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doc/src/sgml/ddl.sgml
@@ -546,7 +546,9 @@ CREATE TABLE products (
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<para>
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Adding a unique constraint will automatically create a unique btree
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- index on the column or group of columns used in the constraint.
+ index on the column or group of columns used in the constraint.
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+ A uniqueness constraint on only some rows can be enforced by creating
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+ a <link linkend="indexes-partial">partial index</link>.
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</para>
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<indexterm>
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