Sequel is a simple, flexible, and powerful SQL database access toolkit for Ruby. Sequel provides thread safety, connection pooling and a concise DSL for constructing SQL queries and table schemas.
Read data from above file into dataframes (df1 and df2). Display number of partitions in df1. Create a new dataframe df3 from df1, along with a new column salary, and keep it constant 1000 append df2 ...
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