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CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, <CUSTOM_INDEX> (a) ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW KEYS IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 a 1 a # # NULL NULL # BTREE DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, <CUSTOM_INDEX> a_b (a,b) COMMENT 'a_b index' ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW KEYS IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 a_b 1 a # # NULL NULL # BTREE a_b index t1 1 a_b 2 b # # NULL NULL # BTREE a_b index DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, <CUSTOM_INDEX> (a), <CUSTOM_INDEX> (b) ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW KEYS IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 a 1 a # # NULL NULL # BTREE t1 1 b 1 b # # NULL NULL # BTREE DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, UNIQUE INDEX (a) ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW KEYS IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 0 a 1 a # # NULL NULL # BTREE INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'); INSERT INTO t1 (a,b) VALUES (1,'c'); ERROR 23000: Duplicate entry '1' for key 'a' # Statement ended with one of expected results (ER_DUP_ENTRY,ER_DUP_KEY). # If you got a difference in error message, just add it to rdiff file DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; INSERT INTO t1 (a,b) VALUES (100,'z'); ALTER TABLE t1 ADD <CUSTOM_INDEX> (a) COMMENT 'simple index on a'; SHOW INDEX FROM t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 a 1 a # # NULL NULL # BTREE simple index on a ALTER TABLE t1 DROP KEY a; DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, UNIQUE INDEX (a) ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW KEYS IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 0 a 1 a # # NULL NULL # BTREE INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'); INSERT INTO t1 (a,b) VALUES (1,'c'); ERROR 23000: Duplicate entry '1' for key 'a' # Statement ended with one of expected results (ER_DUP_ENTRY,ER_DUP_KEY). # If you got a difference in error message, just add it to rdiff file ALTER TABLE t1 DROP INDEX a; INSERT INTO t1 (a,b) VALUES (1,'c'); ALTER TABLE t1 ADD UNIQUE INDEX a(a) ; ERROR 23000: Duplicate entry '1' for key 'a' # Statement ended with one of expected results (ER_DUP_ENTRY,ER_DUP_KEY). # If you got a difference in error message, just add it to rdiff file DROP TABLE t1;