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POHow to query if either EMPLOYEE.EMAIL1 or EMPLOYEE.EMAIL2 do not have a matching entry?
 

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  1. POHow to query if either EMPLOYEE.EMAIL1 or EMPLOYEE.EMAIL2 do not have a matching entry?
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    <p>In continuation to a question posted by me on <a href="https://stackoverflow.com/q/4612710/181870">Can my use case explained be solved in a single query without affecting performance?</a>, I've a different requirement now and I wonder whether this could be again solved in a single query without affecting performance. My new requirement explained below:</p> <p>There are 2 tables involved:</p> <pre><code>Table 1: EMPLOYEE (column1, column2, email1, email2, column5, column6) Table 2: EMAILLIST (email) </code></pre> <p>My new requirement is, if <em>both</em> EMPLOYEE.EMAIL1 and EMPLOYEE.EMAIL2 have a matching entry in EMAILLIST table, then this row should be ignored. Hence, if either EMPLOYEE.EMAIL1 or EMPLOYEE.EMAIL2 do not have a matching entry (which means atleast one of the column will have a matching entry), I expect this row should be returned. Because either one of the email do not have a matching entry, I need a identification in SELECT clause itself on which email (email1 or email2) did not have a matching entry in EMAILLIST table.</p> <p><strong>Example:</strong> </p> <pre><code>INSERT INTO EMAILLIST (email) VALUES ('test1@domain.com'); INSERT INTO EMPLOYEE (column1, column2, email1, email2, column5, column6) VALUES ('c1', 'c2', 'test1@domain.com', 'test2@domain.com', 'c5', 'c6'); </code></pre> <p>I expect to return with some identification in query output on which one of the email do not have a matching entry like this:</p> <pre><code>EMAIL1 | EMAIL2 | EMAIL1MATCHED | EMAIL2MATCHED test1@domain.com | test2@domain.com | Yes | No </code></pre> <p>We're using PostgreSQL v8.2.3, if it matters.</p> <p><strong>UPDATE:</strong> My table size are little huge: EMPLOYEE has got 165018 records and EMAILLIST has got 1810228 records</p>
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