/* To Drop Unique Key Constraint*/
ALTER TABLE Table_Name
DROP CONSTRAINT Constraint_Name
SHOW CREATE TABLE [tableName]
-- Find the constraintID after CONSTRAINT 'constraintID'
ALTER TABLE [tableName] DROP FOREIGN KEY constraintID
DROP INDEX index_name ON table_name;
OR
ALTER TABLE table_name DROP INDEX index_name;
DROP INDEX index_name ON table_name;
OR
ALTER TABLE table_name DROP INDEX index_name;
DROP INDEX index_name ON table_name;
OR
ALTER TABLE table_name DROP INDEX index_name;
DROP INDEX index_name ON table_name;
OR
ALTER TABLE table_name DROP INDEX index_name;