The COUNT SHARDING RULE syntax is used to query the number of sharding rules for specified database.
CountShardingRule::=
'COUNT' 'SHARDING' 'RULE' ('FROM' databaseName)?
databaseName ::=
identifier
databaseName is not specified, the default is the currently used DATABASE. If DATABASE is not used, No database selected will be prompted.| Column | Description |
|---|---|
| rule_name | rule type |
| database | the database to which the rule belongs |
| count | the number of the rule |
COUNT SHARDING RULE FROM test1;
mysql> COUNT SHARDING RULE FROM test1;
+--------------------------+----------+-------+
| rule_name | database | count |
+--------------------------+----------+-------+
| sharding_table | test1 | 2 |
| sharding_table_reference | test1 | 2 |
| broadcast_table | test1 | 0 |
+--------------------------+----------+-------+
3 rows in set (0.00 sec)
COUNT SHARDING RULE;
mysql> COUNT SHARDING RULE;
+--------------------------+----------+-------+
| rule_name | database | count |
+--------------------------+----------+-------+
| sharding_table | test1 | 2 |
| sharding_table_reference | test1 | 2 |
| broadcast_table | test1 | 0 |
+--------------------------+----------+-------+
3 rows in set (0.00 sec)
COUNT, SHARDING, RULE, FROM