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class=\"literal\">+</code>\uff0c\u5219\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u4f1a\u8fde\u540c\u5176\u5173\u8054\u63cf\u8ff0\u4e00\u8d77\u5217\u51fa\u3002</p>\n<p lang=\"zh\">\u6bcf\u79cd\u6269\u5c55\u7edf\u8ba1\u7684\u72b6\u6001\u663e\u793a\u5728\u4ee5\u7edf\u8ba1\u79cd\u7c7b\u547d\u540d\u7684\u5217\u4e2d\uff0c\u4f8b\u5982 Ndistinct\u3002defined \u8868\u793a\u521b\u5efa\u7edf\u8ba1\u65f6\u8bf7\u6c42\u4e86\u8be5\u7edf\u8ba1\uff0cNULL \u8868\u793a\u672a\u8bf7\u6c42\u3002\u82e5\u8981\u5224\u65ad ANALYZE \u662f\u5426\u8fd0\u884c\u8fc7\u3001\u7edf\u8ba1\u662f\u5426\u53ef\u4f9b\u89c4\u5212\u5668\u4f7f\u7528\uff0c\u53ef\u67e5\u8be2 pg_stats_ext\u3002</p>\n</dd></dl></div>", "manual_path": "app-psql.html#APP-PSQL-META-COMMAND-DX-UC", "localization": {"status": "complete", "sources": [{"url": "/docs/devel/app-psql.html", "method": "same-major semantic node", "sha256": "1590b6e290ad21fe3ac1c1549628841ae426d1cd07a8f808789207878dbee5ab", "language": "zh", "matched_nodes": 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