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\u5f62\u5f0f\uff0c\u5219\u4f1a\u663e\u793a\u6bcf\u4e2a\u51fd\u6570\u7684\u9644\u52a0\u4fe1\u606f\uff0c\u5305\u62ec\u6613\u53d8\u6027\u3001\u5e76\u884c\u5b89\u5168\u6027\u3001\u6240\u6709\u8005\u3001\u5b89\u5168\u5206\u7c7b\u3001\u8bbf\u95ee\u6743\u9650\u3001\u8bed\u8a00\u3001\u5185\u90e8\u540d\u79f0\uff08\u4ec5\u9002\u7528\u4e8e C \u548c internal \u51fd\u6570\uff09\u4ee5\u53ca\u63cf\u8ff0\u3002\u7279\u5b9a\u51fd\u6570\u7684\u6e90\u4ee3\u7801\u53ef\u901a\u8fc7 \\sf \u67e5\u770b\u3002"], "comparison_hash": "314c1566f177cbcf646299c327832eaca6dceaa4b8d02010c0aa8c2c10b9f8b5"}, "18": {"facts": [{"label": "\u5ba2\u6237\u7aef", "value": "psql 18.6"}, {"label": "\u533a\u5206\u5927\u5c0f\u5199\u7684\u5199\u6cd5", "value": "\\df"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "label": "18.6", "major": "18", "channel": "stable", "manifest": {"pdf": {"A4": {"url": "/files/documentation/pdf/18/postgresql-18-A4.pdf", "bytes": 15865106, "pages": 3154, 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\uff0c\u5219\u53ea\u663e\u793a\u540d\u79f0\u4e0e\u6a21\u5f0f\u5339\u914d\u7684\u51fd\u6570\u3002\u4efb\u4f55\u9644\u52a0\u53c2\u6570\u90fd\u662f\u7c7b\u578b\u540d\u6a21\u5f0f\uff0c\u5206\u522b\u4e0e\u51fd\u6570\u7b2c\u4e00\u3001\u7b2c\u4e8c\u7b49\u53c2\u6570\u7684\u7c7b\u578b\u540d\u5339\u914d\u3002\uff08\u5339\u914d\u5230\u7684\u51fd\u6570\u53ef\u4ee5\u6bd4\u4f60\u6307\u5b9a\u7684\u53c2\u6570\u66f4\u591a\uff1b\u82e5\u8981\u9632\u6b62\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u5c06\u8fde\u5b57\u7b26 - \u5199\u6210\u6700\u540e\u4e00\u4e2a arg_pattern \u3002\uff09\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u53ea\u663e\u793a\u7528\u6237\u521b\u5efa\u7684\u5bf9\u8c61\uff1b\u63d0\u4f9b\u6a21\u5f0f\u6216 S \u4fee\u9970\u7b26\u53ef\u5305\u62ec\u7cfb\u7edf\u5bf9\u8c61\u3002\u5982\u679c\u5728\u547d\u4ee4\u540d\u540e\u8ffd\u52a0 x \uff0c\u7ed3\u679c\u4f1a\u4ee5\u6269\u5c55\u6a21\u5f0f\u663e\u793a\u3002\u5982\u679c\u5728\u547d\u4ee4\u540d\u540e\u8ffd\u52a0 + 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