diff -ubr nb-7.0.1-orig/db/src/org/netbeans/api/db/sql/support/SQLIdentifiers.java nb-7.0.1/db/src/org/netbeans/api/db/sql/support/SQLIdentifiers.java
--- nb-7.0.1-orig/db/src/org/netbeans/api/db/sql/support/SQLIdentifiers.java	2011-07-28 20:45:16.000000000 +0200
+++ nb-7.0.1/db/src/org/netbeans/api/db/sql/support/SQLIdentifiers.java	2011-08-15 20:59:22.000000000 +0200
@@ -124,25 +121,16 @@
         public String unquote(String identifier) {
             Parameters.notNull("identifier", identifier);
 
-            int start = 0;
-            while (identifier.regionMatches(start, quoteString, 0, quoteString.length())) {
-                start += quoteString.length();
-            }
-            int end = identifier.length();
-            if (end > start) {
-                for (;;) {
-                    int offset = end - quoteString.length();
-                    if (identifier.regionMatches(offset, quoteString, 0, quoteString.length())) {
-                        end = offset;
-                    } else {
-                        break;
-                    }
-                }
+            String result = identifier;
+
+            if (result.startsWith(quoteString)) {
+                result = result.substring(quoteString.length());
             }
-            String result = "";
-            if (start < end) {
-                result = identifier.substring(start, end);
+
+            if (result.endsWith(quoteString)) {
+                result = result.substring(0, result.lastIndexOf(quoteString));
             }
+
             return result;
         }
 
@@ -151,7 +139,8 @@
         }
 
         boolean alreadyQuoted(String identifier) {
-            return (identifier.startsWith(quoteString) && identifier.endsWith(quoteString));
+            return (identifier.startsWith(quoteString)
+                    && identifier.substring(quoteString.length()).endsWith(quoteString));
         }
 
         String doQuote(String identifier) {
diff -ubr nb-7.0.1-orig/db.sql.editor/src/org/netbeans/modules/db/sql/editor/completion/SQLCompletionQuery.java nb-7.0.1/db.sql.editor/src/org/netbeans/modules/db/sql/editor/completion/SQLCompletionQuery.java
--- nb-7.0.1-orig/db.sql.editor/src/org/netbeans/modules/db/sql/editor/completion/SQLCompletionQuery.java	2011-07-28 20:45:16.000000000 +0200
+++ nb-7.0.1/db.sql.editor/src/org/netbeans/modules/db/sql/editor/completion/SQLCompletionQuery.java	2011-08-15 20:58:56.000000000 +0200
@@ -979,7 +979,7 @@
             if (!incomplete) {
                 lastPrefix = parts.remove(parts.size() - 1);
                 String quoteString = quoter.getQuoteString();
-                if (lastPrefix.startsWith(quoteString)) {
+                if (quoteString.length() > 0 && lastPrefix.startsWith(quoteString)) {
                     if (lastPrefix.endsWith(quoteString) && lastPrefix.length() > quoteString.length()) {
                         // User typed '"foo"."bar"|', can't complete that.
                         return null;
@@ -988,7 +988,7 @@
                     lastPrefix = quoter.unquote(lastPrefix);
                     lastPrefixOffset = lastPrefixOffset + (lastPrefixLength - lastPrefix.length());
                     quoted = true;
-                } else if (lastPrefix.endsWith(quoteString)) {
+                } else if (quoteString.length() > 0 && lastPrefix.endsWith(quoteString)) {
                     // User typed '"foo".bar"|', can't complete.
                     return null;
                 }