命令
show create table game;
game是表名
在web管理中,请在sql标签中查,不要在query中执行.
show create table game;=== <Result of SELECT Command in Line 1> === TABLE CREATE TABLE ============================================ 'game' 'CREATE TABLE game (host_year INTEGER NOT NULL, event_code INTEGER NOT NULL, athlete_code INTEGER NOT NULL, stadium_code INTEGER NOT NULL, nation_code CHARACTER(3), medal CHARACTER(1), game_date DATE, CONSTRAINT pk_game_host_year_event_code_athlete_code PRIMARY KEY (host_year, event_code, athlete_code), CONSTRAINT fk_game_event_code FOREIGN KEY (event_code) REFERENCES event ON DELETE RESTRICT ON UPDATE RESTRICT, CONSTRAINT fk_game_athlete_code FOREIGN KEY (athlete_code) REFERENCES athlete ON DELETE RESTRICT ON UPDATE RESTRICT)'1 row selected.Current transaction has been committed.1 command(s) successfully processed.
可以看到外键信息如
CONSTRAINT fk_game_event_code FOREIGN KEY (event_code) REFERENCES event ON DELETE RESTRICT ON UPDATE RESTRICT,
可以看到主键信息
CONSTRAINT pk_game_host_year_event_code_athlete_code PRIMARY KEY (host_year, event_code, athlete_code),
换个体位看索引 ,利用主键
SELECT * FROM db_index WHERE class_name = 'game' AND is_primary_key = 'YES';
