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lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/10/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n  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class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/11/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div class=\"note\">\n<h3 class=\"title\" lang=\"zh\">\u6ce8\u610f</h3>\n<p lang=\"zh\">\u5e76\u975e\u6240\u6709<span class=\"quote\">\u201c<span class=\"quote\">\u9884\u5b9a\u4e49</span>\u201d</span>\u51fd\u6570\u5728\u4e0a\u8ff0\u610f\u4e49\u4e0a\u90fd\u662f<span class=\"quote\">\u201c<span class=\"quote\">\u5185\u90e8</span>\u201d</span>\u51fd\u6570\u3002\u6709\u4e9b\u9884\u5b9a\u4e49\u7684\u51fd\u6570\u7531 SQL \u7f16\u5199\u3002</p>\n</div>\n</div>", "manual_path": "/docs/11/xfunc-internal.html", "localization": {"status": "complete", "sources": [{"url": "/docs/11/xfunc-internal.html", "method": "same-major semantic node", "sha256": "f268da7dc7fdc573c7b4272fc5d854f14270cecb7d24b750da02c3a2e33f905d", "language": "zh", "matched_nodes": ["#XFUNC-INTERNAL/div[0]", "#XFUNC-INTERNAL/div[6]/h3[0]", "#XFUNC-INTERNAL/div[6]/p[1]", "#XFUNC-INTERNAL/p[2]", "#XFUNC-INTERNAL/p[3]", "#XFUNC-INTERNAL/p[5]"]}], "language": "zh", "original_text": {"/versions/11/description/0": "built-in functions", "/versions/11/facts/0/label": "Kind", "/versions/11/facts/0/value": "Native function language", "/versions/11/facts/1/label": "Trusted", 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"validator": "fmgr_internal_validator"}, "description": ["\u5185\u7f6e\u51fd\u6570"], "manual_html": "<div class=\"sect1\" id=\"XFUNC-INTERNAL\">\n<div class=\"titlepage\">\n<div>\n<div>\n<h2 class=\"title\" lang=\"zh\">\n<div>\n<div>\n<h2 class=\"title\" style=\"clear: both\">37.9.\u00a0\u5185\u90e8\u51fd\u6570 </h2>\n</div>\n</div>\n</h2>\n</div>\n</div>\n</div>\n<p lang=\"zh\">\u5185\u90e8\u51fd\u6570\u7531 C \u7f16\u5199\u5e76\u4e14\u5df2\u7ecf\u88ab\u9759\u6001\u94fe\u63a5\u5230<span class=\"productname\">PostgreSQL</span> \u670d\u52a1\u5668\u4e2d\u3002\u8be5\u51fd\u6570\u5b9a\u4e49\u7684<span class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/12/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div class=\"note\">\n<h3 class=\"title\" lang=\"zh\">\u6ce8\u610f</h3>\n<p lang=\"zh\">\u5e76\u975e\u6240\u6709<span class=\"quote\">\u201c<span class=\"quote\">\u9884\u5b9a\u4e49</span>\u201d</span>\u51fd\u6570\u5728\u4e0a\u8ff0\u610f\u4e49\u4e0a\u90fd\u662f<span class=\"quote\">\u201c<span class=\"quote\">\u5185\u90e8</span>\u201d</span>\u51fd\u6570\u3002\u6709\u4e9b\u9884\u5b9a\u4e49\u7684\u51fd\u6570\u7531 SQL \u7f16\u5199\u3002</p>\n</div>\n</div>", "manual_path": "/docs/12/xfunc-internal.html", "localization": {"status": "complete", "sources": [{"url": "/docs/12/xfunc-internal.html", "method": "same-major semantic node", 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class=\"productname\">PostgreSQL</span> \u670d\u52a1\u5668\u4e2d\u3002\u8be5\u51fd\u6570\u5b9a\u4e49\u7684<span class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/13/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div 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"sections": [], "signature": "", "attributes": {"kind": "Native function language", "handler": "", "trusted": "f", "validator": "fmgr_internal_validator"}, "description": ["\u5185\u7f6e\u51fd\u6570"], "manual_html": "<div class=\"sect1\" id=\"XFUNC-INTERNAL\">\n<div class=\"titlepage\">\n<div>\n<div>\n<h2 class=\"title\" lang=\"zh\">\n<div>\n<div>\n<h2 class=\"title\" style=\"clear: both\">38.9.\u00a0\u5185\u90e8\u51fd\u6570 </h2>\n</div>\n</div>\n</h2>\n</div>\n</div>\n</div>\n<p lang=\"zh\">\u5185\u90e8\u51fd\u6570\u7531 C \u7f16\u5199\u5e76\u4e14\u5df2\u7ecf\u88ab\u9759\u6001\u94fe\u63a5\u5230<span class=\"productname\">PostgreSQL</span> \u670d\u52a1\u5668\u4e2d\u3002\u8be5\u51fd\u6570\u5b9a\u4e49\u7684<span class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/14/creating-cluster.html\" title=\"19.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a019.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div class=\"note\">\n<h3 class=\"title\" lang=\"zh\">\u6ce8\u610f</h3>\n<p lang=\"zh\">\u5e76\u975e\u6240\u6709<span class=\"quote\">\u201c<span class=\"quote\">\u9884\u5b9a\u4e49</span>\u201d</span>\u51fd\u6570\u5728\u4e0a\u8ff0\u610f\u4e49\u4e0a\u90fd\u662f<span class=\"quote\">\u201c<span class=\"quote\">\u5185\u90e8</span>\u201d</span>\u51fd\u6570\u3002\u6709\u4e9b\u9884\u5b9a\u4e49\u7684\u51fd\u6570\u7531 SQL 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both\">38.9.\u00a0\u5185\u90e8\u51fd\u6570 </h2>\n</div>\n</div>\n</h2>\n</div>\n</div>\n</div>\n<p lang=\"zh\">\u5185\u90e8\u51fd\u6570\u7531 C \u7f16\u5199\u5e76\u4e14\u5df2\u7ecf\u88ab\u9759\u6001\u94fe\u63a5\u5230<span class=\"productname\">PostgreSQL</span> \u670d\u52a1\u5668\u4e2d\u3002\u8be5\u51fd\u6570\u5b9a\u4e49\u7684<span class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/15/creating-cluster.html\" title=\"19.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a019.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n  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class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/16/creating-cluster.html\" title=\"19.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a019.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div class=\"note\">\n<h3 class=\"title\" lang=\"zh\">\u6ce8\u610f</h3>\n<p lang=\"zh\">\u5e76\u975e\u6240\u6709<span class=\"quote\">\u201c<span class=\"quote\">\u9884\u5b9a\u4e49</span>\u201d</span>\u51fd\u6570\u5728\u4e0a\u8ff0\u610f\u4e49\u4e0a\u90fd\u662f<span class=\"quote\">\u201c<span class=\"quote\">\u5185\u90e8</span>\u201d</span>\u51fd\u6570\u3002\u6709\u4e9b\u9884\u5b9a\u4e49\u7684\u51fd\u6570\u7531 SQL \u7f16\u5199\u3002</p>\n</div>\n</div>", "manual_path": "/docs/16/xfunc-internal.html", "localization": {"status": "complete", "sources": [{"url": "/docs/16/xfunc-internal.html", "method": "same-major semantic node", "sha256": "7b46f7f93047e7f3362e01ed064135f6e547aeb54a18b5061687954f60275c8c", "language": "zh", "matched_nodes": ["#XFUNC-INTERNAL/div[0]", "#XFUNC-INTERNAL/div[6]/h3[0]", "#XFUNC-INTERNAL/div[6]/p[1]", "#XFUNC-INTERNAL/p[2]", "#XFUNC-INTERNAL/p[3]", "#XFUNC-INTERNAL/p[5]"]}], "language": "zh", "original_text": {"/versions/16/description/0": "built-in functions", "/versions/16/facts/0/label": "Kind", "/versions/16/facts/0/value": "Native function language", "/versions/16/facts/1/label": "Trusted", 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"validator": "fmgr_internal_validator"}, "description": ["\u5185\u7f6e\u51fd\u6570"], "manual_html": "<div class=\"sect1\" id=\"XFUNC-INTERNAL\">\n<div class=\"titlepage\">\n<div>\n<div>\n<h2 class=\"title\" lang=\"zh\">\n<div>\n<div>\n<h2 class=\"title\" style=\"clear: both\">36.9.\u00a0\u5185\u90e8\u51fd\u6570 </h2>\n</div>\n</div>\n</h2>\n</div>\n</div>\n</div>\n<p lang=\"zh\">\u5185\u90e8\u51fd\u6570\u7531 C \u7f16\u5199\u5e76\u4e14\u5df2\u7ecf\u88ab\u9759\u6001\u94fe\u63a5\u5230<span class=\"productname\">PostgreSQL</span> \u670d\u52a1\u5668\u4e2d\u3002\u8be5\u51fd\u6570\u5b9a\u4e49\u7684<span class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/17/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div class=\"note\">\n<h3 class=\"title\" lang=\"zh\">\u6ce8\u610f</h3>\n<p lang=\"zh\">\u5e76\u975e\u6240\u6709<span class=\"quote\">\u201c<span class=\"quote\">\u9884\u5b9a\u4e49</span>\u201d</span>\u51fd\u6570\u5728\u4e0a\u8ff0\u610f\u4e49\u4e0a\u90fd\u662f<span class=\"quote\">\u201c<span class=\"quote\">\u5185\u90e8</span>\u201d</span>\u51fd\u6570\u3002\u6709\u4e9b\u9884\u5b9a\u4e49\u7684\u51fd\u6570\u7531 SQL \u7f16\u5199\u3002</p>\n</div>\n</div>", "manual_path": "/docs/17/xfunc-internal.html", "localization": {"status": "complete", "sources": [{"url": "/docs/17/xfunc-internal.html", "method": "same-major semantic node", 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class=\"productname\">PostgreSQL</span> \u670d\u52a1\u5668\u4e2d\u3002\u8be5\u51fd\u6570\u5b9a\u4e49\u7684<span class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/18/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div 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\u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/19/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div class=\"note\">\n<h3 class=\"title\" lang=\"zh\">\u6ce8\u610f</h3>\n<p lang=\"zh\">\u5e76\u975e\u6240\u6709<span class=\"quote\">\u201c<span class=\"quote\">\u9884\u5b9a\u4e49</span>\u201d</span>\u51fd\u6570\u5728\u4e0a\u8ff0\u610f\u4e49\u4e0a\u90fd\u662f<span class=\"quote\">\u201c<span class=\"quote\">\u5185\u90e8</span>\u201d</span>\u51fd\u6570\u3002\u6709\u4e9b\u9884\u5b9a\u4e49\u7684\u51fd\u6570\u7531 SQL 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class=\"titlepage\">\n<div>\n<div>\n<h2 class=\"title\" lang=\"zh\">\n<div>\n<div>\n<h2 class=\"title\" style=\"clear: both\">36.9.\u00a0\u5185\u90e8\u51fd\u6570 </h2>\n</div>\n</div>\n</h2>\n</div>\n</div>\n</div>\n<p lang=\"zh\">\u5185\u90e8\u51fd\u6570\u7531 C \u7f16\u5199\u5e76\u4e14\u5df2\u7ecf\u88ab\u9759\u6001\u94fe\u63a5\u5230<span class=\"productname\">PostgreSQL</span> \u670d\u52a1\u5668\u4e2d\u3002\u8be5\u51fd\u6570\u5b9a\u4e49\u7684<span class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/devel/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 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class=\"productname\">PostgreSQL</span> \u670d\u52a1\u5668\u4e2d\u3002\u8be5\u51fd\u6570\u5b9a\u4e49\u7684<span class=\"quote\">\u201c<span class=\"quote\">\u4e3b\u4f53</span>\u201d</span>\u6307\u5b9a\u8be5\u51fd\u6570\u7684 C \u8bed\u8a00\u540d\u79f0\uff0c\u5b83\u4e0d\u5fc5\u4e0e\u4e3a SQL \u4f7f\u7528\u800c\u58f0\u660e\u7684\u540d\u79f0\u76f8\u540c\u3002\uff08\u51fa\u4e8e\u5411\u540e\u517c\u5bb9\u7684\u539f\u56e0\uff0c\u4e5f\u63a5\u53d7\u7a7a\u4e3b\u4f53\uff0c\u6b64\u65f6\u4f1a\u8ba4\u4e3a C \u8bed\u8a00\u51fd\u6570\u540d\u4e0e SQL \u51fd\u6570\u540d\u76f8\u540c\u3002\uff09</p>\n<p lang=\"zh\">\u901a\u5e38\uff0c\u6240\u6709\u5b58\u5728\u4e8e\u670d\u52a1\u5668\u4e2d\u7684\u5185\u90e8\u51fd\u6570\u90fd\u5728\u6570\u636e\u5e93\u96c6\u7c07\u7684\u521d\u59cb\u5316\uff08\u89c1<a class=\"xref\" href=\"/docs/18/creating-cluster.html\" title=\"18.2.\u00a0\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\u96c6\u7c07\">\u7b2c\u00a018.2\u00a0\u8282</a>\uff09\u671f\u95f4\u88ab\u58f0\u660e\uff0c\u4f46\u662f\u7528\u6237\u53ef\u4ee5\u4f7f\u7528 <code class=\"command\">CREATE FUNCTION</code>\u4e3a\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u521b\u5efa\u989d\u5916\u7684\u522b\u540d\u3002\u5728<code class=\"command\">CREATE FUNCTION</code>\u4e2d\u7528\u8bed\u8a00\u540d<code class=\"literal\">internal</code>\u6765\u58f0\u660e\u5185\u90e8\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u8981\u4e3a <code class=\"function\">sqrt</code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u522b\u540d\uff1a</p>\n<pre class=\"programlisting\">CREATE FUNCTION square_root(double precision) RETURNS double precision\n    AS 'dsqrt'\n    LANGUAGE internal\n    STRICT;\n</pre>\n<p lang=\"zh\">\uff08\u5927\u90e8\u5206\u5185\u90e8\u51fd\u6570\u5e94\u8be5\u88ab\u58f0\u660e\u4e3a<span class=\"quote\">\u201c<span class=\"quote\">\u4e25\u683c</span>\u201d</span>\uff09\u3002</p>\n<div 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