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POIgnore WHERE condition if record not found
 

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    <p>I have written the following script: </p> <pre><code>SELECT vil.account_id , vil.imp_id, vil.owner , vil.start_date, CASE WHEN ac.status = 4 THEN status_date ELSE NULL END AS Live_date, cs.country_code FROM ACCOUNT ac INNER JOIN vu_imp_list vil ON vil.account_id = ac.account_id INNER JOIN entity e ON ac.entity_id = e.entity_id INNER JOIN country_specifics cs ON e.country_id = cs.country_id WHERE ac.account_id IN ('000206789', '000207464', '000207696', '000207746') AND (vil.start_date = (SELECT MIN(vils.start_date) FROM vu_imp_list vils WHERE vil.account_id = vils.account_id) </code></pre> <p>This will return the oldest <code>imp_id</code> for each <code>account_id</code>. However, it will ignore those which do not have <code>imp_id</code>. As some <code>account_ids</code> do not have <code>imp_id</code> at the table <code>vu_imp_list</code>; <code>WHERE's second condition</code> will only extract only those records that have correspondent <code>start_date</code> and <code>imp_id</code>. In short, How to ignore this condition in case no corresponding record found in table <code>vu_imp_list</code>. I have found <a href="https://stackoverflow.com/questions/5540416/how-to-ignore-a-condition-in-where-clause">this post</a> for MySQL related but seem something wrong with it as I keep getting error <code>missing SELECT keyword</code></p> <pre><code>SELECT vil.account_id , vil.imp_id, vil.owner , vil.start_date, CASE WHEN ac.status = 4 THEN status_date ELSE NULL END AS Live_date, cs.country_code FROM ACCOUNT ac INNER JOIN vu_imp_list vil ON vil.account_id = ac.account_id INNER JOIN entity e ON ac.entity_id = e.entity_id INNER JOIN country_specifics cs ON e.country_id = cs.country_id WHERE ac.account_id IN ('000206789', '000207464', '000207696', '000207746') AND ((vil.start_date = (SELECT MIN(vils.start_date) FROM vu_imp_list vils WHERE vil.account_id = vils.account_id)) OR NOT EXISTS (vil.start_date = (SELECT MIN(vils.start_date) FROM obi.vu_implementation_list vils WHERE vil.ob10_account_id = vils.ob10_account_id) </code></pre>
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