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                # 34.11\. `collation_character_set_applicability` 視圖`collation_character_set_applicability`指定可用的排序規則適用于哪個字符集。 在PostgreSQL中,每個數據庫只有一個字符集(參閱[Section 34.7](#calibre_link-2045)里面的說明), 所以該視圖并不提供多少有用的信息。 **Table 34-9\. `collation_character_set_applicability` 字段** | 名字 | 數據類型 | 描述 | | --- | --- | --- | | `collation_catalog` | `sql_identifier` | 包含該排序規則的數據庫的名字(總是當前數據庫) | | `collation_schema` | `sql_identifier` | 包含該排序規則的模式的名字 | | `collation_name` | `sql_identifier` | 缺省排序規則的名字 | | `character_set_catalog` | `sql_identifier` | 字符集當前沒有作為模式對象實現,所以這個字段是null。 | | `character_set_schema` | `sql_identifier` | 字符集當前沒有作為模式對象實現,所以這個字段是null。 | | `character_set_name` | `sql_identifier` | 字符集的名字 |
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