COUNT MASK RULE

Description

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

Syntax

Grammar Railroad diagram

  1. CountMaskRule::=
  2.   'COUNT' 'MASK' '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 mask rules for specified database.
  1. COUNT MASK RULE FROM mask_db;
  1. mysql> COUNT MASK RULE FROM mask_db;
  2. +-----------+----------+-------+
  3. | rule_name | database | count |
  4. +-----------+----------+-------+
  5. | mask      | mask_db  | 3     |
  6. +-----------+----------+-------+
  7. 1 row in set (0.50 sec)
  • Query the number of mask rules for current database.
  1. COUNT MASK RULE;
  1. mysql> COUNT MASK RULE;
  2. +-----------+----------+-------+
  3. | rule_name | database | count |
  4. +-----------+----------+-------+
  5. | mask      | mask_db  | 3     |
  6. +-----------+----------+-------+
  7. 1 row in set (0.50 sec)

Reserved word

COUNT, MASK, RULE, FROM