diff --git a/querydsl-core/src/main/java/com/mysema/query/Detachable.java b/querydsl-core/src/main/java/com/mysema/query/Detachable.java
new file mode 100644
index 000000000..f14bb0586
--- /dev/null
+++ b/querydsl-core/src/main/java/com/mysema/query/Detachable.java
@@ -0,0 +1,180 @@
+/*
+ * Copyright 2011, Mysema Ltd
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mysema.query;
+
+import com.mysema.query.types.Expression;
+import com.mysema.query.types.Predicate;
+import com.mysema.query.types.expr.BooleanExpression;
+import com.mysema.query.types.expr.ComparableExpression;
+import com.mysema.query.types.expr.DateExpression;
+import com.mysema.query.types.expr.DateTimeExpression;
+import com.mysema.query.types.expr.NumberExpression;
+import com.mysema.query.types.expr.StringExpression;
+import com.mysema.query.types.expr.TimeExpression;
+import com.mysema.query.types.query.BooleanSubQuery;
+import com.mysema.query.types.query.ComparableSubQuery;
+import com.mysema.query.types.query.DateSubQuery;
+import com.mysema.query.types.query.DateTimeSubQuery;
+import com.mysema.query.types.query.ListSubQuery;
+import com.mysema.query.types.query.NumberSubQuery;
+import com.mysema.query.types.query.SimpleSubQuery;
+import com.mysema.query.types.query.StringSubQuery;
+import com.mysema.query.types.query.TimeSubQuery;
+
+/**
+ * Detachable defines methods for the construction of SubQuery instances
+ *
+ * @author tiwe
+ *
+ */
+public interface Detachable {
+
+    /**
+     * Return the count of matched rows as a sub query
+     *
+     * @return
+     */
+    NumberSubQuery<Long> count();
+
+    /**
+     * Create an exists(this) expression
+     *
+     * @return
+     */
+    BooleanExpression exists();
+
+    /**
+     * Create a projection expression for the given projection
+     *
+     * @param args
+     * @return
+     */
+    ListSubQuery<Tuple> list(Expression<?>... args);
+    
+    /**
+     * Create a projection expression for the given projection
+     * Non expression arguments are converted into constant expressions
+     * 
+     * @param args
+     * @return
+     */
+    ListSubQuery<Tuple> list(Object... args);
+
+    /**
+     * Create a projection expression for the given projection
+     *
+     * @param <RT>
+     *            generic type of the List
+     * @param projection
+     * @return a List over the projection
+     */
+    <RT> ListSubQuery<RT> list(Expression<RT> projection);
+    
+
+    /**
+     * Create an not exists(this) expression
+     *
+     * @return
+     */
+    BooleanExpression notExists();
+
+    /**
+     * Create a projection expression for the given projection
+     *
+     * @param args
+     * @return
+     */
+    SimpleSubQuery<Tuple> unique(Expression<?>... args);
+    
+    /**
+     * Create a projection expression for the given projection
+     * Non expression arguments are converted into constant expressions
+     * 
+     * @param args
+     * @return
+     */
+    SimpleSubQuery<Tuple> unique(Object... args);
+
+    /**
+     * Create a subquery expression for the given projection
+     *
+     * @param <RT>
+     *            return type
+     * @param projection
+     * @return the result or null for an empty result
+     */
+    <RT> SimpleSubQuery<RT> unique(Expression<RT> projection);
+
+    /**
+     * Create a subquery expression for the given projection
+     *
+     * @param projection
+     * @return
+     */
+    BooleanSubQuery unique(Predicate projection);
+
+    /**
+     * Create a subquery expression for the given projection
+     *
+     * @param projection
+     * @return
+     */
+    StringSubQuery unique(StringExpression projection);
+
+    /**
+     * Create a subquery expression for the given projection
+     *
+     * @param <RT>
+     * @param projection
+     * @return
+     */
+    <RT extends Comparable<?>> ComparableSubQuery<RT> unique(ComparableExpression<RT> projection);
+
+    /**
+     * Create a subquery expression for the given projection
+     *
+     * @param <RT>
+     * @param projection
+     * @return
+     */
+    <RT extends Comparable<?>> DateSubQuery<RT> unique(DateExpression<RT> projection);
+
+    /**
+     * Create a subquery expression for the given projection
+     *
+     * @param <RT>
+     * @param projection
+     * @return
+     */
+    <RT extends Comparable<?>> DateTimeSubQuery<RT> unique(DateTimeExpression<RT> projection);
+
+    /**
+     * Create a subquery expression for the given projection
+     *
+     * @param <RT>
+     * @param projection
+     * @return
+     */
+    <RT extends Comparable<?>> TimeSubQuery<RT> unique(TimeExpression<RT> projection);
+
+    /**
+     * Create a subquery expression for the given projection
+     *
+     * @param <RT>
+     * @param projection
+     * @return
+     */
+    <RT extends Number & Comparable<?>> NumberSubQuery<RT> unique(NumberExpression<RT> projection);
+
+}
diff --git a/querydsl-core/src/main/java/com/mysema/query/QueryFactory.java b/querydsl-core/src/main/java/com/mysema/query/QueryFactory.java
index a1e3bffff..7c03e54ca 100644
--- a/querydsl-core/src/main/java/com/mysema/query/QueryFactory.java
+++ b/querydsl-core/src/main/java/com/mysema/query/QueryFactory.java
@@ -13,7 +13,6 @@
  */
 package com.mysema.query;
 
-import com.mysema.query.types.query.Detachable;
 
 /**
  * Common interface for QueryFactory implementations
diff --git a/querydsl-core/src/main/java/com/mysema/query/support/DetachableAdapter.java b/querydsl-core/src/main/java/com/mysema/query/support/DetachableAdapter.java
index 4371efbad..c5d200649 100644
--- a/querydsl-core/src/main/java/com/mysema/query/support/DetachableAdapter.java
+++ b/querydsl-core/src/main/java/com/mysema/query/support/DetachableAdapter.java
@@ -15,6 +15,7 @@ package com.mysema.query.support;
 
 import javax.annotation.Nullable;
 
+import com.mysema.query.Detachable;
 import com.mysema.query.Tuple;
 import com.mysema.query.types.Expression;
 import com.mysema.query.types.Predicate;
@@ -29,7 +30,6 @@ import com.mysema.query.types.query.BooleanSubQuery;
 import com.mysema.query.types.query.ComparableSubQuery;
 import com.mysema.query.types.query.DateSubQuery;
 import com.mysema.query.types.query.DateTimeSubQuery;
-import com.mysema.query.types.query.Detachable;
 import com.mysema.query.types.query.ListSubQuery;
 import com.mysema.query.types.query.NumberSubQuery;
 import com.mysema.query.types.query.SimpleSubQuery;
diff --git a/querydsl-core/src/main/java/com/mysema/query/support/DetachableMixin.java b/querydsl-core/src/main/java/com/mysema/query/support/DetachableMixin.java
index 701e5ce1c..38b1b4662 100644
--- a/querydsl-core/src/main/java/com/mysema/query/support/DetachableMixin.java
+++ b/querydsl-core/src/main/java/com/mysema/query/support/DetachableMixin.java
@@ -15,6 +15,7 @@ package com.mysema.query.support;
 
 import javax.annotation.Nullable;
 
+import com.mysema.query.Detachable;
 import com.mysema.query.QueryMetadata;
 import com.mysema.query.Tuple;
 import com.mysema.query.types.ConstantImpl;
@@ -34,7 +35,6 @@ import com.mysema.query.types.query.BooleanSubQuery;
 import com.mysema.query.types.query.ComparableSubQuery;
 import com.mysema.query.types.query.DateSubQuery;
 import com.mysema.query.types.query.DateTimeSubQuery;
-import com.mysema.query.types.query.Detachable;
 import com.mysema.query.types.query.ListSubQuery;
 import com.mysema.query.types.query.NumberSubQuery;
 import com.mysema.query.types.query.SimpleSubQuery;
diff --git a/querydsl-core/src/main/java/com/mysema/query/support/DetachableQuery.java b/querydsl-core/src/main/java/com/mysema/query/support/DetachableQuery.java
index bfa78fea8..834cd60b1 100644
--- a/querydsl-core/src/main/java/com/mysema/query/support/DetachableQuery.java
+++ b/querydsl-core/src/main/java/com/mysema/query/support/DetachableQuery.java
@@ -13,6 +13,7 @@
  */
 package com.mysema.query.support;
 
+import com.mysema.query.Detachable;
 import com.mysema.query.Tuple;
 import com.mysema.query.types.Expression;
 import com.mysema.query.types.Predicate;
@@ -27,7 +28,6 @@ import com.mysema.query.types.query.BooleanSubQuery;
 import com.mysema.query.types.query.ComparableSubQuery;
 import com.mysema.query.types.query.DateSubQuery;
 import com.mysema.query.types.query.DateTimeSubQuery;
-import com.mysema.query.types.query.Detachable;
 import com.mysema.query.types.query.ListSubQuery;
 import com.mysema.query.types.query.NumberSubQuery;
 import com.mysema.query.types.query.SimpleSubQuery;
diff --git a/querydsl-core/src/main/java/com/mysema/query/types/SubQueryExpression.java b/querydsl-core/src/main/java/com/mysema/query/types/SubQueryExpression.java
index ba7382bfd..e21a79648 100644
--- a/querydsl-core/src/main/java/com/mysema/query/types/SubQueryExpression.java
+++ b/querydsl-core/src/main/java/com/mysema/query/types/SubQueryExpression.java
@@ -13,8 +13,8 @@
  */
 package com.mysema.query.types;
 
+import com.mysema.query.Detachable;
 import com.mysema.query.QueryMetadata;
-import com.mysema.query.types.query.Detachable;
 
 /**
  *
diff --git a/querydsl-core/src/test/java/com/mysema/query/support/DetachableAdapterTest.java b/querydsl-core/src/test/java/com/mysema/query/support/DetachableAdapterTest.java
index a87dcff7c..b54254a17 100644
--- a/querydsl-core/src/test/java/com/mysema/query/support/DetachableAdapterTest.java
+++ b/querydsl-core/src/test/java/com/mysema/query/support/DetachableAdapterTest.java
@@ -19,9 +19,9 @@ import static org.junit.Assert.assertNotNull;
 import org.junit.Before;
 import org.junit.Test;
 
+import com.mysema.query.Detachable;
 import com.mysema.query.alias.Alias;
 import com.mysema.query.types.EntityPath;
-import com.mysema.query.types.query.Detachable;
 
 
 @SuppressWarnings("unchecked")
diff --git a/querydsl-jpa/src/main/java/com/mysema/query/jpa/JPQLSubQuery.java b/querydsl-jpa/src/main/java/com/mysema/query/jpa/JPQLSubQuery.java
index e4ee2af52..a3032829a 100644
--- a/querydsl-jpa/src/main/java/com/mysema/query/jpa/JPQLSubQuery.java
+++ b/querydsl-jpa/src/main/java/com/mysema/query/jpa/JPQLSubQuery.java
@@ -13,7 +13,7 @@
  */
 package com.mysema.query.jpa;
 
-import com.mysema.query.types.query.Detachable;
+import com.mysema.query.Detachable;
 
 /**
  * @author tiwe