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POOracle SQL - Add Primary Key to table
 

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    <p>I have some columns with no primary key and <strong>want to add a primary key column</strong>.</p> <pre><code>NAME Age ------------- Peter 45 Bob 25 John 56 Peter 45 </code></pre> <p><strong><em>Some collegues suggest to add a PK with a sequences and triggers</em></strong>: <a href="https://stackoverflow.com/questions/11464396/add-a-auto-increment-primary-key-to-existing-table-in-oracle">Add a auto increment primary key to existing table in oracle</a></p> <p>This is nice, but <strong><em>my customers use a Database User with no rights to add sequences or triggers</em></strong>. I want to prevent to contact dozens of DBA administrators to alter user rights or to run my scripts.</p> <p><strong><em>This is my suggestion to add a PK with only an update statement: (I need help in Step 2)</em></strong></p> <p><em>Step 1:</em> Create the ID column (<em>I have DB rights for this</em>)</p> <pre><code>ALTER TABLE PERSON ADD ID NUMBER(10,0); </code></pre> <p><em>Step 2:</em> <strong>Question: Can I initialize the ID column with unique values based on the order of the rows or something else? How?</strong></p> <pre><code>UPDATE PERSON SET ID = something-unique </code></pre> <p><em>Step 3:</em> Add the primary key contraint afterwords: (<em>I DB have rights for this</em>)</p> <pre><code>ALTER TABLE PERSON ADD CONSTRAINT PK_ID PRIMARY KEY(ID); </code></pre> <p><em>Step 4:</em> Afterwords: the primary key is managed and added by my application.</p> <p>This will be the result:</p> <pre><code>ID(PK) NAME Age --------------------- 1 Peter 45 2 Bob 25 3 John 56 4 Peter 45 </code></pre> <p>Thanks folks!</p>
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    1. USDimitri Dewaele
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    1. COWhat's the question?
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      1. USWW.
    2. COWW gives the method for populating the PK based on a sequential number, but in your question you say, "... based on the order of the rows". Do you have a defined order for the rows, such as a "created_at" timestamp?
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      1. USDavid Aldridge
    3. COI have updated my text with a more clear question. Thanks WW!
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      1. USDimitri Dewaele
 

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