full list of row_numbers for a data table with many columns. In SQL, this would look like this: select key_value, col1, col2, col3, row_number() over (partition by key_value order by col1, col2 desc, col3) from temp ; Now, let's say in Spark I have an RDD of the form (K, V), where V=(col1, col2, col3), so my entries are like (key1, (1,2,3)) (key1, (1,4,7)) (key1, (2,2,3)) (key2, (5,5,5)) (key2, (5,5,9)) (key2, (7,5,5)) etc. I want to order these using commands like sortBy(), sortWith(), sortByKey(), zipWithIndex, etc. and have a new RDD with the correct row_number (key1,

Equivalent of Oracle's RowID in SQL Server

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What's the equivalent of Oracle's RowID in SQL Server? From the Oracle docs ROWID Pseudocolumn For each row in the database, the ROWID pseudocolumn returns the address of the row. Oracle Database rowid values contain information necessary to locate a row: The data object number of the object The data block in the datafile in which the row resides The position of the row in the data block (first row is 0) The datafile in which the row resides (first file is 1). The file number is relative to the tablespace. The closest equivalent to this in SQL Server is the rid which has three components File

Select specific row from mysql table

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问题 Ideally I need a query that is equivalent to select * from customer where row_number() = 3 but that's illegal. I can't use an auto incremented field. row_number() is the row that needs to be selected. How do I go about this? EDIT: Well, I use iSql*plus to practice, and using limit and auto_increment is illegal for some reason. I ended up creating a sequence and a trigger and just upped the id by 1 every time there was an entry. 回答1: You can use LIMIT 2,1 instead of WHERE row_number() = 3 . As

ROW_NUMBER() equivalent in MySQL for inserting [duplicate]

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问题 This question already has answers here : ROW_NUMBER() in MySQL (24 answers) Closed 6 years ago . i'm trying to convert SQL scripts that was created in Microsoft SQL Server to run with a link sever to scripts that can be used in SQL Procedures, the script i'm on uses ROW_NUMBER() OVER(ORDER BY [FIELDS]) to create a primary key that isn't dependent on Auto Increment, when i try and save the code as a Procedure i get this error ERROR 1064 (42000): You have an error in your SQL syntax: check the

How to get RowNumber() with Partition in MYSQL

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问题 RowNumber() with Partition in MYSQL i want the below output based on id-Foreign key id | Name | rownumber 1 a 1 1 b 2 1 ads 3 2 dsfs 1 2 sadf 2 2 sdfsa 3 2 dfsfs 4 3 dsf 1 3 adsf 2 3 sdd 3 回答1: I barely understood what you mean. There's no RowNumber() function in mysql, and partitioning has nothing to do with your request. It's: SELECT t.*, @cur:= IF(id=@id, @cur+1, 1) AS RowNumber, @id := id FROM t CROSS JOIN (SELECT @id:=(SELECT MIN(id) FROM t), @cur:=0) AS init ORDER BY t.id 回答2: @Alma Du,

How to use ROW_NUMBER in sqlite

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Here is my query given below. select * from data where value = "yes"; My id is auto increment and below there is result of given query. id || value 1 || yes 3 || yes 4 || yes 6 || yes 9 || yes How to use ROW_NUMBER in sqlite? So that i can get result which is given below. NoId || value 1 || yes 2 || yes 3 || yes 4 || yes 5 || yes ROW_NUMBER AS NoId. Try this query select id, value, (select count(*) from tbl b where a.id >= b.id) as cnt from tbl a FIDDLE | id | value | cnt | -------------------- | 1 | yes | 1 | | 3 | yes | 2 | | 4 | yes | 3 | | 6 | yes | 4 | | 9 | yes | 5 | Lukasz Szozda SQLite

Add numbers to the beginning of every line in a file

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问题 How can I add numbers to the beginning of every line in a file? E.g.: This is the text from the file. Becomes: 000000001 This is 000000002 the text 000000003 from the file. 回答1: AWK's printf , NR and $0 make it easy to have precise and flexible control over the formatting: ~ $ awk '{printf("%010d %s\n", NR, $0)}' example.txt 0000000001 This is 0000000002 the text 0000000003 from the file. 回答2: Don't use cat or any other tool which is not designed to do that. Use the program: nl - number lines

Oracle 'Partition By' and 'Row_Number' keyword

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问题 I have a SQL query written by someone else and I\'m trying to figure out what it does. Can someone please explain what the Partition By and Row_Number keywords does here and give a simple example of it in action, as well as why one would want to use it? An example of partition by: (SELECT cdt.*, ROW_NUMBER () OVER (PARTITION BY cdt.country_code, cdt.account, cdt.currency ORDER BY cdt.country_code, cdt.account, cdt.currency) seq_no FROM CUSTOMER_DETAILS cdt); I\'ve seen some examples online,

Access query producing results like ROW_NUMBER() in T-SQL

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问题 Do we have ROW_NUMBER function in MS Access? If it has then please let me know any syntax for it as I am stuck here. I have tried forums but I get sql server syntax. Following is my query: select ROW_NUMBER() OVER (ORDER BY t.TID) AS uni , t.TSource as [Source], t.TText as [Text], u.Name as [UserId], u.Image_Url as [ImageFilePath], from table1 t inner join table2 u on t.UserId = u.UIds but it gives syntax error. 回答1: In Access SQL we can sometimes use a self-join to produce a rank order. For

How do I use ROW_NUMBER()?

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问题 I want to use the ROW_NUMBER() to get... To get the max(ROW_NUMBER()) --> Or i guess this would also be the count of all rows I tried doing: SELECT max(ROW_NUMBER() OVER(ORDER BY UserId)) FROM Users but it didn\'t seem to work... To get ROW_NUMBER() using a given piece of information, ie. if I have a name and I want to know what row the name came from. I assume it would be something similar to what I tried for #1 SELECT ROW_NUMBER() OVER(ORDER BY UserId) From Users WHERE UserName=\'Joe\' but