What tools do employers want data scientists to know ?

« You find yourself overwhelmed with all the various tools mentioned in data science forums.
You were hoping MATLAB would be enough, but you are inundated with advice of how to get started.
You get advice to learn and practice R. Then you should learn Python. Then you should learn SQL. Then you should learn SPSS.
Then you should learn Excel. Then you should learn Rapid Miner. Then you should learn Open Refine.
Then you should learn IPython. Then you should learn D3.js. Then you should learn Hadoop.
Then you should learn Data Wrangler. Then you should learn Pandas. Then you should… It just doesn’t stop. « 

https://www.datascienceweekly.org/articles/what-tools-do-employers-want-data-scientists-to-know