SHOW INDEX, SHOW INDEXES, SHOW KEYS

Warning

SingleStore 9.0 gives you the opportunity to preview, evaluate, and provide feedback on new and upcoming features prior to their general availability. In the interim, SingleStore 8.9 is recommended for production workloads, which can later be upgraded to SingleStore 9.0.

Syntax

SQL

SHOW {INDEX | INDEXES | KEYS}
{FROM | IN} tbl_name
[{FROM | IN} db_name]
[WHERE expr]

Remarks

tbl_name - name of a table in a SingleStore database.
db_name - name of a SingleStore database. If not specified, then the currently open database is used.
expr - SQL WHERE expression.
The Key_name for shard keys on columnstore tables is listed as "__SHARDKEY" in the SHOW INDEX, SHOW INDEXES, or SHOW KEYS output.
The Index_type for shard keys on columnstore tables is listed at "METADATA_ONLY" in the SHOW INDEX, SHOW INDEXES, or SHOW KEYS output.
This command must be run on the master aggregator or a child aggregator node (see Node Requirements for SingleStore Commands).

Output

Column	Description
`Table`	Table name
`Non_unique`	Non-unique
`Key_name`	Key name
`Seq_in_index`	Sequence in the index
`Column_name`	Column name
`Collation`	Collation
`Cardinality`	Cardinality
`Sub_part`	Sub-part
`Packed`	Packed
`Null`	Null
`Index_type`	Index type (see Index)
`Comment`	Comment
`Index_comment`	Comment

Example

SQL

SHOW INDEX IN mytbl;

+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name  | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| mytbl |          1 | seq       |            1 | seq         | NULL      |        NULL |     NULL | NULL   | YES  | BTREE      |         |               |
| mytbl |          1 | seq_index |            1 | seq         | NULL      |        NULL |     NULL | NULL   | YES  | BTREE      |         |               |
+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

SQL

SHOW INDEXES IN mytbl;

+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name  | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| mytbl |          1 | seq       |            1 | seq         | NULL      |        NULL |     NULL | NULL   | YES  | BTREE      |         |               |
| mytbl |          1 | seq_index |            1 | seq         | NULL      |        NULL |     NULL | NULL   | YES  | BTREE      |         |               |
+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

SQL

SHOW KEYS in mytbl;

+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name  | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| mytbl |          1 | seq       |            1 | seq         | NULL      |        NULL |     NULL | NULL   | YES  | BTREE      |         |               |
| mytbl |          1 | seq_index |            1 | seq         | NULL      |        NULL |     NULL | NULL   | YES  | BTREE      |         |               |
+-------+------------+-----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

SQL

SHOW INDEXES in my_columnstore_tbl;

+--------------------+------------+------------+--------------+-------------+-----------+-------------+----------+--------+------+---------------+----------+---------------+
| Table              | Non_unique | Key_name   | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type    | Comment  | Index_comment | 
+--------------------+------------+------------+--------------+-------------+-----------+-------------+----------+--------+------+---------------+----------+---------------+
| my_columnstore_tbl |          1 | __SHARDKEY |            1 | a           | NULL      |        NULL |     NULL | NULL   | YES  | METADATA_ONLY |          |               |
+--------------------+------------+------------+--------------+-------------+-----------+-------------+----------+--------+------+---------------+----------+---------------+