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+
+
+noupdate
+~~~~~~~~
+
+ - trigger to prevent updates on single columns.
+
+
+Example:
+~~~~~~~
+
+CREATE TABLE TEST ( COL1 INT, COL2 INT, COL3 INT );
+
+CREATE TRIGGER BT BEFORE UPDATE ON TEST FOR EACH ROW
+	EXECUTE PROCEDURE 
+	noup ('COL1');
+
+-- Now Try
+INSERT INTO TEST VALUES (10,20,30);
+UPDATE TEST SET COL1 = 5;