title: What's the reason / usefulness is to use ENABLE keyword in oracle database statements
body: <p>I would like to know what's the advantage or usefulness of using ENABLE  keyword, in statements like:</p>
  
  <pre><code>CREATE TABLE "EVALUATION" (
      "EVALUATION_ID" NUMBER(20, 0) NOT NULL ENABLE,
  </code></pre>
  
  <p>OR </p>
  
  <pre><code>ALTER TABLE "EVALUATION"
  ADD CONSTRAINT("EVALUATION_FK")
  FOREIGN KEY ("CREW_ID")
  REFERENCES "CREW" ("CREW_ID") ENABLE;
  </code></pre>
  
  <p>For what I read in the documentation, <code>ENABLE</code> is on by default.</p>
  
  <p>Could I assume it is just to enable something that has been previously disabled?</p>