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    <p>Your query is broken in several places. It could look something like this:</p> <pre><code>UPDATE trk2 SET (id, track_id, track_point) = (next_id, x.track_fid, x.wkb_geometry) FROM ( SELECT id ,nextval('seq_id') AS next_id ,track_fid ,wkb_geometry FROM track_points_1 WHERE track_fid = 0 ) x WHERE trk2.id = x.id; -- adapt to your case </code></pre> <p>Or <em>simpler</em> (preferable syntax):</p> <pre><code>UPDATE trk2 SET (id, track_id, track_point) = (nextval('seq_id'), x.track_fid, x.wkb_geometry) FROM track_points_1 x WHERE x.track_fid = 0 AND trk2.id = x.id; -- adapt to your case </code></pre> <h3>Major points:</h3> <ul> <li><p>An <code>UPDATE</code> without a <code>WHERE</code> clause only makes sense if you really need to change each and every row in the table. Else it is wrong or at least sub-optimal.</p> <p>When you retrieve values from another table, you get a <code>CROSS JOIN</code> between target and source if you don't add a <code>WHERE</code> clause connecting target with source - meaning that every row of the target table will be updated with every row in the source table. This can take a very long time and lead to arbitrary results. The last <code>UPDATE</code> wins. In short: this is almost always complete nonsense and extremely expensive at that.</p> <p>In my example I link target and source by the <code>id</code> column. You have to replace that with whatever fits in your case.</p></li> <li><p>You <em>can</em> assign multiple values in one <code>SET</code> clause in an <code>UPDATE</code>, but you can only return a single value from a correlated subselect expression. Therefore, it is strictly not possible to have a subselect in a <code>SET</code> clause with multiple values.</p></li> <li><p>Your initial syntax error comes from a missing pair of parenthesis around your subselect. But adding that only reveals the error mentioned above.</p></li> <li><p>Depending on what you are after, you would include <code>nextval('seq_id')</code> in the subquery or in the <code>SET</code> clause directly. This can lead to very different results, especially when you have rows in the subquery that are not used in the <code>UPDATE</code>. </p> <p>I placed it in the <code>SET</code> clause because I suspect, that's what you want. The sequence of rows is still arbitrary. If you want more control over which numbers are assigned, you need to define what you want and then take a different route.</p></li> </ul>
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