In this lab we will query data from a table populated with Babe Ruth's career hitting statistics. We will use aggregate functions to pull interesting information from the table that basic queries cannot track. We will discover many interesting facts about Babe Ruth, like his total career home runs and his most home runs in one season.
- Write queries with aggregate functions like
COUNT
,MAX
,MIN
, andSUM
- Create an alias for the return value of an aggregate function
- Use
GROUP BY
to sort the data sets returned by aggregate functions - Compare aggregates using the
HAVING
clause
We will query from the babe_ruth_stats
table featured below.
year | team | league | doubles | triples | hits | HR | games | runs | RBI | at_bats | BB | SB | SO | AVG |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1914 | "BOS" | "AL" | 1 | 0 | 2 | 0 | 5 | 1 | 2 | 10 | 0 | 0 | 4 | 0.2 |
1915 | "BOS" | "AL" | 10 | 1 | 29 | 4 | 42 | 16 | 21 | 92 | 9 | 0 | 23 | 0.315 |
1916 | "BOS" | "AL" | 5 | 3 | 37 | 3 | 67 | 18 | 15 | 136 | 10 | 0 | 23 | 0.272 |
1917 | "BOS" | "AL" | 6 | 3 | 40 | 2 | 52 | 14 | 12 | 123 | 12 | 0 | 18 | 0.325 |
1918 | "BOS" | "AL" | 26 | 11 | 95 | 11 | 95 | 50 | 66 | 317 | 58 | 6 | 58 | 0.3 |
1919 | "BOS" | "AL" | 34 | 12 | 139 | 29 | 130 | 103 | 114 | 432 | 101 | 7 | 58 | 0.322 |
1920 | "NY" | "AL" | 36 | 9 | 172 | 54 | 142 | 158 | 137 | 458 | 150 | 14 | 80 | 0.376 |
1921 | "NY" | "AL" | 44 | 16 | 204 | 59 | 152 | 177 | 171 | 540 | 145 | 17 | 81 | 0.378 |
1922 | "NY" | "AL" | 24 | 8 | 128 | 35 | 110 | 94 | 99 | 406 | 84 | 2 | 80 | 0.315 |
1923 | "NY" | "AL" | 45 | 13 | 205 | 41 | 152 | 151 | 131 | 522 | 170 | 17 | 93 | 0.393 |
1924 | "NY" | "AL" | 39 | 7 | 200 | 46 | 153 | 143 | 121 | 529 | 142 | 9 | 81 | 0.378 |
1925 | "NY" | "AL" | 12 | 2 | 104 | 25 | 98 | 61 | 66 | 359 | 59 | 2 | 68 | 0.29 |
1926 | "NY" | "AL" | 30 | 5 | 184 | 47 | 152 | 139 | 146 | 495 | 144 | 11 | 76 | 0.372 |
1927 | "NY" | "AL" | 29 | 8 | 192 | 60 | 151 | 158 | 164 | 540 | 137 | 7 | 89 | 0.356 |
1928 | "NY" | "AL" | 29 | 8 | 173 | 54 | 154 | 163 | 142 | 536 | 137 | 4 | 87 | 0.323 |
1929 | "NY" | "AL" | 26 | 6 | 172 | 46 | 135 | 121 | 154 | 499 | 72 | 5 | 60 | 0.345 |
1930 | "NY" | "AL" | 28 | 9 | 186 | 49 | 145 | 150 | 153 | 518 | 136 | 10 | 61 | 0.359 |
1931 | "NY" | "AL" | 31 | 3 | 199 | 46 | 145 | 149 | 163 | 534 | 128 | 5 | 51 | 0.373 |
1932 | "NY" | "AL" | 13 | 5 | 156 | 41 | 133 | 120 | 137 | 457 | 130 | 2 | 62 | 0.341 |
1933 | "NY" | "AL" | 21 | 3 | 138 | 34 | 137 | 97 | 103 | 459 | 114 | 4 | 90 | 0.301 |
1934 | "NY" | "AL" | 17 | 4 | 105 | 22 | 125 | 78 | 84 | 365 | 104 | 1 | 63 | 0.288 |
1935 | "BOS" | "NL" | 0 | 0 | 13 | 6 | 28 | 13 | 12 | 72 | 20 | 0 | 24 | 0.181 |
#Your code here
Counts the total number of year
s that Babe Ruth played professional baseball
#Your code here
Counts the total number of year
s played with the NY
Yankees
#Your code here
Selects the most HR
that Babe Ruth hit in one season
#Your code here
Select the least number of HR
hit in one season
#Your code here
Returns the total number of HR
hit by Babe Ruth during his career
#Your code here
Babe Ruth hit 0 HR
one year. That statistic might not be indicative of a typical Babe Ruth season if he played in only a handful of games that year. Let's figure out how many games he played that season. Select the year
and games
from the season in which Ruth hit 0 HR
.
#Your code here
We determined that Babe Ruth hit 0 home runs in his first year, when he played only five games. Let's avoid the outliers by looking at years in which Ruth played in at least 100 games. Select the year
with the least number of HR
from only those seasons with over 100 games
played.
#Your code here
Select the average, AVG
, of Ruth's batting averages. The header of the result would be AVG(AVG)
which is quite confusing, so provide an alias of career_average
.
#Your code here
Select the team
and the total number of year
s and hits
, but represent the results on a per team basis. (Hint: you will need to sort the result with a certain clause...)
#Your code here
The previous query returns Babe Ruth's Boston stats first. However, the overwhelming majority of Ruth's career statistics came when he played for the NY
Yankees. Shouldn't we list Ruth's NY
stats first? Write the previous query again, but this time we want Babe Ruth's total HR
s instead of his total hits
. Make sure that the resulting data set lists Babe Ruth's stats as a Yankee first.
Hint: You will need to chain another sorting clause after
GROUP BY
.
#Your code here
We want to know the years in which Ruth successfully reached base over 300 times. We need to add hits
and BB
to calculate how many times Ruth reached base. Simply add the two columns together (ie: SELECT hits + BB FROM ...
) and give this value an alias of on_base
. Select the year
and on_base
for only those years with an on_base
over 300.
#Your code here
Well done! In this lab we continued adding complexity to our SQL statements and wrote aggregate functions. We were able to build our queries from giving us totals and averages to showing us the total years and home runs earned by team as well as calculating Babe Ruth's total on base and then selecting only years that met a minimum value of our calculated on base attribute.