Question
a.
SELECT YEAR, avg(num credits)
OVER (ORDER BY YEAR ROWS 3 preceding) AS avg total credits
FROM tot credits;
b.
SELECT YEAR, avg(num credits)
OVER (ORDER BY YEAR ROWS 3 unbounded preceding) AS avg total credits
FROM tot credits;
c.
SELECT YEAR, MIN(num credits)
OVER (ORDER BY YEAR ROWS 3 unbounded preceding) AS avg total credits
FROM tot credits;
d.
SELECT YEAR, SUM(num credits)
OVER (ORDER BY YEAR ROWS 3 unbounded preceding) AS avg total credits
FROM tot credits;
Posted under SQL Server
OVER (ORDER BY YEAR ROWS 3 preceding) AS avg total credits
FROM tot credits;
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Q. Suppose we are given a view tot credits (year, num credits) giving the total number of credits taken by students in each year.The query that computes averages over the 3 preceding...
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