diff --git a/src/procrusql/__init__.py b/src/procrusql/__init__.py
index 7f4a724..de1ccee 100644
--- a/src/procrusql/__init__.py
+++ b/src/procrusql/__init__.py
@@ -73,32 +73,46 @@ class HaveData(Node):
         self.result = csr.fetchall()
         log_check.info("Got %d rows", len(self.result))
         if self.result:
+            extra_columns = list(self.extra.keys())
+            for c in extra_columns:
+                if self.result[0][c] != self.extra[c]:
+                    log_action.info("Updating %s: %s <- %s", key_values, c, self.extra[c])
+                    q = sql.SQL(
+                        "update {table} set {column}={placeholder} where {key_check}"
+                    ).format(
+                        table=sql.Identifier(self.table),
+                        column=sql.Identifier(c),
+                        placeholder=sql.Placeholder(),
+                        key_check=key_check,
+                    )
+                    csr.execute(q, [self.extra[c]] + key_values)
+                    self.result[0][c] = self.extra[c]
             self.set_order()
             self.ok = True
             log_state.info("%s is now ok", self.name)
             return
-
-        extra_values = [v.resolve() if isinstance(v, Ref) else v for v in self.extra.values()]
-        columns = list(self.key.keys()) + list(self.extra.keys())
-        values = key_values + extra_values
-        q = sql.SQL(
-                "insert into {table}({columns}) values({placeholders}) returning *"
-            ).format(
-                table=sql.Identifier(self.table),
-                columns=sql.SQL(", ").join([sql.Identifier(x) for x in columns]),
-                placeholders=sql.SQL(", ").join([sql.Placeholder() for x in columns]),
-            )
-        log_action.info("Inserting data")
-        csr.execute(q, values)
-        self.result = csr.fetchall()
-        log_action.info("Got %d rows", len(self.result))
-        if self.result:
-            self.set_order()
-            self.ok = True
-            log_state.info("%s is now ok", self.name)
-            return
-        # We shouldn't get here. Either the insert succeeded, or it raised an
-        # exception. Success with 0 rows should not happen.
+        else:
+            extra_values = [v.resolve() if isinstance(v, Ref) else v for v in self.extra.values()]
+            columns = list(self.key.keys()) + list(self.extra.keys())
+            values = key_values + extra_values
+            q = sql.SQL(
+                    "insert into {table}({columns}) values({placeholders}) returning *"
+                ).format(
+                    table=sql.Identifier(self.table),
+                    columns=sql.SQL(", ").join([sql.Identifier(x) for x in columns]),
+                    placeholders=sql.SQL(", ").join([sql.Placeholder() for x in columns]),
+                )
+            log_action.info("Inserting data")
+            csr.execute(q, values)
+            self.result = csr.fetchall()
+            log_action.info("Got %d rows", len(self.result))
+            if self.result:
+                self.set_order()
+                self.ok = True
+                log_state.info("%s is now ok", self.name)
+                return
+            # We shouldn't get here. Either the insert succeeded, or it raised an
+            # exception. Success with 0 rows should not happen.
         raise RuntimeError("Unreachable code reached")
 
 class HaveTable(Node):