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doc: more replacement of <literal> with something better
Reported-by: Alexander Law Author: Alexander Law Backpatch-through: 9.6
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@ -101,7 +101,7 @@ SELECT SESSION_USER, CURRENT_USER;
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The SQL standard allows some other expressions to appear in place
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of the literal <replaceable>user_name</replaceable>, but these options
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are not important in practice. <productname>PostgreSQL</productname>
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allows identifier syntax (<literal>"username"</literal>), which SQL
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allows identifier syntax (<literal>"<replaceable>username</>"</literal>), which SQL
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does not. SQL does not allow this command during a transaction;
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<productname>PostgreSQL</productname> does not make this
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restriction because there is no reason to.
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