Retro Eye care Haitian Deep Dark Default

COUNT MASK RULE

Description

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

Syntax

CountMaskRule::=
  'COUNT' 'MASK' 'RULE' ('FROM' databaseName)?

databaseName ::=
  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

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 mask rules for specified database.
COUNT MASK RULE FROM mask_db;
mysql> COUNT MASK RULE FROM mask_db;
+-----------+----------+-------+
| rule_name | database | count |
+-----------+----------+-------+
| mask      | mask_db  | 3     |
+-----------+----------+-------+
1 row in set (0.50 sec)
  • Query the number of mask rules for current database.
COUNT MASK RULE;
mysql> COUNT MASK RULE;
+-----------+----------+-------+
| rule_name | database | count |
+-----------+----------+-------+
| mask      | mask_db  | 3     |
+-----------+----------+-------+
1 row in set (0.50 sec)

Reserved word

COUNT, MASK, RULE, FROM