rownum

问题 I have a table application and it has 10 columns. category is one column and this column has duplicated values. To get distinct values I have a query SELECT distinct(CATEGORY) as CategoryName FROM APPLICATION where applicationId=? . I am getting result without any issue. Here now I wanted to add a another column as categoryId. There is no such field, I have to generate one. I tried with below query. SELECT distinct(CATEGORY) as CategoryName , rownum as categoryId FROM APPLICATION where

问题 Can someone help me to convert the sql string to Dax? row_number() p over (partition by date, customer, type order by day) enter image description here The row number is my desired output. 回答1: Assuming that your data looks like this table: Sample +------------+----------+---------+--------+ | Date | Customer | Product | Gender | +------------+----------+---------+--------+ | 01/01/2018 | 1234 | P2 | F | | 01/01/2018 | 1234 | P2 | M | | 03/01/2018 | 1235 | P1 | F | | 03/01/2018 | 1235 | P2 |

来源： https://stackoverflow.com/questions/62866089/randomly-choosing-a-row

来源： https://stackoverflow.com/questions/62866089/randomly-choosing-a-row

问题 I want to create a new column and populate the value of each row in that column with the row number. This could be achieved in oracle by doing this. alter table mytable add (myfield integer); update mytable set myfield = rownum; How would this be done in SYBASE ASE? 回答1: alter table mytable add id bigint identity not null That's all. There will be a column id in every row that contains a unique sequence number for that row. 回答2: create column table some_names (ID bigint not null primary key

问题 I'm using oracle to output line items in from a shopping app. Each item has a quantity field that may be greater than 1 and if it is, I'd like to return that row N times. Here's what I'm talking about for a table product_id, quanity 1, 3, 2, 5 And I'm looking a query that would return 1,3 1,3 1,3 2,5 2,5 2,5 2,5 2,5 Is this possible? I saw this answer for SQL Server 2005 and I'm looking for almost the exact thing in oracle. Building a dedicated numbers table is unfortunately not an option.

问题 SELECT instmax FROM (SELECT instmax ,rownum r FROM ( SELECT instmax FROM pswlinstmax ORDER BY instmax DESC NULLS LAST ) WHERE r = 2 ); After execution it's giving this error: ORA-00904: "R": invalid identifier 00904. 00000 - "%s: invalid identifier" *Cause: *Action: Error at Line: 39 Column: 8 why it's giving this error?? 回答1: Because aliases are not supported in the WHERE clause of the same query. So instead write your query like: SELECT instmax FROM (SELECT instmax ,rownum r FROM ( SELECT

问题 I am encountering a problem, I had done a function that the data can be loaded by detecting scrolling position, the function was made with a SQL statement "Rownum", it only works in Oracle, but not in ACCESS. I would like to query the data and resort it ID value 1 aa 3 bb with Rownum we can do like this NID ID value 1 1 aa 2 3 bb how can I write a SQL statement with Microsoft ACCESS 回答1: Access does not support that function. If your ID field is a numeric primary key, you can include a field

问题 How to add an offset in a "select" query in Oracle 11g. I only know how to add the limit by e.g rownum <= 5 this question is not a duplicate, I already checked the other questions and are not related to mine. So, how to add the offset in Oracle 11g ? 回答1: You can do it easily on 12c by specifying OFFSET . In 12c , SELECT val FROM table ORDER BY val OFFSET 4 ROWS FETCH NEXT 4 ROWS ONLY; To do the same on 11g and prior, you need to use ROWNUM twice, inner query and outer query respectively. The

问题 So I want to select a range of rows in an Oracle DB. I need to do this because I have millions of rows in the table and I want to paginate results to the user (if you know another way to do this on the client side, I'm using JavaFX if it matters but I don't think it's a good idea to send all the datas over the network to paginate them on the client side). So after reading this post: SQL ROWNUM how to return rows between a specific range, I have the following query: Select * From (Select t.*,