diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index c5c79a2..c0a2f27 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -7,6 +7,7 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="e784d762-cc2b-4491-8b68-172b29548e2e" name="Default" comment="">
+      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/out/artifacts/deduplicator_jar/deduplicator.jar" afterPath="$PROJECT_DIR$/out/artifacts/deduplicator_jar/deduplicator.jar" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/src/com/nilsgg/deduplicator/PostSQL.java" afterPath="$PROJECT_DIR$/src/com/nilsgg/deduplicator/PostSQL.java" />
     </list>
@@ -81,11 +82,11 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="HashSumFile.java" pinned="false" current-in-tab="true">
+      <file leaf-file-name="HashSumFile.java" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/com/nilsgg/deduplicator/HashSumFile.java">
           <provider selected="true" editor-type-id="text-editor">
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-              <caret line="40" column="18" lean-forward="false" selection-start-line="40" selection-start-column="18" selection-end-line="40" selection-end-column="18" />
+            <state relative-caret-position="187">
+              <caret line="31" column="25" lean-forward="true" selection-start-line="31" selection-start-column="25" selection-end-line="31" selection-end-column="25" />
               <folding>
                 <element signature="e#955#956#0" expanded="true" />
                 <element signature="e#986#987#0" expanded="true" />
@@ -94,19 +95,19 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="PostSQL.java" pinned="false" current-in-tab="false">
+      <file leaf-file-name="PostSQL.java" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/src/com/nilsgg/deduplicator/PostSQL.java">
           <provider selected="true" editor-type-id="text-editor">
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-              <caret line="98" column="0" lean-forward="false" selection-start-line="98" selection-start-column="0" selection-end-line="98" selection-end-column="0" />
+            <state relative-caret-position="272">
+              <caret line="30" column="27" lean-forward="false" selection-start-line="30" selection-start-column="27" selection-end-line="30" selection-end-column="27" />
               <folding>
-                <marker date="1497876207728" expanded="true" signature="1172:1310" ph="CREATE TABLE... Files" />
-                <marker date="1497876207728" expanded="true" signature="1538:1554" ph="DROP TABLE F... " />
-                <marker date="1497876207728" expanded="true" signature="1716:1776" ph="SELECT * FRO... files" />
-                <marker date="1497876207728" expanded="true" signature="2360:2412" ph="UPDATE files... " />
-                <marker date="1497876207728" expanded="true" signature="2790:2863" ph="SELECT EXIST... " />
-                <marker date="1497876207728" expanded="true" signature="2804:2862" ph="SELECT * FRO... pg_tables" />
-                <marker date="1497876207728" expanded="true" signature="3396:3442" ph="INSERT INTO Files... " />
+                <marker date="1497876875153" expanded="true" signature="1173:1311" ph="CREATE TABLE... Files" />
+                <marker date="1497876875153" expanded="true" signature="1539:1555" ph="DROP TABLE F... " />
+                <marker date="1497876875153" expanded="true" signature="1717:1777" ph="SELECT * FRO... files" />
+                <marker date="1497876875153" expanded="true" signature="2361:2413" ph="UPDATE files... " />
+                <marker date="1497876875153" expanded="true" signature="2791:2864" ph="SELECT EXIST... " />
+                <marker date="1497876875153" expanded="true" signature="2805:2863" ph="SELECT * FRO... pg_tables" />
+                <marker date="1497876875153" expanded="true" signature="3397:3443" ph="INSERT INTO Files... " />
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             </state>
           </provider>
@@ -731,7 +732,7 @@
       <workItem from="1497630639373" duration="11880000" />
       <workItem from="1497818390449" duration="3894000" />
       <workItem from="1497852364767" duration="173000" />
-      <workItem from="1497852734939" duration="13205000" />
+      <workItem from="1497852734939" duration="14388000" />
     </task>
     <task id="LOCAL-00001" summary="working version">
       <created>1497631430767</created>
@@ -845,15 +846,21 @@
       <option name="project" value="LOCAL" />
       <updated>1497874992133</updated>
     </task>
-    <option name="localTasksCounter" value="17" />
+    <task id="LOCAL-00017" summary="add method: does table in db exist?">
+      <created>1497876222440</created>
+      <option name="number" value="00017" />
+      <option name="presentableId" value="LOCAL-00017" />
+      <option name="project" value="LOCAL" />
+      <updated>1497876222441</updated>
+    </task>
+    <option name="localTasksCounter" value="18" />
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="55720000" />
+    <option name="totallyTimeSpent" value="56903000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="-8" y="-8" width="1936" height="1056" extended-state="6" />
-    <editor active="true" />
     <layout>
       <window_info id="PlantUML" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
       <window_info id="Palette" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
@@ -875,7 +882,7 @@
       <window_info id="Image Layers" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
       <window_info id="Capture Analysis" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
       <window_info id="Version Control" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
-      <window_info id="Run" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.33586133" sideWeight="0.4445629" order="2" side_tool="false" content_ui="tabs" />
+      <window_info id="Run" active="true" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.33586133" sideWeight="0.4445629" order="2" side_tool="false" content_ui="tabs" />
       <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.7755102" sideWeight="0.48630136" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.26066098" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
       <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.3296582" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
@@ -980,13 +987,13 @@
         <state relative-caret-position="320">
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-            <marker date="1497876207728" expanded="true" signature="1538:1554" ph="DROP TABLE F... " />
-            <marker date="1497876207728" expanded="true" signature="1716:1776" ph="SELECT * FRO... files" />
-            <marker date="1497876207728" expanded="true" signature="2360:2412" ph="UPDATE files... " />
-            <marker date="1497876207728" expanded="true" signature="2790:2863" ph="SELECT EXIST... " />
-            <marker date="1497876207728" expanded="true" signature="2804:2862" ph="SELECT * FRO... pg_tables" />
-            <marker date="1497876207728" expanded="true" signature="3396:3442" ph="INSERT INTO Files... " />
+            <marker date="1497876875153" expanded="true" signature="1173:1311" ph="CREATE TABLE... Files" />
+            <marker date="1497876875153" expanded="true" signature="1539:1555" ph="DROP TABLE F... " />
+            <marker date="1497876875153" expanded="true" signature="1717:1777" ph="SELECT * FRO... files" />
+            <marker date="1497876875153" expanded="true" signature="2361:2413" ph="UPDATE files... " />
+            <marker date="1497876875153" expanded="true" signature="2791:2864" ph="SELECT EXIST... " />
+            <marker date="1497876875153" expanded="true" signature="2805:2863" ph="SELECT * FRO... pg_tables" />
+            <marker date="1497876875153" expanded="true" signature="3397:3443" ph="INSERT INTO Files... " />
           </folding>
         </state>
       </provider>
@@ -1065,13 +1072,13 @@
         <state relative-caret-position="240">
           <caret line="14" column="51" lean-forward="true" selection-start-line="14" selection-start-column="51" selection-end-line="14" selection-end-column="51" />
           <folding>
-            <marker date="1497876207728" expanded="true" signature="1172:1310" ph="CREATE TABLE... Files" />
-            <marker date="1497876207728" expanded="true" signature="1538:1554" ph="DROP TABLE F... " />
-            <marker date="1497876207728" expanded="true" signature="1716:1776" ph="SELECT * FRO... files" />
-            <marker date="1497876207728" expanded="true" signature="2360:2412" ph="UPDATE files... " />
-            <marker date="1497876207728" expanded="true" signature="2790:2863" ph="SELECT EXIST... " />
-            <marker date="1497876207728" expanded="true" signature="2804:2862" ph="SELECT * FRO... pg_tables" />
-            <marker date="1497876207728" expanded="true" signature="3396:3442" ph="INSERT INTO Files... " />
+            <marker date="1497876875153" expanded="true" signature="1173:1311" ph="CREATE TABLE... Files" />
+            <marker date="1497876875153" expanded="true" signature="1539:1555" ph="DROP TABLE F... " />
+            <marker date="1497876875153" expanded="true" signature="1717:1777" ph="SELECT * FRO... files" />
+            <marker date="1497876875153" expanded="true" signature="2361:2413" ph="UPDATE files... " />
+            <marker date="1497876875153" expanded="true" signature="2791:2864" ph="SELECT EXIST... " />
+            <marker date="1497876875153" expanded="true" signature="2805:2863" ph="SELECT * FRO... pg_tables" />
+            <marker date="1497876875153" expanded="true" signature="3397:3443" ph="INSERT INTO Files... " />
           </folding>
         </state>
       </provider>
@@ -1114,13 +1121,13 @@
         <state relative-caret-position="640">
           <caret line="34" column="89" lean-forward="false" selection-start-line="34" selection-start-column="89" selection-end-line="34" selection-end-column="89" />
           <folding>
-            <marker date="1497876207728" expanded="true" signature="1172:1310" ph="CREATE TABLE... Files" />
-            <marker date="1497876207728" expanded="true" signature="1538:1554" ph="DROP TABLE F... " />
-            <marker date="1497876207728" expanded="true" signature="1716:1776" ph="SELECT * FRO... files" />
-            <marker date="1497876207728" expanded="true" signature="2360:2412" ph="UPDATE files... " />
-            <marker date="1497876207728" expanded="true" signature="2790:2863" ph="SELECT EXIST... " />
-            <marker date="1497876207728" expanded="true" signature="2804:2862" ph="SELECT * FRO... pg_tables" />
-            <marker date="1497876207728" expanded="true" signature="3396:3442" ph="INSERT INTO Files... " />
+            <marker date="1497876875153" expanded="true" signature="1173:1311" ph="CREATE TABLE... Files" />
+            <marker date="1497876875153" expanded="true" signature="1539:1555" ph="DROP TABLE F... " />
+            <marker date="1497876875153" expanded="true" signature="1717:1777" ph="SELECT * FRO... files" />
+            <marker date="1497876875153" expanded="true" signature="2361:2413" ph="UPDATE files... " />
+            <marker date="1497876875153" expanded="true" signature="2791:2864" ph="SELECT EXIST... " />
+            <marker date="1497876875153" expanded="true" signature="2805:2863" ph="SELECT * FRO... pg_tables" />
+            <marker date="1497876875153" expanded="true" signature="3397:3443" ph="INSERT INTO Files... " />
           </folding>
         </state>
       </provider>
@@ -1163,13 +1170,13 @@
         <state relative-caret-position="340">
           <caret line="19" column="35" lean-forward="false" selection-start-line="19" selection-start-column="35" selection-end-line="19" selection-end-column="35" />
           <folding>
-            <marker date="1497876207728" expanded="true" signature="1172:1310" ph="CREATE TABLE... Files" />
-            <marker date="1497876207728" expanded="true" signature="1538:1554" ph="DROP TABLE F... " />
-            <marker date="1497876207728" expanded="true" signature="1716:1776" ph="SELECT * FRO... files" />
-            <marker date="1497876207728" expanded="true" signature="2360:2412" ph="UPDATE files... " />
-            <marker date="1497876207728" expanded="true" signature="2790:2863" ph="SELECT EXIST... " />
-            <marker date="1497876207728" expanded="true" signature="2804:2862" ph="SELECT * FRO... pg_tables" />
-            <marker date="1497876207728" expanded="true" signature="3396:3442" ph="INSERT INTO Files... " />
+            <marker date="1497876875153" expanded="true" signature="1173:1311" ph="CREATE TABLE... Files" />
+            <marker date="1497876875153" expanded="true" signature="1539:1555" ph="DROP TABLE F... " />
+            <marker date="1497876875153" expanded="true" signature="1717:1777" ph="SELECT * FRO... files" />
+            <marker date="1497876875153" expanded="true" signature="2361:2413" ph="UPDATE files... " />
+            <marker date="1497876875153" expanded="true" signature="2791:2864" ph="SELECT EXIST... " />
+            <marker date="1497876875153" expanded="true" signature="2805:2863" ph="SELECT * FRO... pg_tables" />
+            <marker date="1497876875153" expanded="true" signature="3397:3443" ph="INSERT INTO Files... " />
           </folding>
         </state>
       </provider>
@@ -1212,13 +1219,13 @@
         <state relative-caret-position="340">
           <caret line="19" column="35" lean-forward="false" selection-start-line="19" selection-start-column="35" selection-end-line="19" selection-end-column="35" />
           <folding>
-            <marker date="1497876207728" expanded="true" signature="1172:1310" ph="CREATE TABLE... Files" />
-            <marker date="1497876207728" expanded="true" signature="1538:1554" ph="DROP TABLE F... " />
-            <marker date="1497876207728" expanded="true" signature="1716:1776" ph="SELECT * FRO... files" />
-            <marker date="1497876207728" expanded="true" signature="2360:2412" ph="UPDATE files... " />
-            <marker date="1497876207728" expanded="true" signature="2790:2863" ph="SELECT EXIST... " />
-            <marker date="1497876207728" expanded="true" signature="2804:2862" ph="SELECT * FRO... pg_tables" />
-            <marker date="1497876207728" expanded="true" signature="3396:3442" ph="INSERT INTO Files... " />
+            <marker date="1497876875153" expanded="true" signature="1173:1311" ph="CREATE TABLE... Files" />
+            <marker date="1497876875153" expanded="true" signature="1539:1555" ph="DROP TABLE F... " />
+            <marker date="1497876875153" expanded="true" signature="1717:1777" ph="SELECT * FRO... files" />
+            <marker date="1497876875153" expanded="true" signature="2361:2413" ph="UPDATE files... " />
+            <marker date="1497876875153" expanded="true" signature="2791:2864" ph="SELECT EXIST... " />
+            <marker date="1497876875153" expanded="true" signature="2805:2863" ph="SELECT * FRO... pg_tables" />
+            <marker date="1497876875153" expanded="true" signature="3397:3443" ph="INSERT INTO Files... " />
           </folding>
         </state>
       </provider>
@@ -1261,13 +1268,13 @@
         <state relative-caret-position="306">
           <caret line="20" column="31" lean-forward="false" selection-start-line="20" selection-start-column="31" selection-end-line="20" selection-end-column="31" />
           <folding>
-            <marker date="1497876207728" expanded="true" signature="1172:1310" ph="CREATE TABLE... Files" />
-            <marker date="1497876207728" expanded="true" signature="1538:1554" ph="DROP TABLE F... " />
-            <marker date="1497876207728" expanded="true" signature="1716:1776" ph="SELECT * FRO... files" />
-            <marker date="1497876207728" expanded="true" signature="2360:2412" ph="UPDATE files... " />
-            <marker date="1497876207728" expanded="true" signature="2790:2863" ph="SELECT EXIST... " />
-            <marker date="1497876207728" expanded="true" signature="2804:2862" ph="SELECT * FRO... pg_tables" />
-            <marker date="1497876207728" expanded="true" signature="3396:3442" ph="INSERT INTO Files... " />
+            <marker date="1497876875153" expanded="true" signature="1173:1311" ph="CREATE TABLE... Files" />
+            <marker date="1497876875153" expanded="true" signature="1539:1555" ph="DROP TABLE F... " />
+            <marker date="1497876875153" expanded="true" signature="1717:1777" ph="SELECT * FRO... files" />
+            <marker date="1497876875153" expanded="true" signature="2361:2413" ph="UPDATE files... " />
+            <marker date="1497876875153" expanded="true" signature="2791:2864" ph="SELECT EXIST... " />
+            <marker date="1497876875153" expanded="true" signature="2805:2863" ph="SELECT * FRO... pg_tables" />
+            <marker date="1497876875153" expanded="true" signature="3397:3443" ph="INSERT INTO Files... " />
           </folding>
         </state>
       </provider>
@@ -1399,29 +1406,29 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/com/nilsgg/deduplicator/PostSQL.java">
+    <entry file="file://$PROJECT_DIR$/src/com/nilsgg/deduplicator/HashSumFile.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="391">
-          <caret line="98" column="0" lean-forward="false" selection-start-line="98" selection-start-column="0" selection-end-line="98" selection-end-column="0" />
+        <state relative-caret-position="187">
+          <caret line="31" column="25" lean-forward="true" selection-start-line="31" selection-start-column="25" selection-end-line="31" selection-end-column="25" />
           <folding>
-            <marker date="1497876207728" expanded="true" signature="1172:1310" ph="CREATE TABLE... Files" />
-            <marker date="1497876207728" expanded="true" signature="1538:1554" ph="DROP TABLE F... " />
-            <marker date="1497876207728" expanded="true" signature="1716:1776" ph="SELECT * FRO... files" />
-            <marker date="1497876207728" expanded="true" signature="2360:2412" ph="UPDATE files... " />
-            <marker date="1497876207728" expanded="true" signature="2790:2863" ph="SELECT EXIST... " />
-            <marker date="1497876207728" expanded="true" signature="2804:2862" ph="SELECT * FRO... pg_tables" />
-            <marker date="1497876207728" expanded="true" signature="3396:3442" ph="INSERT INTO Files... " />
+            <element signature="e#955#956#0" expanded="true" />
+            <element signature="e#986#987#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/com/nilsgg/deduplicator/HashSumFile.java">
+    <entry file="file://$PROJECT_DIR$/src/com/nilsgg/deduplicator/PostSQL.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="306">
-          <caret line="40" column="18" lean-forward="false" selection-start-line="40" selection-start-column="18" selection-end-line="40" selection-end-column="18" />
+        <state relative-caret-position="272">
+          <caret line="30" column="27" lean-forward="false" selection-start-line="30" selection-start-column="27" selection-end-line="30" selection-end-column="27" />
           <folding>
-            <element signature="e#955#956#0" expanded="true" />
-            <element signature="e#986#987#0" expanded="true" />
+            <marker date="1497876875153" expanded="true" signature="1173:1311" ph="CREATE TABLE... Files" />
+            <marker date="1497876875153" expanded="true" signature="1539:1555" ph="DROP TABLE F... " />
+            <marker date="1497876875153" expanded="true" signature="1717:1777" ph="SELECT * FRO... files" />
+            <marker date="1497876875153" expanded="true" signature="2361:2413" ph="UPDATE files... " />
+            <marker date="1497876875153" expanded="true" signature="2791:2864" ph="SELECT EXIST... " />
+            <marker date="1497876875153" expanded="true" signature="2805:2863" ph="SELECT * FRO... pg_tables" />
+            <marker date="1497876875153" expanded="true" signature="3397:3443" ph="INSERT INTO Files... " />
           </folding>
         </state>
       </provider>
diff --git a/out/artifacts/deduplicator_jar/deduplicator.jar b/out/artifacts/deduplicator_jar/deduplicator.jar
index cf6bd22..1f6fe31 100644
Binary files a/out/artifacts/deduplicator_jar/deduplicator.jar and b/out/artifacts/deduplicator_jar/deduplicator.jar differ
diff --git a/src/com/nilsgg/deduplicator/PostSQL.java b/src/com/nilsgg/deduplicator/PostSQL.java
index dc89b10..782d94d 100644
--- a/src/com/nilsgg/deduplicator/PostSQL.java
+++ b/src/com/nilsgg/deduplicator/PostSQL.java
@@ -28,7 +28,7 @@ class PostSQL {
         props.setProperty("password", dbPassword);
         String DB_URL = "jdbc:postgresql://" + dataBase + "/filedb";
         this.conn = DriverManager.getConnection(DB_URL, props);
-        if (createTable|| isFilesTable())
+        if (createTable|| !isFilesTable())
           createTable();
     }