COUNT SHADOW RULE

Description

The COUNT SHADOW RULE syntax is used to query the number of shadow rules for specified database.

Syntax

Grammar Railroad diagram

  1. CountShadowRule::=
  2.   'COUNT' 'SHADOW' 'RULE' ('FROM' databaseName)?
  4. databaseName ::=
  5.   identifier

Supplement

  • When databaseName is not specified, the default is the currently used DATABASE. If DATABASE is not used, No database selected will be prompted.

Return value description

ColumnDescription
rule_namerule type
databasethe database to which the rule belongs
countthe number of the rule

Example

  • Query the number of shadow rules for specified database.
  1. COUNT SHADOW RULE FROM shadow_db;
  1. mysql> COUNT SHADOW RULE FROM shadow_db;
  2. +-----------+--------------+-------+
  3. | rule_name | database     | count |
  4. +-----------+--------------+-------+
  5. | shadow    | shadow_db    | 1     |
  6. +-----------+--------------+-------+
  7. 1 row in set (0.00 sec)
  • Query the number of shadow rules for current database.
  1. COUNT SHADOW RULE;
  1. mysql> COUNT SHADOW RULE;
  2. +-----------+--------------+-------+
  3. | rule_name | database     | count |
  4. +-----------+--------------+-------+
  5. | shadow    | shadow_db    | 1     |
  6. +-----------+--------------+-------+
  7. 1 row in set (0.01 sec)

Reserved word

COUNT, SHADOW, RULE, FROM