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MySQL:
DROP INDEX
Syntax:
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 drops the index named index_name from the table tbl_name.
This statement is mapped to an ALTER TABLE statement to drop the index.
See [HELP ALTER TABLE].
To drop a primary key, the index name is always PRIMARY, which must be
specified as a quoted identifier because PRIMARY is a reserved word:
DROP INDEX `PRIMARY` ON t;
URL: https://dev.mysql.com/doc/refman/8.0/en/drop-index.html
Example
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