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POHow to select rows from 2 tables where 1 column from each can be merged via common purpose?
 

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  1. POHow to select rows from 2 tables where 1 column from each can be merged via common purpose?
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    <p>I have 2 tables with similar, but different data. Both tables have an insert timestamp column of their own.</p> <pre><code>Table A Table B +------------+----------+ +------------+----------+ | a_created | a_data | | b_created | b_data | +------------+----------+ +------------+----------+ | 2012-09-01 | A | | 2012-09-03 | C | | 2012-09-05 | B | | 2012-09-04 | D | +------------+----------+ +------------+----------+ </code></pre> <p>I'd like to get all the data from these tables, sorted via a merged date column by the two creation dates. I.e. I want the following results</p> <pre><code>+------------+----------+----------+ | x_created | a_data | b_data | +------------+----------+----------+ | 2012-09-01 | A | NULL | | 2012-09-03 | NULL | C | | 2012-09-04 | NULL | D | | 2012-09-05 | B | NULL | +------------+----------+----------+ </code></pre> <p>Is this even possible without altering the schema? If so, how?</p>
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