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Q.8 Write a python program to plot two or more lines with different styles. Q.9 Given a dataframe df as shown below: ... A line chart from the 1990 and 2000 columns of dataframe df1. Create a bar chart plotting the three columns of dataframe df1. CHAPTER-4. ... Can a table have multiple primary keys? Can it have multiple foreign keys? 3. In a ... ................
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