diff --git a/lib/rebel/sql.rb b/lib/rebel/sql.rb
index e73f2cb..99fb0c4 100644
--- a/lib/rebel/sql.rb
+++ b/lib/rebel/sql.rb
@@ -66,6 +66,58 @@ module Rebel::SQL
     def on?(clause)
       clause ? on(clause) : self
     end
+
+    def and(clause)
+      Raw.new("#{self} AND #{Rebel::SQL.and_clause(clause)}")
+    end
+
+    def or(clause)
+      Raw.new("#{self} OR #{Rebel::SQL.and_clause(clause)}")
+    end
+
+    def eq(n)
+      case n
+      when nil
+        Raw.new("#{self} IS NULL")
+      else
+        Raw.new("#{self} = #{Rebel::SQL.name_or_value(n)}")
+      end
+    end
+    alias == eq
+
+    def ne(n)
+      case n
+      when nil
+        Raw.new("#{self} IS NOT NULL")
+      else
+        Raw.new("#{self} != #{Rebel::SQL.name_or_value(n)}")
+      end
+    end
+    alias != ne
+
+    def lt(n)
+      Raw.new("#{self} < #{Rebel::SQL.name_or_value(n)}")
+    end
+    alias < lt
+
+    def gt(n)
+      Raw.new("#{self} > #{Rebel::SQL.name_or_value(n)}")
+    end
+    alias > gt
+
+    def le(n)
+      Raw.new("#{self} <= #{Rebel::SQL.name_or_value(n)}")
+    end
+    alias <= le
+
+    def ge(n)
+      Raw.new("#{self} >= #{Rebel::SQL.name_or_value(n)}")
+    end
+    alias >= ge
+
+    def in(*v)
+      Raw.new("#{self} IN (#{Rebel::SQL.values(*v)})")
+    end
   end
 
   class << self
diff --git a/test/test_raw.rb b/test/test_raw.rb
new file mode 100644
index 0000000..4a0e0f2
--- /dev/null
+++ b/test/test_raw.rb
@@ -0,0 +1,55 @@
+require 'minitest/autorun'
+require 'helper'
+require 'rebel'
+
+class TestRaw < Minitest::Test
+  def assert_str_equal(expected, actual)
+    assert_equal(expected.to_s, actual.to_s)
+  end
+
+  def test_and
+    assert_str_equal(Rebel::SQL.name(:foo).eq(1).and(Rebel::SQL.name(:bar).eq(2)), '"foo" = 1 AND "bar" = 2')
+  end
+
+  def test_or
+    assert_str_equal(Rebel::SQL.name(:foo).eq(1).or(Rebel::SQL.name(:bar).eq(2)), '"foo" = 1 OR "bar" = 2')
+  end
+
+  def test_eq
+    assert_str_equal(Rebel::SQL.name(:foo).eq(nil), '"foo" IS NULL')
+    assert_str_equal(Rebel::SQL.name(:foo) == nil,  '"foo" IS NULL')
+    assert_str_equal(Rebel::SQL.name(:foo).eq(Rebel::SQL.name(:bar)), '"foo" = "bar"')
+    assert_str_equal(Rebel::SQL.name(:foo) == Rebel::SQL.name(:bar),  '"foo" = "bar"')
+  end
+
+  def test_ne
+    assert_str_equal(Rebel::SQL.name(:foo).ne(Rebel::SQL.name(:bar)), '"foo" != "bar"')
+    assert_str_equal(Rebel::SQL.name(:foo) != Rebel::SQL.name(:bar), '"foo" != "bar"')
+    assert_str_equal(Rebel::SQL.name(:foo).ne(nil), '"foo" IS NOT NULL')
+    assert_str_equal(Rebel::SQL.name(:foo) != nil, '"foo" IS NOT NULL')
+  end
+
+  def test_lt
+    assert_str_equal(Rebel::SQL.name(:foo).lt(Rebel::SQL.name(:bar)), '"foo" < "bar"')
+    assert_str_equal(Rebel::SQL.name(:foo) <  Rebel::SQL.name(:bar),  '"foo" < "bar"')
+  end
+
+  def test_gt
+    assert_str_equal(Rebel::SQL.name(:foo).gt(Rebel::SQL.name(:bar)), '"foo" > "bar"')
+    assert_str_equal(Rebel::SQL.name(:foo) >  Rebel::SQL.name(:bar),  '"foo" > "bar"')
+  end
+
+  def test_le
+    assert_str_equal(Rebel::SQL.name(:foo).le(Rebel::SQL.name(:bar)), '"foo" <= "bar"')
+    assert_str_equal(Rebel::SQL.name(:foo) <= Rebel::SQL.name(:bar),  '"foo" <= "bar"')
+  end
+
+  def test_ge
+    assert_str_equal(Rebel::SQL.name(:foo).ge(Rebel::SQL.name(:bar)), '"foo" >= "bar"')
+    assert_str_equal(Rebel::SQL.name(:foo) >= Rebel::SQL.name(:bar),  '"foo" >= "bar"')
+  end
+
+  def test_in
+    assert_str_equal(Rebel::SQL.name(:foo).in(1, 2, 3), '"foo" IN (1, 2, 3)')
+  end
+end