COUNT SHADOW RULE
Description
The COUNT SHADOW RULE syntax is used to query the number of shadow rules for specified database.
Syntax
CountShadowRule::=
'COUNT' 'SHADOW' 'RULE' ('FROM' databaseName)?
databaseName ::=
identifierSupplement
- When
databaseNameis not specified, the default is the currently usedDATABASE. IfDATABASEis not used,No database selectedwill be prompted.
Return value description
| Column | Description |
|---|---|
| rule_name | rule type |
| database | the database to which the rule belongs |
| count | the number of the rule |
Example
- Query the number of shadow rules for specified database.
COUNT SHADOW RULE FROM shadow_db;mysql> COUNT SHADOW RULE FROM shadow_db;
+-----------+--------------+-------+
| rule_name | database | count |
+-----------+--------------+-------+
| shadow | shadow_db | 1 |
+-----------+--------------+-------+
1 row in set (0.00 sec)- Query the number of shadow rules for current database.
COUNT SHADOW RULE;mysql> COUNT SHADOW RULE;
+-----------+--------------+-------+
| rule_name | database | count |
+-----------+--------------+-------+
| shadow | shadow_db | 1 |
+-----------+--------------+-------+
1 row in set (0.01 sec)Reserved word
COUNT, SHADOW, RULE, FROM