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Commit737f226

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docs: adjust multi-column most-common-value statistics
This commit adds a mention that the order of columns specified duringmulti-column most-common-value statistics is insignificant, and tries tosimplify examples.Discussion:https://postgr.es/m/20190828162238.GA8360@momjian.usBackpatch-through: 12
1 parent9d42df7 commit737f226

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‎doc/src/sgml/perform.sgml

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@@ -1172,7 +1172,7 @@ WHERE tablename = 'road';
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<para>
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Here is an example of collecting functional-dependency statistics:
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<programlisting>
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CREATE STATISTICS stts (dependencies) ONzip, city FROM zipcodes;
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CREATE STATISTICS stts (dependencies) ONcity, zip FROM zipcodes;
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ANALYZE zipcodes;
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@@ -1262,7 +1262,7 @@ SELECT * FROM zipcodes WHERE city = 'San Francisco' AND zip = '90210';
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Continuing the previous example, the n-distinct counts in a
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table of ZIP codes might look like the following:
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<programlisting>
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CREATE STATISTICS stts2 (ndistinct) ONzip, state,city FROM zipcodes;
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CREATE STATISTICS stts2 (ndistinct) ONcity, state,zip FROM zipcodes;
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ANALYZE zipcodes;
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@@ -1317,7 +1317,7 @@ nd | {"1, 2": 33178, "1, 5": 33178, "2, 5": 27435, "1, 2, 5": 33178}
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a function is required for inspection of MCV contents):
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<programlisting>
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CREATE STATISTICS stts3 (mcv) ONstate, city FROM zipcodes;
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CREATE STATISTICS stts3 (mcv) ONcity, state FROM zipcodes;
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ANALYZE zipcodes;
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‎doc/src/sgml/ref/create_statistics.sgml

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@@ -98,7 +98,8 @@ CREATE STATISTICS [ IF NOT EXISTS ] <replaceable class="parameter">statistics_na
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<listitem>
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<para>
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The name of a table column to be covered by the computed statistics.
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At least two column names must be given.
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At least two column names must be given; the order of the column names
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is insignificant.
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</para>
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</listitem>
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</varlistentry>

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