mysql create non unique index code example

Example 1: mysql remove unique constraint

ALTER TABLE tbl_name DROP INDEX index_name

Example 2: mysql set field unique

ALTER TABLE mytbl ADD UNIQUE (columnName);

Example 3: how to create index mysql

# index_name will identify your index for future reference
CREATE INDEX index_name ON table_name (column_name);

Example 4: create index mysql

create index your_index_name on your_table_name(your_column_name) using HASH;
or
create index your_index_name on your_table_name(your_column_name) using BTREE;