Oracle触发器错误-标识符无效

我有以下表格

create table player (
    player_id int,
    firstname varchar(32),
    lastname varchar(32),
    birthdate date,
    country varchar(3),
    constraint pk_player primary key (player_id)
);

create table team (
    team_id int, 
    name varchar(32),
    city_id int,
    manager_id int, 
    coach_id int,
    constraint pk_team primary key (team_id),
    constraint fk_team_city foreign key (city_id) 
        references city (city_id),
    constraint fk_team_manager foreign key (manager_id) 
        references manager (manager_id),
    constraint fk_team_coach foreign key (coach_id) 
        references coach (coach_id)
);

create table play_in_team (
    player_id int,
    team_id int,
    from_date date,
    to_date date,
    position varchar(5),
    squad_number int,
    is_captain char(1),
    constraint pk_play_in_team primary key (player_id, team_id, from_date),
    constraint fk_play_player foreign key (player_id) 
        references player (player_id),
    constraint fk_play_team foreign key (team_id) 
        references team (team_id)
);

create table violations (
    team_id int,
    violation_text varchar(200),
    constraint fk_vio_team foreign key (team_id) 
        references team (team_id)
);

我被分配了以下问题

创建一个触发器，该触发器将在每次 球队在任何时候都有不止一名队长。违反 信息应包括短语“违反-多个船长”，以及 船长的名字。您可以在每个字段中插入船长姓名对 违规信息

在编译触发器时，我总是遇到语法错误，希望有人能给我指出正确的方向。现在，我的触发器定义为

CREATE OR REPLACE TRIGGER one_captain_check
    AFTER INSERT OR UPDATE OF player_id, team_id, from_date, to_date, is_captain ON play_in_team
    FOR EACH ROW
        WHEN(new.is_captain = '1')
    BEGIN
        MERGE INTO violations
        USING (
            SELECT
                play_in_team.team_id,
                ('VIOLATION - Multiple Captains - ' || existing_captain.firstname || ' ' || existing_captain.lastname || ', ' || new_captain.firstname || ' ' || new_captain.lastname) "violation_text"
            FROM play_in_team
            JOIN player existing_captain
                ON existing_captain.player_id = play_in_team.player_id
            JOIN player new_captain
                ON new_captain.player_id = :new.player_id
            WHERE
                play_in_team.team_id = :new.team_id AND
                play_in_team.player_id != :new.player_id AND
                play_in_team.is_captain = '1' AND
                -- overlapping date ranges from http://tonyandrews.blogspot.com/2010/06/sql-overlap-test.html
                NVL(:new.to_date, from_date) >= from_date AND
                :new.from_date <= NVL(to_date, :new.from_date)
        ) new_violations
        ON (violations.team_id = new_violations.team_id AND violations.violation_text = new_violations.violation_text)
        WHEN NOT MATCHED THEN
            INSERT VALUES(new_violations.team_id, new_violations.violation_text);
    END;
/

当我尝试运行sqlplus时，我在sqlplus中遇到以下错误

行/列错误

2/3 PL/SQL:忽略SQL语句

20/83 PL/SQL:ORA-00904:新的\u冲突。冲突\u文本：无效标识符

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我不熟悉Oracle和PL/SQL，一直在尝试上述触发器的变体，但就是无法将其编译。我使用的是Oracle Database 11g Enterprise Edition 11.2.0.4.0版。你知道如何修复语法吗？

我这里没有安装Oracle来测试它-但是你能不能不要把违规文本放在第10行的引号内，或者把它放在引号内的大写字母内

Oracle默认情况下会将表名和列名中不在引号内的所有小写字母更改为大写，

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所以实际上你的专栏是新的违规。违规文本不等于新的违规。违规文本-这是新的违规。违规文本…

非常感谢。那是我的问题。一旦我将列别名大写，触发器就安装得很好。