mysql - select the TOP N rows from a table - Stack Overflow
Feb 5, 2012 · SELECT * -- <-- pick any columns here from your table, if you wanna exclude the RowNumber FROM (SELECT ROW_NUMBER OVER(ORDER BY ID DESC) RowNumber, * FROM Reflow WHERE ReflowProcessID = somenumber) t WHERE RowNumber >= 20 AND RowNumber <= 40 MySQL:
How to get the top 10 values in postgresql? - Stack Overflow
Here is a solution which will return more than 10 rows if there are ties but you will get all the rows where some_value_column is technically in the top 10. select * from (select *, rank() over (order by some_value_column desc) as my_rank from mytable) subquery where my_rank <= 10
sql - How to Select Top 100 rows in Oracle? - Stack Overflow
With release 12.1, Oracle introduced "real" Top-N queries. Using the new FETCH FIRST... syntax, you can also use: SELECT * FROM ( SELECT id, client_id, create_time, ROW_NUMBER() OVER(PARTITION BY client_id ORDER BY create_time DESC) rn FROM order ) WHERE rn = 1 ORDER BY create_time desc FETCH FIRST 100 ROWS ONLY)
How to get feature importance in xgboost? - Stack Overflow
Jun 4, 2016 · Build the model from XGboost first. from xgboost import XGBClassifier, plot_importance model = XGBClassifier() model.fit(train, label)
What is the difference between bottom-up and top-down?
May 29, 2011 · Generally, the bottom-up approach uses the tabulation technique, while the top-down approach uses the recursion (with memorization) technique. But you can also have bottom-up and top-down approaches using recursion as shown below. Bottom-Up: Start with the base condition and pass the value calculated until now recursively. Generally, these are ...
Setting top and left CSS attributes - Stack Overflow
For some reason I'm unable to set the "top" and "left" CSS attributes using the following JavaScript. var div = document.createElement('div'); div.style.position = 'absolute'; div.style.top = 200;...
Using DISTINCT and TOP in the same query - Stack Overflow
I see this is an old question, but I can suggest a more elegant solution:. SELECT personDetails.* FROM ( SELECT TOP (10) personID personID FROM TableA GROUP BY personID --> use this instead of distinct ) AS distinctIds OUTER APPLY ( SELECT TOP (1) * --> fetch only one result matching personID FROM TableA WHERE TableA.personId = distinctIds.personID ) AS …
sql - How to select top N from a table - Stack Overflow
Mar 30, 2012 · I have to select the top 25 records from a table according to the column Num. There are two issues. First, the table is not sorted by Num. I know this can be resolved by using GROUP ORDER BY. Second, the number of the records in the table might be less than 25. Is there any way to perform this selection in just one SQL statement?
Evaluation & Calculate Top-N Accuracy: Top 1 and Top 5
Jun 7, 2016 · I have come across few (Machine learning-classification problem) journal papers mentioned about evaluate accuracy with Top-N approach. Data was show that Top 1 accuracy = 42.5%, and Top-5 accuracy = 72.5% in the same training, testing condition. I wonder how to calculate this percentage of top-1 and top-5?
How to generate a QR Code for Google Authenticator that …
Dec 30, 2015 · Warning: sharing your TOTP seed with third-parties breaks the very basic assumption of multi-factor authentication that the TOTP seed is secret. So, I'm aware of the documentation on this, foun...