diff --git a/.wiki/apidoc/classes/Rundiz.NestedSet.NestedSet.html b/.wiki/apidoc/classes/Rundiz.NestedSet.NestedSet.html
index 5d1557f..41dea1b 100644
--- a/.wiki/apidoc/classes/Rundiz.NestedSet.NestedSet.html
+++ b/.wiki/apidoc/classes/Rundiz.NestedSet.NestedSet.html
@@ -144,28 +144,28 @@
                                 <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-393726146"></a>
+                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-363686061"></a>
                                 <a href="../namespaces/default.html" style="margin-left: 30px; padding-left: 0">\</a>
             </div>
-            <div id="namespace-393726146" class="accordion-body collapse in">
+            <div id="namespace-363686061" class="accordion-body collapse in">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1069934776"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-2104605486"></a>
                                 <a href="../namespaces/Rundiz.html" style="margin-left: 30px; padding-left: 0">Rundiz</a>
             </div>
-            <div id="namespace-1069934776" class="accordion-body collapse ">
+            <div id="namespace-2104605486" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1331128947"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-2025005609"></a>
                                 <a href="../namespaces/Rundiz.NestedSet.html" style="margin-left: 30px; padding-left: 0">NestedSet</a>
             </div>
-            <div id="namespace-1331128947" class="accordion-body collapse ">
+            <div id="namespace-2025005609" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                     
@@ -581,7 +581,7 @@ <h4>Parameters</h4>
                                 <td><p>Where array structure will be like this.<br></p>
 <pre>
 array(
-    'whereString' => '(`parent`.`columnName` = :value1 AND `parent`.`columnName2` = :value2)',
+    'whereString' => '(`columnName` = :value1 AND `columnName2` = :value2)',
     'whereValues' => array(':value1' => 'lookup value 1', ':value2' => 'lookup value2'),
 )</pre></td>
                             </tr>
@@ -628,7 +628,8 @@ <h4>Parameters</h4>
                                                     <tr>
                                 <td>array</td>
                                 <td>$where </td>
-                                <td><p>Where array structure will be like this.<br></p>
+                                <td><p>Where array structure will be like this.<br>
+<code>parent</code> or <code>child</code> is required if there are ambugious error.</p>
 <pre>
 array(
     'whereString' => '(`parent`.`columnName` = :value1 AND `parent`.`columnName2` = :value2)',
@@ -1113,7 +1114,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/files/NestedSet.html b/.wiki/apidoc/files/NestedSet.html
index fe2e1f7..852d02a 100644
--- a/.wiki/apidoc/files/NestedSet.html
+++ b/.wiki/apidoc/files/NestedSet.html
@@ -144,28 +144,28 @@
                                 <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-1858025945"></a>
+                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-634051635"></a>
                                 <a href="../namespaces/default.html" style="margin-left: 30px; padding-left: 0">\</a>
             </div>
-            <div id="namespace-1858025945" class="accordion-body collapse in">
+            <div id="namespace-634051635" class="accordion-body collapse in">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-2075478224"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1901048125"></a>
                                 <a href="../namespaces/Rundiz.html" style="margin-left: 30px; padding-left: 0">Rundiz</a>
             </div>
-            <div id="namespace-2075478224" class="accordion-body collapse ">
+            <div id="namespace-1901048125" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-369776746"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-739544662"></a>
                                 <a href="../namespaces/Rundiz.NestedSet.html" style="margin-left: 30px; padding-left: 0">NestedSet</a>
             </div>
-            <div id="namespace-369776746" class="accordion-body collapse ">
+            <div id="namespace-739544662" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                     
@@ -232,7 +232,7 @@ <h2>Tags</h2>
                                     version
                                 </th>
                                 <td>
-                                                                            1.0.0                                        
+                                                                            1.0.1                                        
                                                                     </td>
                             </tr>
                                                     <tr>
@@ -308,7 +308,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/graphs/class.html b/.wiki/apidoc/graphs/class.html
index f678625..3b5abc2 100644
--- a/.wiki/apidoc/graphs/class.html
+++ b/.wiki/apidoc/graphs/class.html
@@ -161,7 +161,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/index.html b/.wiki/apidoc/index.html
index 7f94cb6..edb69e6 100644
--- a/.wiki/apidoc/index.html
+++ b/.wiki/apidoc/index.html
@@ -96,28 +96,28 @@
                                 <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-1423518701"></a>
+                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-1958877952"></a>
                                 <a href="namespaces/default.html" style="margin-left: 30px; padding-left: 0">\</a>
             </div>
-            <div id="namespace-1423518701" class="accordion-body collapse in">
+            <div id="namespace-1958877952" class="accordion-body collapse in">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-115016084"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-980481489"></a>
                                 <a href="namespaces/Rundiz.html" style="margin-left: 30px; padding-left: 0">Rundiz</a>
             </div>
-            <div id="namespace-115016084" class="accordion-body collapse ">
+            <div id="namespace-980481489" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1590131023"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-144248844"></a>
                                 <a href="namespaces/Rundiz.NestedSet.html" style="margin-left: 30px; padding-left: 0">NestedSet</a>
             </div>
-            <div id="namespace-1590131023" class="accordion-body collapse ">
+            <div id="namespace-144248844" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                     
@@ -219,7 +219,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/namespaces/Rundiz.NestedSet.html b/.wiki/apidoc/namespaces/Rundiz.NestedSet.html
index f3c167f..568c71a 100644
--- a/.wiki/apidoc/namespaces/Rundiz.NestedSet.html
+++ b/.wiki/apidoc/namespaces/Rundiz.NestedSet.html
@@ -96,28 +96,28 @@
                                 <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-1824843807"></a>
+                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-1500462670"></a>
                                 <a href="../namespaces/default.html" style="margin-left: 30px; padding-left: 0">\</a>
             </div>
-            <div id="namespace-1824843807" class="accordion-body collapse in">
+            <div id="namespace-1500462670" class="accordion-body collapse in">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1916511241"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-669059140"></a>
                                 <a href="../namespaces/Rundiz.html" style="margin-left: 30px; padding-left: 0">Rundiz</a>
             </div>
-            <div id="namespace-1916511241" class="accordion-body collapse ">
+            <div id="namespace-669059140" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-62102218"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-485451542"></a>
                                 <a href="../namespaces/Rundiz.NestedSet.html" style="margin-left: 30px; padding-left: 0">NestedSet</a>
             </div>
-            <div id="namespace-62102218" class="accordion-body collapse ">
+            <div id="namespace-485451542" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                     
@@ -224,7 +224,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/namespaces/Rundiz.html b/.wiki/apidoc/namespaces/Rundiz.html
index c3cf4b9..7980b96 100644
--- a/.wiki/apidoc/namespaces/Rundiz.html
+++ b/.wiki/apidoc/namespaces/Rundiz.html
@@ -96,28 +96,28 @@
                                 <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-248450209"></a>
+                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-2041190892"></a>
                                 <a href="../namespaces/default.html" style="margin-left: 30px; padding-left: 0">\</a>
             </div>
-            <div id="namespace-248450209" class="accordion-body collapse in">
+            <div id="namespace-2041190892" class="accordion-body collapse in">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1053443199"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1252307560"></a>
                                 <a href="../namespaces/Rundiz.html" style="margin-left: 30px; padding-left: 0">Rundiz</a>
             </div>
-            <div id="namespace-1053443199" class="accordion-body collapse ">
+            <div id="namespace-1252307560" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-431632075"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-706112459"></a>
                                 <a href="../namespaces/Rundiz.NestedSet.html" style="margin-left: 30px; padding-left: 0">NestedSet</a>
             </div>
-            <div id="namespace-431632075" class="accordion-body collapse ">
+            <div id="namespace-706112459" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                     
@@ -221,7 +221,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/namespaces/default.html b/.wiki/apidoc/namespaces/default.html
index 74772fb..9ad1034 100644
--- a/.wiki/apidoc/namespaces/default.html
+++ b/.wiki/apidoc/namespaces/default.html
@@ -96,28 +96,28 @@
                                 <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-627145266"></a>
+                                    <a class="accordion-toggle " data-toggle="collapse" data-target="#namespace-292348180"></a>
                                 <a href="../namespaces/default.html" style="margin-left: 30px; padding-left: 0">\</a>
             </div>
-            <div id="namespace-627145266" class="accordion-body collapse in">
+            <div id="namespace-292348180" class="accordion-body collapse in">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1042081315"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-1979526132"></a>
                                 <a href="../namespaces/Rundiz.html" style="margin-left: 30px; padding-left: 0">Rundiz</a>
             </div>
-            <div id="namespace-1042081315" class="accordion-body collapse ">
+            <div id="namespace-1979526132" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                                                     <div class="accordion" style="margin-bottom: 0">
         <div class="accordion-group">
             <div class="accordion-heading">
-                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-2763917"></a>
+                                    <a class="accordion-toggle collapsed" data-toggle="collapse" data-target="#namespace-170311126"></a>
                                 <a href="../namespaces/Rundiz.NestedSet.html" style="margin-left: 30px; padding-left: 0">NestedSet</a>
             </div>
-            <div id="namespace-2763917" class="accordion-body collapse ">
+            <div id="namespace-170311126" class="accordion-body collapse ">
                 <div class="accordion-inner">
 
                     
@@ -219,7 +219,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/reports/deprecated.html b/.wiki/apidoc/reports/deprecated.html
index 8a4b4d5..9afd92d 100644
--- a/.wiki/apidoc/reports/deprecated.html
+++ b/.wiki/apidoc/reports/deprecated.html
@@ -151,7 +151,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/reports/errors.html b/.wiki/apidoc/reports/errors.html
index 2d911aa..8a2f28e 100644
--- a/.wiki/apidoc/reports/errors.html
+++ b/.wiki/apidoc/reports/errors.html
@@ -174,7 +174,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/.wiki/apidoc/reports/markers.html b/.wiki/apidoc/reports/markers.html
index f540ddf..c292739 100644
--- a/.wiki/apidoc/reports/markers.html
+++ b/.wiki/apidoc/reports/markers.html
@@ -150,7 +150,7 @@ <h1><i class="icon-pushpin"></i></h1>
                 <section class="span10 offset1">
                     <hr />
                     Documentation is powered by <a href="http://www.phpdoc.org/">phpDocumentor </a> and authored
-                    on September 18th, 2020 at 20:46.
+                    on September 18th, 2020 at 23:46.
                 </section>
             </section>
         </section>
diff --git a/src/NestedSet.php b/src/NestedSet.php
index 01b40c5..19e3acf 100644
--- a/src/NestedSet.php
+++ b/src/NestedSet.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * @package Nested Set
- * @version 1.0.0
+ * @version 1.0.1
  * @author Vee W.
  * @license http://opensource.org/licenses/MIT MIT
  */
@@ -80,7 +80,7 @@ public function __construct(\PDO $PDO)
      * @param array $where Where array structure will be like this.<br>
      * <pre>
      * array(
-     *     'whereString' => '(`parent`.`columnName` = :value1 AND `parent`.`columnName2` = :value2)',
+     *     'whereString' => '(`columnName` = :value1 AND `columnName2` = :value2)',
      *     'whereValues' => array(':value1' => 'lookup value 1', ':value2' => 'lookup value2'),
      * )</pre>
      * @return boolean Return true on success, false for otherwise.
@@ -91,7 +91,6 @@ public function deletePullUpChildren(int $taxonomy_id, array $where = []): bool
         $sql = 'SELECT `' . $this->idColumnName . '`, `' . $this->parentIdColumnName . '` FROM `' . $this->tableName . '`';
         $sql .= ' WHERE `' . $this->idColumnName . '` = :taxonomy_id';
         if (isset($where['whereString']) && is_string($where['whereString'])) {
-            $where['whereString'] = str_replace(['`parent`.', '`child`.'], '', $where['whereString']);
             $sql .= ' AND ' . $where['whereString'];
         }
         $Sth = $this->PDO->prepare($sql);
@@ -118,7 +117,6 @@ public function deletePullUpChildren(int $taxonomy_id, array $where = []): bool
         $sql .= ' SET `' . $this->parentIdColumnName . '` = :parent_id';
         $sql .= ' WHERE `' . $this->parentIdColumnName . '` = :taxonomy_id';
         if (isset($where['whereString']) && is_string($where['whereString'])) {
-            $where['whereString'] = str_replace(['`parent`.', '`child`.'], '', $where['whereString']);
             $sql .= ' AND ' . $where['whereString'];
         }
         $Sth = $this->PDO->prepare($sql);
@@ -138,7 +136,6 @@ public function deletePullUpChildren(int $taxonomy_id, array $where = []): bool
         // delete the selected taxonomy ID
         $sql = 'DELETE FROM `' . $this->tableName . '` WHERE `' . $this->idColumnName . '` = :taxonomy_id';
         if (isset($where['whereString']) && is_string($where['whereString'])) {
-            $where['whereString'] = str_replace(['`parent`.', '`child`.'], '', $where['whereString']);
             $sql .= ' AND ' . $where['whereString'];
         }
         $Sth = $this->PDO->prepare($sql);
@@ -165,6 +162,7 @@ public function deletePullUpChildren(int $taxonomy_id, array $where = []): bool
      * 
      * @param int $taxonomy_id The taxonomy ID to delete.
      * @param array $where Where array structure will be like this.<br>
+     *                      `parent` or `child` is required if there are ambugious error.
      * <pre>
      * array(
      *     'whereString' => '(`parent`.`columnName` = :value1 AND `parent`.`columnName2` = :value2)',