Text contradiction - Advanced SQL Course

**Course**: Advanced SQL
**Lesson**: Writing Efficient Queries
**Section**: 2) Read less data

This section contains two issues in the text:

1. **Text Contradiction:** The sentence "By using only the columns with the station IDs, we scan less data" contradicts both the preceding sentence (which states IDs are not needed) and the less_data_query code (but it uses both station names).
2. **Mismatched Intro**: The intro sentence states "Both queries below calculate the average duration.", however, the code cell below it calculates the byte size instead of the time (duration).