Array of fields to update to an expression in case of a duplicate record. This variable is a nested array in the following format:

An array of fields which should be set to their database-defined defaults. Used on INSERT. Type:

public Merge::fields(array $fields, array $values = array())

public Merge::__construct(Connection $connection, $table, array $options = array())

public Merge::insertFields(array $fields, array $values = array())

public Merge::useDefaults(array $fields) Specifies

public Merge::key($field, $value = NULL) Sets

protected Merge::conditionTable($table) Sets

The table to be used for INSERT and UPDATE. Type: string File

public Merge::expression($field, $expression, array $arguments = NULL)