src/SQL/ColumnExpression.php
public function count($column = '*', string $alias = null, bool $distinct = false): self
    {
        return $this->column((new Expression())->count($column, $distinct), $alias);
    }
public function count($column = '*', string $alias = null, bool $distinct = false): self
    {
        return $this->column((new Expression())->count($column, $distinct), $alias);
    }
public function count ( $ column = '*' , string $ alias = null , bool $ distinct = false ) : self { return $ this -> column ( ( new Expression ( ) ) -> count ( $ column , $ distinct ) , $ alias ) ; }
Add a `COUNT` expression

@param   string|array|Expression $column Column
@param   string $alias (optional) Column's alias
@param   bool $distinct (optional) Distinct column

@return  $this
Add a COUNT expression