SHOW DEFAULT SINGLE TABLE STORAGE UNIT [FROM databaseName]
    
SHOW SINGLE (TABLES | table) [FROM databaseName]
COUNT SINGLE_TABLE RULE [FROM databaseName]
table:
    TABLE tableName
| Column | Description | 
|---|---|
| storage_unit_name | Storage unit name | 
| Column | Description | 
|---|---|
| table_name | Single table name | 
| storage_unit_name | The storage unit where the single table is located | 
| Column | Description | 
|---|---|
| rule_name | Single table rule name | 
| database | The database name where the single table is located | 
| count | The count of single table rules | 
SHOW DEFAULT SINGLE TABLE STORAGE UNIT
sql> SHOW DEFAULT SINGLE TABLE STORAGE UNIT;
+-------------------+
| storage_unit_name |
+-------------------+
|  ds_0             |
+-------------------+
1 row in set (0.01 sec)
SHOW SINGLE TABLE tableName
sql> SHOW SINGLE TABLE t_single_0;
+----------------+-------------------+
| table_name     | storage_unit_name |
+----------------+-------------------+
| t_single_0     | ds_0              |
+----------------+-------------------+
1 row in set (0.01 sec)
SHOW SINGLE TABLES
mysql> SHOW SINGLE TABLES;
+--------------+-------------------+
| table_name   | storage_unit_name |
+--------------+-------------------+
| t_single_0   | ds_0              |
| t_single_1   | ds_1              |
+--------------+-------------------+
2 rows in set (0.02 sec)
COUNT SINGLE_TABLE RULE
mysql> COUNT SINGLE_TABLE RULE;
+--------------+----------+-------+
| rule_name    | database | count |
+--------------+----------+-------+
| t_single_0   | ds       | 2     |
+--------------+----------+-------+
1 row in set (0.02 sec)
