| Class | NilClass | 
| In: | lib/sequel/extensions/blank.rb lib/sequel/extensions/sql_expr.rb | 
| Parent: | Object | 
Returns a copy of the object wrapped in a Sequel::SQL::BooleanExpression, allowing easy use of Sequel‘s DSL:
~nil.sql_expr # NOT NULL
    # File lib/sequel/extensions/sql_expr.rb, line 63
63:   def sql_expr
64:     Sequel::SQL::BooleanExpression.new(:NOOP, self)
65:   end