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[https://www.postgresql.org/docs/12/queries-with.html](https://www.postgresql.org/docs/12/queries-with.html)","name":"内联 WITH 查询 (公用表表达式)"}}],"GroupTitles":{"zh-Hans":"性能"},"RelatedKey":"inlined-with-queries-common-table-expressions"},"Title":"内联 WITH 查询 (公用表表达式)","TitleLocale":"zh-Hans","Group":"性能","GroupLocale":"zh-Hans","URL":"/wiki/versions/capabilities/321/?v=18","BodyLocale":"zh-Hans","MissingMessage":"","FallbackMessage":"No translation of this description is recorded. 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The source label is retained in Chinese; no translated label is recorded.","Body":{"Text":"","URL":"","Class":"","HTML":"\u003cp\u003e既非递归也没有任何副作用（例如 INSERT/UPDATE/DELETE）的 WITH 查询可以内联执行，从而带来性能改进。可以通过使用 \u0026#34;NOT MATERIALIZED\u0026#34; 子句强制对查询执行此行为，例如：\u003c/p\u003e\n\u003cpre\u003e\u003ccode\u003eWITH cte AS NOT MATERIALIZED (\n    SELECT * FROM a\n)\nSELECT * FROM cte\nJOIN b ON b.id = cte.id;\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003e更多信息请访问 \u003ca href=\"https://www.postgresql.org/docs/12/queries-with.html\" rel=\"nofollow\"\u003ehttps://www.postgresql.org/docs/12/queries-with.html\u003c/a\u003e\u003c/p\u003e\n","Present":false},"Selected":{"Version":"18","State":"no","EvidenceKind":"legacy-database:v18","TransitionVersion":"","Supported":false,"Original":0},"Observed":true,"Cells":[{"Text":"Unknown","URL":"/wiki/versions/capabilities/321/?v=20","Class":"fm_unk","HTML":"","Present":false},{"Text":"Unknown","URL":"/wiki/versions/capabilities/321/?v=19","Class":"fm_unk","HTML":"","Present":false},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=18","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=17","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=16","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=15","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=14","Class":"fm_no","HTML":"","Present":true},{"Text":"Yes","URL":"/wiki/versions/capabilities/321/?v=13","Class":"fm_yes","HTML":"","Present":true},{"Text":"Yes","URL":"/wiki/versions/capabilities/321/?v=12","Class":"fm_yes","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=11","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=10","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=9.6","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=9.5","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=9.4","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=9.3","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=9.2","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=9.1","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=9.0","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=8.4","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=8.3","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=8.2","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=8.1","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=8.0","Class":"fm_no","HTML":"","Present":true},{"Text":"No","URL":"/wiki/versions/capabilities/321/?v=7.4","Class":"fm_no","HTML":"","Present":true}],"Sources":null,"JSON":"{\n 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The original Chinese description is shown. 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The source label is retained in Chinese; no translated label is recorded.","Body":{"Text":"","URL":"","Class":"","HTML":"\u003cp\u003e查询规划器现在可以在预计聚合将超过工作内存时考虑使用哈希聚合。\u003c/p\u003e\n\u003cp\u003e这可以通过两个配置参数进行控制：\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https://www.postgresql.org/docs/13/runtime-config-query.html#GUC-ENABLE-HASHAGG\" rel=\"nofollow\"\u003eenable_hashagg\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://www.postgresql.org/docs/13/runtime-config-resource.html#GUC-HASH-MEM-MULTIPLIER\" 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