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SQL Exercise: Within each half of play, find the number of bookings

SQL soccer Database: Exercise-27 with Solution

27. From the following table, write a SQL query to count the number of bookings in each half of play within the normal play schedule. Return play_half, play_schedule, number of booking happened.

Sample table: player_booked
 match_no | team_id | player_id | booking_time | sent_off | play_schedule | play_half
----------+---------+-----------+--------------+----------+---------------+-----------
        1 |    1216 |    160349 |           32 |          | NT            |         1
        1 |    1216 |    160355 |           45 |          | NT            |         1
        1 |    1207 |    160159 |           69 | Y        | NT            |         2
        1 |    1216 |    160360 |           78 |          | NT            |         2
        2 |    1221 |    160470 |           14 |          | NT            |         1
        2 |    1201 |    160013 |           23 |          | NT            |         1
        2 |    1201 |    160013 |           36 |          | NT            |         1
        2 |    1201 |    160014 |           63 |          | NT            |         2
        2 |    1221 |    160472 |           66 |          | NT            |         2
        2 |    1201 |    160015 |           89 |          | NT            |         2
        2 |    1201 |    160009 |           93 |          | NT            |         2
        3 |    1218 |    160401 |            2 |          | ST            |         2
        3 |    1218 |    160406 |           31 |          | NT            |         1
        3 |    1218 |    160408 |           78 |          | NT            |         2
        3 |    1218 |    160411 |           80 |          | NT            |         2
        3 |    1218 |    160407 |           83 |          | NT            |         2
        4 |    1206 |    160120 |           62 |          | NT            |         2
        4 |    1217 |    160377 |           72 |          | NT            |         2
        5 |    1222 |    160505 |           31 |          | NT            |         1
        5 |    1222 |    160490 |           48 |          | NT            |         2
        5 |    1204 |    160077 |           80 |          | NT            |         2
        5 |    1222 |    160502 |           91 |          | NT            |         2
        6 |    1213 |    160290 |           65 |          | NT            |         2
        6 |    1212 |    160258 |           69 |          | NT            |         2
        6 |    1213 |    160284 |           89 |          | NT            |         2
        7 |    1223 |    160518 |           68 |          | NT            |         2
        8 |    1205 |    160100 |           61 |          | NT            |         2
        9 |    1215 |    160336 |           43 |          | NT            |         1
        9 |    1220 |    160445 |           61 |          | NT            |         2
        9 |    1215 |    160341 |           77 |          | NT            |         2
       10 |    1211 |    160236 |           65 |          | NT            |         2
       10 |    1211 |    160248 |           75 |          | NT            |         2
       10 |    1211 |    160235 |           78 |          | NT            |         2
       10 |    1211 |    160245 |           84 |          | NT            |         2
       10 |    1203 |    160057 |           93 |          | NT            |         2
       11 |    1202 |    160027 |           33 |          | NT            |         1
       11 |    1202 |    160027 |           66 | Y        | NT            |         2
       11 |    1209 |    160204 |           80 |          | NT            |         2
       12 |    1210 |    160227 |            2 |          | ST            |         2
       12 |    1210 |    160221 |           55 |          | NT            |         2
       13 |    1218 |    160395 |           46 |          | NT            |         2
       14 |    1221 |    160480 |            2 |          | ST            |         2
       14 |    1216 |    160361 |           22 |          | NT            |         1
       14 |    1216 |    160357 |           24 |          | NT            |         1
       14 |    1216 |    160367 |           37 |          | NT            |         1
       14 |    1221 |    160477 |           50 |          | NT            |         2
       14 |    1216 |    160352 |           76 |          | NT            |         2
       15 |    1201 |    160015 |           55 |          | NT            |         2
       15 |    1201 |    160011 |           81 |          | NT            |         2
       15 |    1207 |    160152 |           88 |          | NT            |         2
       16 |    1224 |    160535 |           61 |          | NT            |         2
       17 |    1223 |    160528 |           40 |          | NT            |         1
       17 |    1212 |    160272 |           63 |          | NT            |         2
       17 |    1223 |    160523 |           67 |          | NT            |         2
       17 |    1212 |    160266 |           87 |          | NT            |         2
       17 |    1212 |    160259 |           90 |          | NT            |         2
       18 |    1208 |    160175 |            3 |          | NT            |         1
       18 |    1213 |    160294 |            3 |          | ST            |         2
       18 |    1208 |    160177 |           34 |          | NT            |         1
       18 |    1213 |    160293 |           45 |          | NT            |         1
       18 |    1213 |    160288 |           55 |          | NT            |         2
       18 |    1208 |    160165 |           67 |          | NT            |         2
       19 |    1211 |    160242 |           69 |          | NT            |         2
       19 |    1220 |    160447 |           89 |          | NT            |         2
       19 |    1211 |    160231 |           94 |          | NT            |         2
       20 |    1204 |    160080 |           14 |          | NT            |         1
       20 |    1205 |    160101 |           72 |          | NT            |         2
       20 |    1204 |    160081 |           74 |          | NT            |         2
       20 |    1204 |    160078 |           88 |          | NT            |         2
       21 |    1219 |    160424 |            2 |          | NT            |         1
       21 |    1222 |    160504 |            9 |          | NT            |         1
       21 |    1222 |    160500 |           41 |          | NT            |         1
       22 |    1215 |    160334 |           42 |          | NT            |         1
       22 |    1203 |    160056 |           49 |          | NT            |         2
       23 |    1209 |    160199 |            2 |          | ST            |         2
       23 |    1210 |    160229 |           42 |          | NT            |         1
       23 |    1210 |    160227 |           75 |          | NT            |         2
       23 |    1210 |    160216 |           77 |          | NT            |         2
       23 |    1209 |    160192 |           81 |          | NT            |         2
       23 |    1209 |    160197 |           83 |          | NT            |         2
       24 |    1202 |    160028 |            6 |          | NT            |         1
       24 |    1214 |    160321 |           31 |          | NT            |         1
       24 |    1214 |    160307 |           40 |          | NT            |         1
       24 |    1202 |    160037 |           47 |          | NT            |         2
       24 |    1202 |    160029 |           78 |          | NT            |         2
       24 |    1202 |    160042 |           86 |          | NT            |         2
       25 |    1201 |    160012 |            6 |          | NT            |         1
       25 |    1216 |    160353 |           54 |          | NT            |         2
       25 |    1201 |    160017 |           85 |          | NT            |         2
       25 |    1216 |    160356 |           85 |          | NT            |         2
       25 |    1216 |    160364 |           91 |          | NT            |         2
       25 |    1201 |    160007 |           95 |          | NT            |         2
       26 |    1207 |    160147 |           25 |          | NT            |         1
       26 |    1207 |    160145 |           83 |          | NT            |         2
       27 |    1224 |    160551 |           16 |          | NT            |         1
       27 |    1217 |    160383 |           64 |          | NT            |         2
       28 |    1218 |    160409 |           24 |          | NT            |         1
       28 |    1206 |    160119 |           52 |          | NT            |         2
       29 |    1223 |    160520 |           25 |          | NT            |         1
       29 |    1223 |    160513 |           38 |          | NT            |         1
       29 |    1213 |    160290 |           60 |          | NT            |         2
       31 |    1222 |    160491 |           35 |          | NT            |         1
       31 |    1205 |    160108 |           36 |          | NT            |         1
       31 |    1205 |    160107 |           39 | Y        | NT            |         1
       31 |    1222 |    160490 |           50 |          | NT            |         2
       31 |    1205 |    160112 |           87 |          | NT            |         2
       32 |    1204 |    160087 |           29 |          | NT            |         1
       32 |    1204 |    160079 |           70 |          | NT            |         2
       32 |    1204 |    160076 |           70 |          | NT            |         2
       32 |    1204 |    160085 |           88 |          | NT            |         2
       33 |    1210 |    160218 |           36 |          | NT            |         1
       33 |    1210 |    160230 |           51 |          | NT            |         2
       33 |    1202 |    160045 |           70 |          | NT            |         2
       33 |    1210 |    160220 |           78 |          | NT            |         2
       33 |    1210 |    160208 |           82 |          | NT            |         2
       34 |    1209 |    160190 |           13 |          | NT            |         1
       34 |    1209 |    160191 |           28 |          | NT            |         1
       34 |    1209 |    160203 |           34 |          | NT            |         1
       34 |    1209 |    160202 |           56 |          | NT            |         2
       35 |    1211 |    160233 |           39 |          | NT            |         1
       35 |    1215 |    160343 |           39 |          | NT            |         1
       35 |    1215 |    160332 |           73 |          | NT            |         2
       35 |    1211 |    160234 |           78 |          | NT            |         2
       35 |    1211 |    160253 |           87 |          | NT            |         2
       35 |    1211 |    160251 |           93 |          | NT            |         2
       36 |    1203 |    160064 |            1 |          | ST            |         1
       36 |    1203 |    160055 |           30 |          | NT            |         1
       36 |    1220 |    160451 |           72 |          | NT            |         2
       37 |    1221 |    160470 |           55 |          | NT            |         2
       37 |    1213 |    160282 |           58 |          | NT            |         2
       38 |    1212 |    160266 |           44 |          | NT            |         1
       38 |    1224 |    160538 |           58 |          | NT            |         2
       38 |    1212 |    160267 |           67 |          | NT            |         2
       38 |    1224 |    160544 |           92 |          | NT            |         2
       39 |    1214 |    160318 |           78 |          | NT            |         2
       40 |    1215 |    160328 |           25 |          | NT            |         1
       40 |    1207 |    160152 |           27 |          | NT            |         1
       40 |    1215 |    160334 |           41 |          | NT            |         1
       40 |    1207 |    160147 |           44 |          | NT            |         1
       40 |    1215 |    160329 |           66 | Y        | NT            |         2
       40 |    1215 |    160343 |           72 |          | NT            |         2
       41 |    1218 |    160407 |            2 |          | ST            |         2
       41 |    1218 |    160401 |           13 |          | NT            |         1
       41 |    1208 |    160169 |           46 |          | NT            |         2
       41 |    1208 |    160168 |           67 |          | NT            |         2
       42 |    1209 |    160192 |           34 |          | NT            |         1
       42 |    1209 |    160194 |           47 |          | NT            |         2
       42 |    1209 |    160196 |           61 |          | NT            |         2
       42 |    1203 |    160056 |           67 |          | NT            |         2
       42 |    1203 |    160065 |           89 |          | NT            |         2
       42 |    1203 |    160061 |           91 |          | NT            |         2
       42 |    1209 |    160207 |           92 |          | NT            |         2
       43 |    1219 |    160431 |            2 |          | ST            |         2
       43 |    1211 |    160238 |           24 |          | NT            |         1
       43 |    1219 |    160436 |           41 |          | NT            |         1
       43 |    1211 |    160252 |           54 |          | NT            |         2
       43 |    1211 |    160245 |           89 |          | NT            |         2
       43 |    1219 |    160427 |           89 |          | NT            |         2
       43 |    1219 |    160421 |           89 |          | NT            |         2
       44 |    1210 |    160208 |           38 |          | NT            |         1
       44 |    1206 |    160137 |           47 |          | NT            |         2
       44 |    1210 |    160222 |           65 |          | NT            |         2
       45 |    1214 |    160318 |            2 |          | ST            |         2
       45 |    1213 |    160282 |           42 |          | NT            |         1
       45 |    1213 |    160281 |           66 |          | NT            |         2
       45 |    1214 |    160310 |           70 |          | NT            |         2
       45 |    1213 |    160290 |           89 |          | NT            |         2
       46 |    1224 |    160535 |            5 |          | NT            |         1
       46 |    1224 |    160533 |           16 |          | NT            |         1
       46 |    1224 |    160536 |           24 |          | NT            |         1
       46 |    1203 |    160061 |           59 |          | NT            |         2
       46 |    1224 |    160544 |           75 |          | NT            |         2
       46 |    1203 |    160050 |           85 |          | NT            |         2
       47 |    1211 |    160247 |           56 |          | NT            |         2
       47 |    1211 |    160238 |           57 |          | NT            |         2
       47 |    1211 |    160246 |           59 |          | NT            |         2
       47 |    1208 |    160168 |           90 |          | NT            |         2
       47 |    1208 |    160180 |          112 |          | NT            |         2
       48 |    1210 |    160221 |           58 |          | NT            |         2
       48 |    1207 |    160149 |           75 |          | NT            |         2
       49 |    1224 |    160540 |            8 |          | NT            |         1
       49 |    1224 |    160533 |           62 |          | NT            |         2
       49 |    1214 |    160303 |           71 |          | NT            |         2
       49 |    1214 |    160322 |           72 |          | NT            |         2
       49 |    1224 |    160547 |           88 |          | NT            |         2
       50 |    1208 |    160177 |            1 |          | ST            |         1
       50 |    1208 |    160172 |           36 |          | NT            |         1
       50 |    1207 |    160143 |           43 |          | NT            |         1
       50 |    1208 |    160180 |           45 |          | NT            |         1
       50 |    1208 |    160173 |           50 |          | NT            |         2
       50 |    1207 |    160152 |           75 |          | NT            |         2
       51 |    1214 |    160304 |           34 |          | NT            |         1
       51 |    1214 |    160313 |           62 |          | NT            |         2
       51 |    1207 |    160149 |           80 |          | NT            |         2
       51 |    1214 |    160308 |           95 |          | ET            |         1
       51 |    1207 |    160153 |           97 |          | ET            |         1
       51 |    1214 |    160318 |           98 |          | ET            |         1
       51 |    1207 |    160145 |          107 |          | ET            |         2
       51 |    1207 |    160155 |          115 |          | ET            |         2
       51 |    1214 |    160306 |          119 |          | ET            |         2
       51 |    1214 |    160302 |          122 |          | ET            |         2

Sample Solution:

SQL Code:

-- This SQL query calculates the count of bookings for each play half and play schedule in the 'player_booked' table.

SELECT play_half, play_schedule, COUNT(*) 
-- Selects the 'play_half', 'play_schedule', and the count of rows for each group.
FROM player_booked
-- 'player_booked' is the name of the table being queried.
WHERE play_schedule='NT'
-- The WHERE clause filters rows where the 'play_schedule' column has the value 'NT'.
GROUP BY play_half, play_schedule;
-- Groups the results by 'play_half' and 'play_schedule'.

Sample Output:

 play_half | play_schedule | count
-----------+---------------+-------
         1 | NT            |    61
         2 | NT            |   123
(2 rows)

Code Explanation:

The said query in SQL will retrieve "play_half", "play_schedule", and number of players booked in normal time schedule from the 'player_booked' table.
The WHERE clause filter the rows where the value of "play_schedule" is equal to 'NT'
A GROUP BY groups the results by play_half, play_schedule columns.

Relational Algebra Expression:

Relational Algebra Expression: Find the number of booking happened in each half of play within normal play schedule.

Relational Algebra Tree:

Relational Algebra Tree: Find the number of booking happened in each half of play within normal play schedule.

Practice Online


Sample Database: soccer

soccer database relationship structure

Query Visualization:

Duration:

Query visualization of Find the number of booking happened in each half of play within normal play schedule - Duration

Rows:

Query visualization of Find the number of booking happened in each half of play within normal play schedule - Rows

Cost:

Query visualization of Find the number of booking happened in each half of play within normal play schedule - Cost

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Previous SQL Exercise: Find the number of penalty shots taken by the teams.
Next SQL Exercise: Find the number of booking happened in stoppage time.

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