diff --git a/src/Orchard.Web/Modules/Orchard.Projections/Services/ProjectionManager.cs b/src/Orchard.Web/Modules/Orchard.Projections/Services/ProjectionManager.cs
index b8dd1f279..4393d0849 100644
--- a/src/Orchard.Web/Modules/Orchard.Projections/Services/ProjectionManager.cs
+++ b/src/Orchard.Web/Modules/Orchard.Projections/Services/ProjectionManager.cs
@@ -120,9 +120,11 @@ namespace Orchard.Projections.Services {
                 tokens.Add("Content", part.ContentItem);
             }
 
-            // aggregate the result for each group query
-            return GetContentQueries(queryRecord, Enumerable.Empty<SortCriterionRecord>(), tokens)
-                .Sum(contentQuery => contentQuery.Count());
+            var contentQueries = GetContentQueries(queryRecord, Enumerable.Empty<SortCriterionRecord>(), tokens);
+
+            return queryRecord.FilterGroups.Count > 1 ?
+                contentQueries.SelectMany(contentQuery => contentQuery.ListIds()).Distinct().Count() :
+                contentQueries.Sum(contentQuery => contentQuery.Count());
         }
 
         public IEnumerable<ContentItem> GetContentItems(int queryId, int skip = 0, int count = 0) {
@@ -189,7 +191,7 @@ namespace Orchard.Projections.Services {
                 groupQuery = sortCriterionContext.Query;
             }
 
-            return groupQuery.Slice(skip, count);
+            return groupQuery.Slice(0, count);
         }
 
         public IEnumerable<IHqlQuery> GetContentQueries(QueryPartRecord queryRecord, IEnumerable<SortCriterionRecord> sortCriteria, Dictionary<string, object> tokens) {
diff --git a/src/Orchard/ContentManagement/DefaultHqlQuery.cs b/src/Orchard/ContentManagement/DefaultHqlQuery.cs
index b22c8e061..92d630b20 100644
--- a/src/Orchard/ContentManagement/DefaultHqlQuery.cs
+++ b/src/Orchard/ContentManagement/DefaultHqlQuery.cs
@@ -184,10 +184,21 @@ namespace Orchard.ContentManagement {
             return Slice(0, 0);
         }
 
-        public IEnumerable<ContentItem> Slice(int skip, int count) {
+        public IEnumerable<int> ListIds() {
+            return ListIds(0, 0);
+        }
+
+        public IEnumerable<ContentItem> Slice(int skip, int count)
+        {
+            var ids = ListIds(skip, count);
+            return ContentManager.GetManyByVersionId(ids, new QueryHints().ExpandRecords(_includedPartRecords));
+        }
+
+        private IEnumerable<int> ListIds(int skip, int count)
+        {
             ApplyHqlVersionOptionsRestrictions(_versionOptions);
             _cacheable = true;
-            
+
             var hql = ToHql(false);
 
             var query = _session
@@ -195,19 +206,19 @@ namespace Orchard.ContentManagement {
                 .SetCacheable(_cacheable)
                 ;
 
-            if (skip != 0) {
+            if (skip != 0)
+            {
                 query.SetFirstResult(skip);
             }
-            if (count != 0 && count != Int32.MaxValue) {
+            if (count != 0 && count != Int32.MaxValue)
+            {
                 query.SetMaxResults(count);
             }
 
-            var ids = query
+            return query
                 .SetResultTransformer(Transformers.AliasToEntityMap)
                 .List<IDictionary>()
                 .Select(x => (int)x["Id"]);
-
-            return ContentManager.GetManyByVersionId(ids, new QueryHints().ExpandRecords(_includedPartRecords));
         }
 
         public int Count() {
diff --git a/src/Orchard/ContentManagement/IHqlQuery.cs b/src/Orchard/ContentManagement/IHqlQuery.cs
index fc8d1279e..4b4250b7b 100644
--- a/src/Orchard/ContentManagement/IHqlQuery.cs
+++ b/src/Orchard/ContentManagement/IHqlQuery.cs
@@ -40,6 +40,11 @@ namespace Orchard.ContentManagement {
         /// </summary>
         IEnumerable<ContentItem> List();
 
+        /// <summary>
+        /// Executes the query and returns all ids for matching content items.
+        /// </summary>
+        IEnumerable<int> ListIds();
+
         /// <summary>
         /// Returns a subset of the matching content items.
         /// </summary>