[HIVEMALL-131] Add documentation about Stratified Sampling in general tips

• Type: Sub-task
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Assignee: Makoto Yui
• Reporter: Makoto Yui
• Created: 11/Jul/17 05:56
• Updated: 11/Jul/17 05:57

Description

Stratified Sampling using SQL is valuable and should be documented.

https://gist.github.com/myui/649c08cd2fb951e94eb4fa215eaf9df2
https://stackoverflow.com/questions/30235542/sql-random-sample-with-groups