diff --git a/src/main/java/org/gcube/dataaccess/databases/sampler/Sampler.java b/src/main/java/org/gcube/dataaccess/databases/sampler/Sampler.java
index 07386af..35e642d 100644
--- a/src/main/java/org/gcube/dataaccess/databases/sampler/Sampler.java
+++ b/src/main/java/org/gcube/dataaccess/databases/sampler/Sampler.java
@@ -97,7 +97,7 @@ public class Sampler {
 		if (DBType.equals(POSTGRES)) {
 			
 			//the full name equal to "schemaname.tablename"
-			tableName=schemaName+"."+tableName;
+			tableName=schemaName+"."+"\""+tableName+"\"";
 			
 			querySampleOnTable = String.format(queryForSampleOnTablePostgres,
 					listAttributes, tableName);
@@ -510,7 +510,8 @@ public class Sampler {
 		if (DBType.equals(POSTGRES)) {
 			
 			//the full name equal to "schemaname.tablename"
-			tablename=schemaName+"."+tablename;
+			tablename=schemaName+"."+ "\""+tablename+"\"";
+			
 			
 			query = String.format(queryForSmartSampleOnTablePostgres,
 					listAttributes, tablename);
@@ -903,7 +904,8 @@ public class Sampler {
 			if (DBType.equals(POSTGRES)) {
 
 				//the full name equal to "schemaname.tablename"
-				tablename=schemaName+"."+tablename;
+				tablename=schemaName+"."+ "\""+tablename+"\"";
+				
 				
 				query = String.format(
 						queryForSmartSampleWithThresholdOnTablePostgres,
@@ -1224,7 +1226,7 @@ public class Sampler {
 		if ((NumRows <= 700000) && (DBType.equals(POSTGRES))) { // Postgres
 			
 			//the full name equal to "schemaname.tablename"
-			tableName=schemaName+"."+tableName;
+			tableName=schemaName+"."+ "\""+tableName+"\"";
 
 			querySampleOnTable = String.format(
 					queryForRandomSampleOnTablePostgres, listAttributes,
@@ -1235,7 +1237,8 @@ public class Sampler {
 		if ((NumRows > 700000) && (DBType.equals(POSTGRES))) { // Postgres
 			
 			//the full name equal to "schemaname.tablename"
-			tableName=schemaName+"."+tableName;
+			tableName=schemaName+"."+ "\""+tableName+"\"";
+			
 
 			// generate an index randomly to execute the query
 
diff --git a/src/main/java/org/gcube/dataaccess/databases/utils/DatabaseManagement.java b/src/main/java/org/gcube/dataaccess/databases/utils/DatabaseManagement.java
index 16ef154..4ca07a2 100644
--- a/src/main/java/org/gcube/dataaccess/databases/utils/DatabaseManagement.java
+++ b/src/main/java/org/gcube/dataaccess/databases/utils/DatabaseManagement.java
@@ -960,9 +960,9 @@ public class DatabaseManagement {
 							// RowString);
 
 							// check value row
-							// AnalysisLogger.getLogger().debug(
-							// "writing the value: " + RowString + " key: "
-							// + String.valueOf(i));
+//							 AnalysisLogger.getLogger().debug(
+//							 "writing the value: " + RowString + " key: "
+//							 + String.valueOf(i));
 
 							// mapResult.put(Integer.valueOf(i), RowString);
 							mapResult.put(String.valueOf(i), RowString);