Select a random sample of results from a query result
Apr 9, 2009 · 77 This question asks about getting a random (ish) sample of records on SQL Server and the answer was to use TABLESAMPLE. Is there an equivalent in Oracle 10? If …
Generate 'n' unique random numbers within a range [duplicate]
Apr 3, 2014 · Using random.sample(xrange(1, 100), 3) - with xrange instead of range - speeds the code a lot, particularly if you have a big range, since it will only generate on-demand the …
Random Sample of a subset of a dataframe in Pandas
Nov 26, 2022 · 49 I have a pandas DataFrame with 100,000 rows and want to split it into 100 sections with 1000 rows in each of them. How do I draw a random sample of certain size (e.g. …
Best way to select random rows PostgreSQL - Stack Overflow
Dec 30, 2011 · I want a random selection of rows in PostgreSQL, I tried this: select * from table where random() < 0.01; But some other recommend this: select * from table order by random() …
What does the random.sample () method in Python do?
Mar 30, 2014 · I want to know the use of random.sample() method and what does it give? When should it be used and some example usage.
Select random sampling from sqlserver quickly - Stack Overflow
Mar 16, 2009 · 25 If you can use a pseudo-random sampling and you're on SQL Server 2005/2008, then take a look at TABLESAMPLE. For instance, an example from SQL Server …
Random Sampling in Google BigQuery - Stack Overflow
I just discovered that the RAND() function, while undocumented, works in BigQuery. I was able to generate a (seemingly) random sample of 10 words from the Shakespeare dataset using: …
Simple Random Samples from a MySQL Sql database
How do I take an efficient simple random sample in SQL? The database in question is running MySQL; my table is at least 200,000 rows, and I want a simple random sample of about …
python - A weighted version of random.choice - Stack Overflow
This is so much faster than numpy.random.choice . Picking from a list of 8 weighted items 10,000 times, numpy.random.choice took 0.3286 sec where as random.choices took 0.0416 sec, …
r - Sample random rows in dataframe - Stack Overflow
The answer John Colby gives is the right answer. However if you are a dplyr user there is also the answer sample_n: sample_n(df, 10) randomly samples 10 rows from the dataframe. It calls …