diff --git a/src/Common/EntityField.php b/src/Common/EntityField.php
index c0f72c9..a9ce096 100644
--- a/src/Common/EntityField.php
+++ b/src/Common/EntityField.php
@@ -53,8 +53,6 @@ class EntityField
     {
         $definition = new FieldDefinition($field);
 
-        # column_name data_type(length) [NOT NULL] [DEFAULT value] [AUTO_INCREMENT] column_constraint;
-
         return implode(" ", [
             $definition->getSqlName(),
             $definition->getSqlType(),
diff --git a/src/Common/EntityResolver.php b/src/Common/EntityResolver.php
index 3dc23fc..95e90f9 100644
--- a/src/Common/EntityResolver.php
+++ b/src/Common/EntityResolver.php
@@ -83,13 +83,23 @@ class EntityResolver {
                             throw new \InvalidArgumentException("Given `fieldKey` is unknown to the EntityResolver");
                     }
 
+                    if ($escape) {
+                        if ( isset($tag['object']->name) ) {
+                            $tag['object']->name = 2;
+                        }
+
+                        if ( isset($item['name']) ) {
+                            $item['name'] = 2;
+                        }
+                    }
+
                     $fieldList[$key] = $item;
                     
                     break;
                 }
             }
         }
-        
+
         return $fieldList;
     }
 
diff --git a/src/EntityCollection.php b/src/EntityCollection.php
index cb17ff8..2fb8120 100644
--- a/src/EntityCollection.php
+++ b/src/EntityCollection.php
@@ -25,12 +25,12 @@ class EntityCollection extends \ArrayObject {
             }
         }
     }
-        
-    public function filtersCollection(Callable $callback, bool $replaceCollection = false) : self
+
+    public function filtersCollection(Callable $callback, bool $yieldValueOnly = false, bool $replaceCollection = false) : self
     {
         $collection = new static();
-        
-        foreach($this->filters($callback, true) as $item) {
+
+        foreach($this->filters($callback, $yieldValueOnly) as $item) {
             $collection->append($item);
         }
 
@@ -86,15 +86,8 @@ class EntityCollection extends \ArrayObject {
 
         return $removed;
     }
-    
-    public function clear() : self
-    {
-        $this->exchangeArray([]);
-        
-        return $this;
-    }
-    
-    public function search($value, string $field, bool $strict = true) : Generator 
+
+    public function search($value, string $field, bool $strict = true) : Generator
     {
         foreach($this->filters(fn($v) => $strict ? $v->$field === $value : $v->$field == $value) as $key => $item) {
             yield $key => $item;
@@ -121,12 +114,7 @@ class EntityCollection extends \ArrayObject {
 
         return $obj;
     }
-    
-    public function searchInstances(string $className) : self
-    {
-        return $this->filtersCollection(fn($obj) => is_a($obj, $className));
-    }
-    
+
     public function column($field, bool $unique = false) : array
     {
         $list = [];
@@ -138,9 +126,9 @@ class EntityCollection extends \ArrayObject {
             else {
                 $value = $item->$field;
             }
-            
-            if ($unique && in_array($value, $list, true)) {
-                continue;
+
+            if ($unique && in_array($value, $list)) {
+                break;
             }
 
             $list[] = $value;
@@ -269,22 +257,15 @@ class EntityCollection extends \ArrayObject {
             parent::append($value);
         }
     }
-    
-    public function mergeWith(... $datasets) : self
+
+    public function mergeWith( /*array|EntityCollection*/ $datasets ) : self
     {
-        $list = [];
-        
-        foreach($datasets as $dataset) {
-            if ( is_object($dataset) ) {
-                $list = array_merge($dataset->getArrayCopy(), $list);
-            }
-            else {
-                $list = array_merge($dataset, $list);
-            }
+        if ( is_object($datasets) ) {
+            $datasets = $datasets->getArrayCopy();
         }
-        
-        $this->exchangeArray( array_merge( $this->getArrayCopy(), $list ) );
-        
+
+        $this->exchangeArray( array_merge( $this->getArrayCopy(), $datasets ) );
+
         return $this;
     }
 
@@ -329,11 +310,32 @@ class EntityCollection extends \ArrayObject {
         return $this;
     }
 
-    public function rsort(callable $callback, $function = "uasort") : self
+    public function pop() /* : mixed */
     {
-        $this->sort(...func_get_args());
+        $arr = $this->getArrayCopy();
+        $pop = array_pop($arr);
+        $this->exchangeArray($arr);
 
-        return $this->reverse();
+        return $pop;
+    }
+
+    public function shift() /* : mixed */
+    {
+        $arr = $this->getArrayCopy();
+        $shift = array_shift($arr);
+        $this->exchangeArray($arr);
+
+        return $shift;
+    }
+
+    public function reverse() : self
+    {
+        return $this->replaceWith(array_reverse($this->getArrayCopy()));
+    }
+
+    public function slice(int $offset, ? int $length = null) : self
+    {
+        return new self(array_slice($this->getArrayCopy(), $offset, $length));
     }
 
     public function sortField(? string $field = null) : self
@@ -345,14 +347,4 @@ class EntityCollection extends \ArrayObject {
     {
         return $this->sort(fn($e1, $e2) => $field ? $e2->$field <=> $e1->$field : $e2 <=> $e1);
     }
-
-    public function reverse() : self
-    {
-        return $this->replaceWith(array_reverse($this->getArrayCopy()));;
-    }
-
-    public function slice(int $offset, ? int $length = null) : self
-    {
-        return new self(array_slice($this->getArrayCopy(), $offset, $length));
-    }
 }
diff --git a/src/Migration/FieldDefinition.php b/src/Migration/FieldDefinition.php
index d888512..ad35d5d 100644
--- a/src/Migration/FieldDefinition.php
+++ b/src/Migration/FieldDefinition.php
@@ -11,6 +11,8 @@ class FieldDefinition {
 
     public bool $builtIn;
 
+    public string $name;
+
     public string $type;
 
     public array $tags;
@@ -115,9 +117,7 @@ class FieldDefinition {
 
     protected function getFieldTag() : ? Field
     {
-        $field = array_filter($this->tags, function($item) {
-            return $item['object'] instanceof Field;
-        });
+        $field = array_filter($this->tags, fn($item) => $item['object'] instanceof Field);
 
         return array_pop($field)['object'];
     }
diff --git a/src/Query/Create.php b/src/Query/Create.php
index ed7ca4b..b884339 100644
--- a/src/Query/Create.php
+++ b/src/Query/Create.php
@@ -22,14 +22,13 @@ class Create extends Fragment {
     public function render() : string
     {
         return $this->renderSegments([
-            static::SQL_TOKEN, $this->renderTables($this->table),
-            $this->renderFields(),
+            static::SQL_TOKEN, $this->renderTables($this->table), $this->renderFields(),
         ]);
     }
 
     public function renderFields() : string
     {
-        return "(" . PHP_EOL . implode(",".PHP_EOL, array_map(function($field) {
+        return "(" . PHP_EOL . implode("," . PHP_EOL, array_map(function($field) {
             return "    " . EntityField::generateCreateColumn($field);
         }, $this->fieldList)) . PHP_EOL . ")";
     }
diff --git a/src/Query/Set.php b/src/Query/Set.php
index 2004919..a3ddce4 100644
--- a/src/Query/Set.php
+++ b/src/Query/Set.php
@@ -9,7 +9,9 @@ class Set extends Fragment {
     public int $order = 0;
     
     public array $dataset;
-    
+
+    public ? array $escapedFields;
+
     public QueryBuilderInterface $queryBuilder;
 
     public function __construct(QueryBuilderInterface $queryBuilder)
@@ -17,10 +19,11 @@ class Set extends Fragment {
         $this->queryBuilder = $queryBuilder;
     }
     
-    public function set(array $dataset) : self
+    public function set(array $dataset, ? array $escapedFields = null) : self
     {
         $this->dataset = $dataset;
-        
+        $this->escapedFields = $escapedFields;
+
         return $this;
     }
 
@@ -34,10 +37,13 @@ class Set extends Fragment {
     public function renderParameterPlaceholders() : string 
     {        
         $keys = [];
-        
+
         foreach($this->dataset as $key =>$value) {
             $this->queryBuilder->addParameter($value, ":v_$key");
-            $keys[] = "$key=:v_$key";
+
+            $field = $this->escapedFields[$key] ?? $key;
+
+            $keys[] = "{$field}=:v_{$key}";
         }
         
         return implode(",", $keys);
diff --git a/src/QueryBuilder.php b/src/QueryBuilder.php
index 7d30901..6134203 100644
--- a/src/QueryBuilder.php
+++ b/src/QueryBuilder.php
@@ -119,7 +119,7 @@ class QueryBuilder implements Query\QueryBuilderInterface
         return $this;
     }
 
-    public function set(array $dataset) : self 
+    public function set(array $dataset, ? array $escapedFields = null) : self
     {
         
         if ( null === ( $set = $this->getFragment(Query\Set::class) ) ) {
@@ -127,7 +127,7 @@ class QueryBuilder implements Query\QueryBuilderInterface
             $this->push($set);
         }
         
-        $set->set($dataset);
+        $set->set($dataset, $escapedFields);
         
         return $this;
     }
diff --git a/src/Repository.php b/src/Repository.php
index 00ab211..8ce8bc6 100644
--- a/src/Repository.php
+++ b/src/Repository.php
@@ -2,7 +2,7 @@
 
 namespace Ulmus;
 
-use Ulmus\Annotation\Property\{ Where, Having, Relation, Join, WithJoin, Relation\Ignore as RelationIgnore };
+use Ulmus\Annotation\Property\{Field, Where, Having, Relation, Join, WithJoin, Relation\Ignore as RelationIgnore};
 use Ulmus\Common\EntityResolver;
 
 class Repository
@@ -175,64 +175,6 @@ class Repository
         }
     }
 
-    public function loadCollectionRelation(EntityCollection $collection, /*array|string*/ $fields) : void
-    {
-        foreach((array) $fields as $name) {
-            if ( null !== ( $relation = $this->entityResolver->searchFieldAnnotation($name, new Annotation\Property\Relation() ) ) ) {
-                $relationType = strtolower(str_replace(['-', '_', ' '], '', $relation->type));
-
-                $order = $this->entityResolver->searchFieldAnnotationList($name, new Annotation\Property\OrderBy() );
-                $where = $this->entityResolver->searchFieldAnnotationList($name, new Annotation\Property\Where() );
-
-                $baseEntity = $relation->entity ?? $relation->bridge ?? $this->entityResolver->properties[$name]['type'];
-                $baseEntityResolver = $baseEntity::resolveEntity();
-
-                $property = ( $baseEntityResolver->field($relation->foreignKey, 01, false) ?: $baseEntityResolver->field($relation->foreignKey, 02) )['name'];
-                $entityProperty = ( $this->entityResolver->field($relation->key, 01, false) ?: $this->entityResolver->field($relation->key, 02) )['name'];
-
-                $repository = $baseEntity::repository();
-
-                foreach($where as $condition) {
-                    $repository->where($condition->field, is_callable($condition->value) ? call_user_func_array($condition->value, [ $this ]) : $condition->value, $condition->operator, $condition->condition);
-                }
-
-                foreach($order as $item) {
-                    $repository->orderBy($item->field, $item->order);
-                }
-
-                $field = $relation->key;
-
-                $values = [];
-
-                $key = is_object($relation->foreignKey) ? $relation->foreignKey : $baseEntity::field($relation->foreignKey);
-
-                foreach($collection as $item) {
-                    $values[] = is_callable($field) ? $field($item) : $item->$entityProperty;
-                }
-
-                $repository->where($key, $values);
-
-                switch( $relationType ) {
-                    case 'onetoone':
-                        $results = call_user_func([ $repository, "loadOne" ]);
-                        $item->$name = $results ?: new $baseEntity();
-                        
-                        break;
-                        
-                    case 'onetomany':
-                        $results = call_user_func([ $repository, $relation->function ]);
-                        
-                        foreach($collection as $item) {
-                            $item->$name = $baseEntity::entityCollection();
-                            $item->$name->mergeWith( $results->filtersCollection(fn($e) => $e->$property === $item->$entityProperty ) );
-                        }
-                        
-                        break;
-                }
-            }
-        }
-    }
-    
     public function truncate(? string $table = null, ? string $alias = null, ? string $schema = null) : self
     {
         $schema = $schema ?: $this->entityResolver->schemaName();
@@ -347,7 +289,10 @@ class Repository
 
     public function set(array $dataset) : self
     {
-        $this->queryBuilder->set($dataset);
+        $keys = array_keys($dataset);
+        $escapedFields = array_combine($keys, array_map([ $this, 'escapeField' ], $keys));
+
+        $this->queryBuilder->set($dataset, $escapedFields);
 
         return $this;
     }
@@ -732,7 +677,7 @@ class Repository
     public function createSqlQuery() : self
     {
         if ( null === $this->queryBuilder->getFragment(Query\Create::class) ) {
-            $this->queryBuilder->create($this->entityResolver->fieldList(), $this->escapeTable($this->entityResolver->tableName()), $this->entityResolver->schemaName());
+            $this->queryBuilder->create($this->escapeFieldList($this->entityResolver->fieldList()), $this->escapeTable($this->entityResolver->tableName()), $this->entityResolver->schemaName());
         }
 
         if ( null === $this->queryBuilder->getFragment(Query\Engine::class) ) {
@@ -778,6 +723,21 @@ class Repository
         return $this->adapter->adapter()->escapeIdentifier($identifier, Adapter\AdapterInterface::IDENTIFIER_FIELD);
     }
 
+    public function escapeFieldList(array $fieldList) : array
+    {
+        foreach($fieldList as & $list) {
+            $list['name'] = $this->escapeField($list['name']);
+
+            $fieldTag = array_filter($list['tags'] ?? [], fn($item) => $item['object'] instanceof Field)[0]['object'] ?? null;
+
+            if ( $fieldTag && isset($fieldTag->name)  ) {
+                $fieldTag->name = $this->escapeField($fieldTag->name);
+            }
+        }
+
+        return $fieldList;
+    }
+
     public function escapeTable(string $identifier) : string
     {
         return $this->adapter->adapter()->escapeIdentifier($identifier, Adapter\AdapterInterface::IDENTIFIER_TABLE);