Find standard deviation and variance of a column

Question

Hello,
How do I find variance and standard deviation of a column in a database?
For my project, I have to compute normal distribution on each column of a data base. I have tried looking around but can't find any helpful solutions to this problem.
Now, I am not very familiar with normal distribution either, so any help would be much appreciated and valuable.

How do I approach this problem ? I'm using c# in .NET and Mysql database.


Thank you.