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| <section id="collation-dialog">
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| <span id="id1"></span><h1><span class="target" id="index-0"></span>Collation Dialog<a class="headerlink" href="#collation-dialog" title="Link to this heading">¶</a></h1>
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| <p>Use the <em>Collation</em> dialog to define a collation. A collation is an SQL schema
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| object that maps a SQL name to operating system locales. To create a collation,
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| you must have a CREATE privilege on the destination schema.</p>
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| <p>The <em>Collation</em> dialog organizes the development of a collation through the
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| following dialog tabs: <em>General</em> and <em>Definition</em>. The <em>SQL</em> tab displays the
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| SQL code generated by dialog selections.</p>
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| <img alt="Collation dialog general tab" class="align-center" src="_images/collation_general.png" />
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| <p>Use the fields in the <em>General</em> tab to identify the collation:</p>
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| <ul class="simple">
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| <li><p>Use the <em>Name</em> field to provide a name for the collation. The collation name
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| must be unique within a schema. The name will be displayed in the <em>pgAdmin</em>
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| tree control.</p></li>
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| <li><p>Select the name of the owner from the drop-down listbox in the <em>Owner</em> field.</p></li>
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| <li><p>Select the name of the schema in which the collation will reside from the
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| drop-down listbox in the <em>Schema</em> field.</p></li>
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| <li><p>Store notes about the collation in the <em>Comment</em> field.</p></li>
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| </ul>
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| <p>Click the <em>Definition</em> tab to continue.</p>
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| <img alt="Collation dialog definition tab" class="align-center" src="_images/collation_definition.png" />
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| <p>Use the fields in the <em>Definition</em> tab to specify the operating system locale
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| settings:</p>
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| <ul class="simple">
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| <li><p>Use the drop-down listbox next to <em>Copy collation</em> to select the name of an
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| existing collation to copy. The new collation will have the same properties
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| as the existing one, but will be an independent object. If you choose to copy
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| an existing collation, you cannot modify the collation properties displayed on
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| this tab.</p></li>
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| <li><p>Use the <em>Locale</em> field to specify a locale; a locale specifies language and
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| language formatting characteristics. If you specify this, you cannot specify
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| either of the following parameters. To view a list of locales supported by
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| your Linux system use the command <em>locale -a</em>.</p></li>
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| <li><p>Use the <em>LC_COLLATE</em> field to specify a locale with specified string sort
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| order. The locale must be applicable to the current database encoding. (See
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| CREATE DATABASE for details.)</p></li>
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| <li><p>Use the <em>LC_CTYPE</em> field to specify a locale with specified character
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| classification. The locale must be applicable to the current database encoding.
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| (See CREATE DATABASE for details.)</p></li>
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| <li><p>Use the drop-down listbox next to <em>Locale Provider</em> to select a locale services associated
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| with the collation. Possible values are: icu, libc. libc is the default.</p></li>
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| <li><p>Move the switch next to <em>Deterministic</em> to <em>YES</em> to specify whether the collation should use
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| deterministic comparisons. By default, this option is set to true. In a
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| deterministic comparison, strings that are not byte-wise equal are considered
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| unequal, even if they are considered logically equal in the comparison.</p></li>
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| <li><p>Use the <em>Rules</em> field to specify a rules for customizing the behavior of the collation.
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| It includes considerations such as character ordering, case sensitivity, and accent
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| sensitivity.</p></li>
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| <li><p>Use the <em>Version</em> field to specify version string to store with the collation object.</p></li>
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| </ul>
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| <p>Click the <em>SQL</em> tab to continue.</p>
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| <p>Your entries in the <em>Collation</em> dialog generate a SQL command (see an example b
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| elow). Use the <em>SQL</em> tab for review; revisit or switch tabs to make any changes
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| to the SQL command.</p>
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| <section id="example">
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| <h2>Example<a class="headerlink" href="#example" title="Link to this heading">¶</a></h2>
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| <p>The following is an example of the sql command generated by user selections in
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| the <em>Collation</em> dialog:</p>
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| <img alt="Collation dialog sql tab" class="align-center" src="_images/collation_sql.png" />
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| <p>The example shown demonstrates creating a collation named <em>french</em> that uses the
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| rules specified for the locale, <em>fr-BI-x-icu. The collation is owned by
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| *postgres</em>.</p>
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| <ul>
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| <li><p>Click the <em>Info</em> button (i) to access online help. For more information about
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| setting a locale, see Chapter 22.1 Locale Support of the PostgreSQL core
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| documentation:</p>
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| <blockquote>
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| <div><p><a class="reference external" href="https://www.postgresql.org/docs/current/locale.html">https://www.postgresql.org/docs/current/locale.html</a></p>
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| </div></blockquote>
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| </li>
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| <li><p>Click the <em>Save</em> button to save work.</p></li>
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| <li><p>Click the <em>Close</em> button to exit without saving work.</p></li>
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| <li><p>Click the <em>Reset</em> button to restore configuration parameters.</p></li>
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| <h3><a href="index.html">Table of Contents</a></h3>
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| <li><a class="reference internal" href="#">Collation Dialog</a><ul>
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| <li><a class="reference internal" href="#example">Example</a></li>
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