Which programming languages need to know for Big data or Data Science?

1. First of all need to know R Programming Language for Query from different Data Source.
2. Python Programming Language must require for Data Science or Big Data. You can use the Language for Data Analyst and Apache Spark.
3. Scala Programming Language is also require as Prerequisite of Apache Spark. The Language is like Java Programming Language. If you know Java then you will capture the Language easily. So that both Language (Scala and Python) are need to know for Apache Spark