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create table t1(a blob , unique(a) using hash); show keys from t1;; Table t1 Non_unique 0 Key_name a Seq_in_index 1 Column_name a Collation A Cardinality NULL Sub_part NULL Packed NULL Null YES Index_type HASH Comment Index_comment Ignored NO drop table t1; create table t1(a blob , unique(a) using btree); ERROR 42000: Specified key was too long; max key length is 1000 bytes create table t1(a int , unique(a) using hash); show keys from t1;; Table t1 Non_unique 0 Key_name a Seq_in_index 1 Column_name a Collation A Cardinality NULL Sub_part NULL Packed NULL Null YES Index_type HASH Comment Index_comment Ignored NO drop table t1; create table t1(a int ,b int , c int, unique(a, b, c) using hash); show keys from t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored t1 0 a 1 a A NULL NULL NULL YES HASH NO t1 0 a 2 b A NULL NULL NULL YES HASH NO t1 0 a 3 c A NULL NULL NULL YES HASH NO insert into t1 values(1,1,1); insert into t1 values(1,1,1); ERROR 23000: Duplicate entry '1-1-1' for key 'a' drop table t1; create table t1(a int ,b int , c int, unique(a, b, c) using hash) engine=memory; show keys from t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored t1 0 a 1 a NULL NULL NULL NULL YES HASH NO t1 0 a 2 b NULL NULL NULL NULL YES HASH NO t1 0 a 3 c NULL 0 NULL NULL YES HASH NO insert into t1 values(1,1,1); insert into t1 values(1,1,1); ERROR 23000: Duplicate entry '1-1-1' for key 'a' drop table t1;