Do I need statistics in addition to an index?
Suppose I have a table with images that are supposed to go through several steps:
statistics
statistics on what queries were executed and how many times
I’d like to monitor how many times certain queries are executed. Take a look at the 3 queries below, the second and third are written as prepared statement.
How does SQL estimate the number of rows in a less than < Predicate
I have been doing some testing to try to better understand how SQL Server uses a histogram to estimate the number of rows that will match an equality predicate and also a < or > predicate
Is the effect of statistics update immediate or does sql server need to be restarted?
Index statistics are utilized by sql server to derive the best plan for query execution.
Is there a way to know if someone has bookmarked your website?
The question: I want to make stats for my website. One thing I want to do is to know how many people bookmark my website. What’s the best way to do that without a survey? The Solutions: Below are the methods you can try. The first solution is probably the best. Try others if the … Read more
Calculating the Median with Mysql
I’m having trouble with calculating the median of a list of values, not the average.
How to select standard deviation within a row? (in SQL – or R :)
I wonder whether there is a way to select the standard deviation from several integer fields in MySQL within the same row. Obviously, if I use
how to generate a gaussian distribution using mysql user-defined function
I like to use MySQL to do quantitative analysis and statistics.
I would like to make a MySQL user-defined function of the form:
sample_gaussian(mean, stdev) that returns a single randomized
value sampled from a gaussian distribution having mean and standard
deviation of the user-entered arguments. MySQL already has a
function rand() that returns a random number, so I just need to
know some pseudocode for constraining/transforming that value
so that it falls into the right distribution.
Any suggestions?
What statistics can be used to identify pseudorandom data?
I’m working on some code that attempts to identify files whose contents appear to be “random”. As such, I’m looking for statistical measures that can be used to identify such randomness.