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-- создание типа данных SERIAL -- создаются два индекса - первичный и вторичный уникальный CREATE TABLE t1 (id SERIAL PRIMARY KEY); SHOW CREATE TABLE t1; CREATE TABLE t2 (id SERIAL, PRIMARY KEY (id)); SHOW CREATE TABLE t2; -- использование модификатора SERIAL для типа INTEGER -- !!! создаётся таблица с автоинкрементом, но без первичного ключа. CREATE TABLE t3 (id INT SERIAL DEFAULT VALUE); SHOW CREATE TABLE t3; CREATE TABLE t4 (id INT UNSIGNED SERIAL DEFAULT VALUE); SHOW CREATE TABLE t4; CREATE TABLE t5 (id SERIAL, val INT, INDEX(id, val)); SHOW CREATE TABLE t5; ALTER TABLE t5 DROP INDEX id; SHOW CREATE TABLE t5;

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