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9751233
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2012-03-17T15:31:26.993
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2012-03-17T15:31:26.993
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<p>A solution using good ol'-fashioned <code>LEFT JOIN</code> -- note in the example below, only the first row of BBB is inserted into AAA, because only it has no matching row in AAA. You'd replace <code>col1</code> and <code>col2</code> with the actual columns of the tables.</p> <pre><code>> select * from AAA; +---------------------+------+------+ | timestamp | col1 | col2 | +---------------------+------+------+ | 2012-03-17 08:17:22 | 1 | 1 | | 2012-03-17 08:17:27 | 1 | 2 | | 2012-03-17 08:17:30 | 1 | 3 | | 2012-03-17 08:17:32 | 1 | 4 | | 2012-03-17 08:17:49 | 2 | 2 | | 2012-03-17 08:17:52 | 2 | 3 | | 2012-03-17 08:17:54 | 2 | 4 | +---------------------+------+------+ 7 rows in set (0.00 sec) > select * from BBB; +---------------------+------+------+ | timestamp | col1 | col2 | +---------------------+------+------+ | 2012-03-17 08:18:16 | 2 | 1 | | 2012-03-17 08:18:18 | 2 | 2 | | 2012-03-17 08:18:20 | 2 | 3 | +---------------------+------+------+ 3 rows in set (0.00 sec) > INSERT INTO AAA SELECT BBB.* FROM BBB LEFT JOIN AAA USING(col1,col2) WHERE AAA.timestamp IS NULL; > select * from AAA; +---------------------+------+------+ | timestamp | col1 | col2 | +---------------------+------+------+ | 2012-03-17 08:17:22 | 1 | 1 | | 2012-03-17 08:17:27 | 1 | 2 | | 2012-03-17 08:17:30 | 1 | 3 | | 2012-03-17 08:17:32 | 1 | 4 | | 2012-03-17 08:17:49 | 2 | 2 | | 2012-03-17 08:17:52 | 2 | 3 | | 2012-03-17 08:17:54 | 2 | 4 | | 2012-03-17 08:18:16 | 2 | 1 | +---------------------+------+------+ 8 rows in set (0.00 sec) </code></pre>
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1. POmerging content of two tables without duplicating content
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1. COUSING() is not supported in MSSQL. IIRC, it's a feature of MySQL. But I do like your join method, the syntax is less verbose but cleaner than a correlated subquery.
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2. CO@richardtallent could you use ON() rather than USING() in MSSQL?
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