January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Questions
- What is a CTE?
- Can one CTE use other CTEs?
- Can a CTE reference itself?
- How do we insert rows into several tables at once?
- Is there a way to specify the order of execution of CTEs?
- What is the difference between grouping and aggregation, and using window functions?
- How do we calculate a moving average of a field for each row, taking three rows before and three rows after?
- How do we calculate the difference between the value of a field in the current row and the average of the previous and the next rows for each row?
- Can window functions be combined with aggregating functions?
- What is the purpose of the DISTINCT ON clause?
- How do we get a sample of data from a database table?
- How do we get a sequence of numbers using a SELECT query? ...
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