SQL Exercise: Number of goals Germany scored at the tournament
17. From the following tables, write a SQL query to find the number of goals Germany scored at the tournament.
Sample table: goal_details
goal_id | match_no | player_id | team_id | goal_time | goal_type | play_stage | goal_schedule | goal_half
---------+----------+-----------+---------+-----------+-----------+------------+---------------+-----------
1 | 1 | 160159 | 1207 | 57 | N | G | NT | 2
2 | 1 | 160368 | 1216 | 65 | P | G | NT | 2
3 | 1 | 160154 | 1207 | 89 | N | G | NT | 2
4 | 2 | 160470 | 1221 | 5 | N | G | NT | 1
5 | 3 | 160547 | 1224 | 10 | N | G | NT | 1
6 | 3 | 160403 | 1218 | 61 | N | G | NT | 2
7 | 3 | 160550 | 1224 | 81 | N | G | NT | 2
8 | 4 | 160128 | 1206 | 73 | N | G | NT | 2
9 | 4 | 160373 | 1217 | 93 | N | G | ST | 2
10 | 5 | 160084 | 1204 | 41 | N | G | NT | 1
11 | 6 | 160298 | 1213 | 51 | N | G | NT | 2
12 | 7 | 160183 | 1208 | 19 | N | G | NT | 1
13 | 7 | 160180 | 1208 | 93 | N | G | ST | 2
14 | 8 | 160423 | 1219 | 87 | N | G | NT | 2
15 | 9 | 160335 | 1215 | 48 | N | G | NT | 2
16 | 9 | 160327 | 1215 | 71 | O | G | NT | 2
17 | 10 | 160244 | 1211 | 32 | N | G | NT | 1
18 | 10 | 160252 | 1211 | 93 | N | G | ST | 2
19 | 11 | 160207 | 1209 | 62 | N | G | NT | 2
20 | 11 | 160200 | 1209 | 87 | N | G | NT | 2
21 | 12 | 160320 | 1214 | 31 | N | G | NT | 1
22 | 12 | 160221 | 1210 | 50 | N | G | NT | 2
23 | 13 | 160411 | 1218 | 32 | N | G | NT | 1
24 | 13 | 160405 | 1218 | 45 | N | G | NT | 1
25 | 13 | 160380 | 1217 | 80 | N | G | NT | 2
26 | 14 | 160368 | 1216 | 18 | P | G | NT | 1
27 | 14 | 160481 | 1221 | 57 | N | G | NT | 2
28 | 15 | 160160 | 1207 | 90 | N | G | NT | 2
29 | 15 | 160154 | 1207 | 96 | N | G | ST | 2
30 | 16 | 160547 | 1224 | 42 | N | G | NT | 1
31 | 16 | 160138 | 1206 | 56 | N | G | NT | 2
32 | 16 | 160137 | 1206 | 93 | N | G | ST | 2
33 | 17 | 160262 | 1212 | 49 | N | G | NT | 2
34 | 17 | 160275 | 1212 | 96 | N | G | ST | 2
35 | 19 | 160248 | 1211 | 88 | N | G | NT | 2
36 | 20 | 160085 | 1204 | 37 | N | G | NT | 1
37 | 20 | 160086 | 1204 | 59 | N | G | NT | 2
38 | 20 | 160115 | 1205 | 76 | N | G | NT | 2
39 | 20 | 160114 | 1205 | 89 | P | G | NT | 2
40 | 21 | 160435 | 1219 | 34 | N | G | NT | 1
41 | 21 | 160436 | 1219 | 37 | N | G | NT | 1
42 | 21 | 160435 | 1219 | 48 | N | G | NT | 2
43 | 22 | 160067 | 1203 | 48 | N | G | NT | 2
44 | 22 | 160064 | 1203 | 61 | N | G | NT | 2
45 | 22 | 160067 | 1203 | 70 | N | G | NT | 2
46 | 23 | 160224 | 1210 | 40 | P | G | NT | 1
47 | 23 | 160216 | 1210 | 88 | O | G | NT | 2
48 | 25 | 160023 | 1201 | 43 | N | G | NT | 1
49 | 27 | 160544 | 1224 | 11 | N | G | NT | 1
50 | 27 | 160538 | 1224 | 20 | N | G | NT | 1
51 | 27 | 160547 | 1224 | 67 | N | G | NT | 2
52 | 29 | 160287 | 1213 | 54 | N | G | NT | 2
53 | 30 | 160182 | 1208 | 30 | N | G | NT | 1
54 | 31 | 160504 | 1222 | 10 | N | G | NT | 1
55 | 31 | 160500 | 1222 | 65 | N | G | NT | 2
56 | 32 | 160435 | 1219 | 7 | N | G | NT | 1
57 | 32 | 160089 | 1204 | 45 | N | G | NT | 1
58 | 32 | 160085 | 1204 | 87 | N | G | NT | 2
59 | 33 | 160226 | 1210 | 18 | N | G | NT | 1
60 | 33 | 160042 | 1202 | 60 | N | G | NT | 2
61 | 33 | 160226 | 1210 | 94 | N | G | ST | 2
62 | 34 | 160203 | 1209 | 19 | N | G | NT | 1
63 | 34 | 160320 | 1214 | 42 | N | G | NT | 1
64 | 34 | 160202 | 1209 | 47 | N | G | NT | 2
65 | 34 | 160322 | 1214 | 50 | N | G | NT | 2
66 | 34 | 160202 | 1209 | 55 | N | G | NT | 2
67 | 34 | 160322 | 1214 | 62 | N | G | NT | 2
68 | 35 | 160333 | 1215 | 85 | N | G | NT | 2
69 | 36 | 160063 | 1203 | 84 | N | G | NT | 2
70 | 37 | 160287 | 1213 | 39 | N | R | NT | 1
71 | 37 | 160476 | 1221 | 82 | N | R | NT | 2
72 | 38 | 160262 | 1212 | 75 | O | R | NT | 2
73 | 39 | 160321 | 1214 | 117 | N | R | ET | 2
74 | 40 | 160333 | 1215 | 2 | P | R | NT | 1
75 | 40 | 160160 | 1207 | 58 | N | R | NT | 2
76 | 40 | 160160 | 1207 | 61 | N | R | NT | 2
77 | 41 | 160165 | 1208 | 8 | N | R | NT | 1
78 | 41 | 160182 | 1208 | 43 | N | R | NT | 1
79 | 41 | 160173 | 1208 | 63 | N | R | NT | 2
80 | 42 | 160050 | 1203 | 10 | N | R | NT | 1
81 | 42 | 160065 | 1203 | 78 | N | R | NT | 2
82 | 42 | 160062 | 1203 | 80 | N | R | NT | 2
83 | 42 | 160058 | 1203 | 90 | N | R | NT | 2
84 | 43 | 160236 | 1211 | 33 | N | R | NT | 1
85 | 43 | 160252 | 1211 | 91 | N | R | ST | 2
86 | 44 | 160136 | 1206 | 4 | P | R | NT | 1
87 | 44 | 160219 | 1210 | 6 | N | R | NT | 1
88 | 44 | 160230 | 1210 | 18 | N | R | NT | 1
89 | 45 | 160297 | 1213 | 2 | N | Q | NT | 1
90 | 45 | 160316 | 1214 | 33 | N | Q | NT | 1
91 | 46 | 160063 | 1203 | 13 | N | Q | NT | 1
92 | 46 | 160539 | 1224 | 31 | N | Q | NT | 1
93 | 46 | 160550 | 1224 | 55 | N | Q | NT | 2
94 | 46 | 160551 | 1224 | 86 | N | Q | NT | 2
95 | 47 | 160177 | 1208 | 65 | N | Q | NT | 2
96 | 47 | 160235 | 1211 | 78 | P | Q | NT | 2
97 | 48 | 160159 | 1207 | 12 | N | Q | NT | 1
98 | 48 | 160155 | 1207 | 20 | N | Q | NT | 1
99 | 48 | 160154 | 1207 | 43 | N | Q | NT | 1
100 | 48 | 160160 | 1207 | 45 | N | Q | NT | 1
101 | 48 | 160230 | 1210 | 56 | N | Q | NT | 2
102 | 48 | 160159 | 1207 | 59 | N | Q | NT | 2
103 | 48 | 160221 | 1210 | 84 | N | Q | NT | 2
104 | 49 | 160322 | 1214 | 50 | N | S | NT | 2
105 | 49 | 160320 | 1214 | 53 | N | S | NT | 2
106 | 50 | 160160 | 1207 | 47 | P | S | ST | 1
107 | 50 | 160160 | 1207 | 72 | N | S | NT | 2
108 | 51 | 160319 | 1214 | 109 | N | F | ET | 2
Sample table: soccer_country
country_id | country_abbr | country_name
------------+--------------+---------------------
1201 | ALB | Albania
1202 | AUT | Austria
1203 | BEL | Belgium
1204 | CRO | Croatia
1205 | CZE | Czech Republic
1206 | ENG | England
1207 | FRA | France
1208 | GER | Germany
1209 | HUN | Hungary
1210 | ISL | Iceland
1211 | ITA | Italy
1212 | NIR | Northern Ireland
1213 | POL | Poland
1214 | POR | Portugal
1215 | IRL | Republic of Ireland
1216 | ROU | Romania
1217 | RUS | Russia
1218 | SVK | Slovakia
1219 | ESP | Spain
1220 | SWE | Sweden
1221 | SUI | Switzerland
1222 | TUR | Turkey
1223 | UKR | Ukraine
1224 | WAL | Wales
1225 | SLO | Slovenia
1226 | NED | Netherlands
1227 | SRB | Serbia
1228 | SCO | Scotland
1229 | NOR | Norway
Sample Solution:
SQL Code:
-- Counting the number of player_id occurrences
SELECT COUNT(player_id)
-- Filtering by team_id
FROM goal_details
-- Subquery to find country_id of Germany
WHERE team_id=(
-- Selecting country_id of Germany
SELECT country_id
FROM soccer_country
WHERE country_name='Germany'
);
Sample Output:
count
-------
7
(1 row)
Code Explanation:
The said query in SQL that retrieves the number of goals scored by the German team in the goal_details table.
1. The COUNT function counts the number of rows in the goal_details table.
2. The WHERE clause filters the results to only include rows where the team_id matches the country_id of Germany.
3. The country_id of Germany is obtained from a subquery that selects it from the soccer_country table, using a filter on the country_name column.
Alternative Solution:
Using JOIN and Subquery:
-- Counting the number of occurrences of player_id
SELECT COUNT(gd.player_id)
-- Joining goal_details and soccer_country tables based on team_id and country_id respectively
FROM goal_details gd
JOIN soccer_country sc ON gd.team_id = sc.country_id
-- Filtering by country_name 'Germany'
WHERE sc.country_name = 'Germany';
Explanation:
This query uses a JOIN operation to connect the goal_details table with the soccer_country table based on team_id. It then filters the results to only include entries for Germany and counts the number of player_id.
Using EXISTS with Subquery:
-- Counting the number of occurrences of player_id
SELECT COUNT(player_id)
-- Selecting from the goal_details table
FROM goal_details gd
-- Checking for existence of records in soccer_country table
WHERE EXISTS (
-- Subquery to check for existence of country_name 'Germany' and matching team_id
SELECT 1
FROM soccer_country sc
WHERE sc.country_name = 'Germany'
AND sc.country_id = gd.team_id
);
Explanation:
This query uses the EXISTS keyword along with a subquery to check if there exists a country with the name Germany in the soccer_country table, and if the team_id in goal_details matches that country's country_id.
Using Scalar Subquery:
-- Selecting player_count as a subquery result
SELECT (
-- Counting the number of player_id occurrences
SELECT COUNT(player_id)
-- Filtering by team_id of Germany
FROM goal_details
WHERE team_id = (
-- Selecting country_id of Germany
SELECT country_id
FROM soccer_country
WHERE country_name = 'Germany'
)
) AS player_count;
Explanation:
This query uses a scalar subquery to directly retrieve the count of player_id from goal_details for the specified country (Germany). The result is aliased as player_count.
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Practice Online
Sample Database: soccer
Query Visualization:
Duration:
Rows:
Cost:
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