-- https://dev.mysql.com/doc/refman/8.0/en/drop-index.html

/* DROP INDEX index_name ON tbl_name
    [algorithm_option | lock_option] ...

algorithm_option:
    ALGORITHM [=] {DEFAULT | INPLACE | COPY}

lock_option:
    LOCK [=] {DEFAULT | NONE | SHARED | EXCLUSIVE} */


DROP INDEX `PRIMARY` ON t ALGORITHM = DEFAULT;
DROP INDEX `PRIMARY` ON t ALGORITHM = INPLACE;
DROP INDEX `PRIMARY` ON t ALGORITHM = COPY;
DROP INDEX `PRIMARY` ON t LOCK = DEFAULT;
DROP INDEX `PRIMARY` ON t LOCK = NONE;
DROP INDEX `PRIMARY` ON t LOCK = SHARED;
DROP INDEX `PRIMARY` ON t LOCK = EXCLUSIVE;

DROP INDEX `PRIMARY` ON t ALGORITHM DEFAULT;
DROP INDEX `PRIMARY` ON t ALGORITHM INPLACE;
DROP INDEX `PRIMARY` ON t ALGORITHM COPY;
DROP INDEX `PRIMARY` ON t LOCK DEFAULT;
DROP INDEX `PRIMARY` ON t LOCK NONE;
DROP INDEX `PRIMARY` ON t LOCK SHARED;
DROP INDEX `PRIMARY` ON t LOCK EXCLUSIVE;