add index mysql code example

Example 1: how to create index mysql

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

Example 2: 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;