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docs: improve 'capitals' inheritance example
Adds constraints and improves wording. Reported-by: 2552891@gmail.com Discussion: https://postgr.es/m/159586122762.680.1361378513036616007@wrigleys.postgresql.org Backpatch-through: 9.5
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@ -616,7 +616,7 @@ CREATE TABLE cities (
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);
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CREATE TABLE capitals (
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state char(2)
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state char(2) UNIQUE NOT NULL
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) INHERITS (cities);
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</programlisting>
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</para>
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@ -630,7 +630,8 @@ CREATE TABLE capitals (
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<type>text</type>, a native <productname>PostgreSQL</productname>
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type for variable length character strings. The
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<classname>capitals</classname> table has
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an extra column, <structfield>state</structfield>, which shows their states. In
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an additional column, <structfield>state</structfield>, which shows its
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state abbreviation. In
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<productname>PostgreSQL</productname>, a table can inherit from
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zero or more other tables.
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</para>
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