Module Sequel::SQL::NumericMethods
In: lib/sequel/sql.rb

This module includes the standard mathematical methods (+, -, *, and /) that are defined on objects that can be used in a numeric context in SQL (Symbol, LiteralString, and +SQL::GenericExpression+). 

  :a + :b # "a" + "b"
  :a - :b # "a" - "b"
  :a * :b # "a" * "b"
  :a / :b # "a" / "b"

One exception to this is if + is called with a String or StringExpression, in which case the || operator is used instead of the + operator: 

  :a + 'b' # "a" || 'b'

Methods

+  

Public Instance methods

+(ce)

Use || as the operator when called with StringExpression and String instances, and the + operator for LiteralStrings and all other types.

[Source]

     # File lib/sequel/sql.rb, line 416
416:       def +(ce)
417:         case ce
418:         when LiteralString
419:           NumericExpression.new(:+, self, ce)
420:         when StringExpression, String
421:           StringExpression.new('||''||', self, ce)
422:         else
423:           NumericExpression.new(:+, self, ce)
424:         end
425:       end

[Validate]