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MySQL: how to combine multiple SELECT queries using different WHERE criteria in one table?

I tried many different ways to solve this problem from this forum and many others. I can not find a solution to this problem or any documentation that will give me a direct answer.

I wondered if you could take a look at it for me.

thanks

PROBLEM:

I have a database with the following tables participant_scores league rounds

Currently, I can display the scores of one round, one round at a time ... which is exactly what I want. But I also want to display the score that each participant received for all rounds. Let's say we have 2 rounds. I want the result on the results screen to look something like this:

 Currently viewing league 20, Round 1
 of 2:

 User Name |  Score   |  Total Score

 Tom       |   10     |    200

 James     |   50     |    300

- = = , .

Mysql . , 100 , - , .

→ league_participants_query (mysql)

    # FIELDS
    SELECT    
        participants.participant_id,                                          # ID - used for functions
        participants.participant_name,                                        # NAME
        participants.participant_gender,                                      # Participant info             
        classes.class_name,                                                   # Class name
        schools.school_name,                                                  # School name
        participant_scores.participant_score,                                 # Participant score
        participant_scores.participant_score_id



    # TABLES
    FROM         participant_scores, participants, classes, league_schools, schools, leagues, rounds    


    # filter leagues
    WHERE        leagues.league_id               =     51

    AND          rounds.league_id                =     51    # the current league we are viewing
    AND          rounds.round_id                 =     25    # the current round of the league we are viewing

    # filter league schools
    AND          participant_scores.round_id     =     25    # the current round of the league we are viewing

    # filter schools allowed
    AND          league_schools.league_id        =     51    # the current league we are viewing

    # Filter schools
    AND          schools.school_id               =     league_schools.school_id

    # Filter classes
    AND          classes.school_id               =     schools.school_id                                        
    AND          classes.year_group_id           =     leagues.year_group_id

    # Filter participants
    AND          participants.class_id           =     classes.class_id

    # Filter participant_scores
    AND          participant_scores.participant_id   =      participants.participant_id

    #Grouping
    GROUP BY     participants.participant_id
+5
1

, :

SELECT
  name,
  round,
  score,
  ( select sum( score ) from scores sc where sc.userid = users.userid ) total
FROM users INNER JOIN scores on users.userid = scores.scoreid

, .

:

SELECT
  participants.participant_id,
  participants.participant_name,
  participants.participant_gender,
  classes.class_name,
  schools.school_name,
  participant_scores.participant_score,
  participant_scores.participant_score_id,
  ( SELECT sum(participant_score) FROM participant_scores tbl_scores2
    WHERE tbl_scores2.participant_score_id = participants.participant_id ) total
FROM participant_scores, participants, classes,
  league_schools, schools, leagues, rounds
WHERE
  leagues.league_id = 51  AND
  rounds.league_id = 51  AND
  rounds.round_id = 25 AND
  participant_scores.round_id  = 25  AND
  league_schools.league_id = 51  AND
  schools.school_id = league_schools.school_id  AND
  classes.school_id = schools.school_id  AND
  classes.year_group_id = leagues.year_group_id  AND
  participants.class_id = classes.class_id  AND
  participant_scores.participant_id = participants.participant_id 
GROUP BY
  participants.participant_id

, , , . , - , .

+7

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