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doc: adjust DECLARE docs to mention FOR UPDATE behavior
Reported-by: Peter Eisentraut Discussion: https://postgr.es/m/8dc63ba7-dc56-fc7c-fc16-4fae03e3bfe6@2ndquadrant.com Author: Peter Eisentraut, Tom Lane, me Backpatch-through: 9.3
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@ -271,7 +271,8 @@ DECLARE <replaceable class="parameter">name</replaceable> [ BINARY ] [ INSENSITI
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and not use grouping or <literal>ORDER BY</>). Cursors
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that are not simply updatable might work, or might not, depending on plan
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choice details; so in the worst case, an application might work in testing
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and then fail in production.
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and then fail in production. If <literal>FOR UPDATE</literal> is
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specified, the cursor is guaranteed to be updatable.
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</para>
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<para>
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