{"id":1231,"date":"2015-05-20T23:04:34","date_gmt":"2015-05-20T15:04:34","guid":{"rendered":"http:\/\/coderbee.net\/?p=1231"},"modified":"2015-07-06T23:09:20","modified_gmt":"2015-07-06T15:09:20","slug":"%e3%80%8a%e5%9f%ba%e4%ba%8e-oracle-%e7%9a%84-sql-%e4%bc%98%e5%8c%96%e3%80%8b%e7%ac%94%e8%ae%b0-%e7%ac%ac%e4%ba%8c%e7%ab%a0-oracle-%e9%87%8c%e7%9a%84%e6%89%a7%e8%a1%8c%e8%ae%a1%e5%88%92","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/db\/20150520\/1231","title":{"rendered":"\u300a\u57fa\u4e8e Oracle \u7684 SQL \u4f18\u5316\u300b\u7b14\u8bb0 \u7b2c\u4e8c\u7ae0 Oracle \u91cc\u7684\u6267\u884c\u8ba1\u5212"},"content":{"rendered":"

\u5982\u4f55\u67e5\u770b\u6267\u884c\u8ba1\u5212\u7684\u987a\u5e8f<\/h2>\n

\u7b80\u5355\u7684\u539f\u5219\uff1a\u6839\u636e\u5f80\u53f3\u7684\u7f29\u8fdb\uff0c\u6700\u53f3\u7684\u5148\u6267\u884c\uff0c\u5373\u4ece\u53f3\u5f80\u5de6\uff1b\u7f29\u8fdb\u76f8\u540c\u7684\uff0c\u4ece\u4e0a\u5f80\u4e0b\u6267\u884c\u3002<\/p>\n

Oracle \u91cc\u7684\u5e38\u89c1\u7684\u6267\u884c\u8ba1\u5212<\/h2>\n

\u4e0e\u8868\u8bbf\u95ee\u76f8\u5173\u7684\u6267\u884c\u8ba1\u5212<\/h3>\n

\u5168\u8868\u626b\u63cf\u5bf9\u5e94\u7684\u6267\u884c\u8ba1\u5212\u5173\u952e\u8bcd\u662f\u201cTABLE ACCESS FULL\u201d\uff1b
\nrowid \u626b\u63cf\u5bf9\u5e94\u7684\u5173\u952e\u8bcd\u662f\u201cTABLE ACCESS BY USER ROWID\u201d\uff08\u76ee\u6807 SQL \u76f4\u63a5\u6307\u5b9a\u4e86 rowid\uff09\u6216 \u201cTABLE ACCESS BY INDEX ROWID\u201d\uff08\u5148\u68c0\u7d22\u7d22\u5f15\uff0c\u7136\u540e\u7528 rowid \u8bbf\u95ee\u8868\uff09\u3002<\/p>\n

\u4e0e B-tree \u76f8\u5173\u7684\u6267\u884c\u8ba1\u5212<\/h3>\n

\u8fde\u63a5\u7c7b\u578b\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u6267\u884c\u8ba1\u5212\u5173\u952e\u8bcd
\n\u6392\u5e8f\u5408\u5e76\u8fde\u63a5\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000SORT JOIN<\/code> \u548c MERGE JOIN<\/code>
\n\u5d4c\u5957\u5faa\u73af\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000NESTED LOOPS<\/code>
\n\u54c8\u5e0c\u8fde\u63a5\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000HASH JOIN<\/code>
\n\u53cd\u8fde\u63a5\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000ANTI<\/code>\uff08\u53ef\u80fd\u662f HASH JOIN ANTI, MERGE JOIN ANTI, NESTED LOOPS ANTI<\/code>\uff09
\n\u534a\u8fde\u63a5\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000SEMI<\/code>\uff08\u53ef\u80fd\u662f HASH JOIN SEMI, MERGE JOIN SEMI, NESTED JOIN SEMI<\/code>\uff09<\/p>\n

\u534a\u8fde\u63a5\u5bf9\u8fde\u63a5\u7ed3\u679c\u8fdb\u884c\u5fc5\u8981\u7684\u53bb\u91cd\u3002<\/p>\n

\u5176\u4ed6\u6267\u884c\u8ba1\u5212<\/h3>\n

<\/p>\n

    \n
  • AND-EQUAL\uff08INDEX MERGE\uff09<\/code>\uff1aAND-EQUAL<\/code> \u53c8\u79f0\u4e3a INDEX MERGE<\/code>\uff0c\u662f\u6307\u5982\u679c where \u6761\u4ef6\u91cc\u51fa\u73b0\u4e86\u591a\u4e2a\u9488\u5bf9\u4e0d\u540c\u7684\u5355\u5217\u7684\u7b49\u503c\u6761\u4ef6\uff0c\u5e76\u4e14\u8fd9\u4e9b\u5217\u4e0a\u90fd\u6709\u5355\u952e\u503c\u7684\u7d22\u5f15\uff0c\u5219 Oracle \u53ef\u80fd\u4f1a\u4ee5\u76f8\u5e94\u7684\u5355\u4e2a\u7b49\u503c\u6761\u4ef6\u53bb\u5206\u522b\u626b\u63cf\u8fd9\u4e9b\u7d22\u5f15\uff0c\u7136\u540e \u5408\u5e76\u8fd9\u4e9b\u626b\u63cf\u5355\u4e2a\u7d22\u5f15\u6240\u5f97\u5230\u7684 rowid \u96c6\u5408\uff0c\u5982\u679c\u80fd\u4ece\u8fd9\u4e9b\u96c6\u5408\u4e2d\u627e\u5230\u503c\u7cfb\u7edf\u7684 rowid\uff0c\u90a3\u4e48\u8fd9\u4e2a rowid \u5c31\u662f\u76ee\u6807 SQL \u6700\u7ec8\u6267\u884c\u7ed3\u679c\u6240\u5bf9\u5e94\u7684 rowid\u3002\u53ea\u9700\u7528\u8fd9\u4e9b rowid \u56de\u8868\u5c31\u80fd\u5f97\u5230\u6700\u7ec8\u7684\u7ed3\u679c\u3002<\/li>\n<\/ul>\n

    INDEX JOIN<\/code>\uff1a\u6307\u7684\u662f\u9488\u5bf9\u5355\u8868\u4e0a\u7684\u4e0d\u540c\u7d22\u5f15\u4e4b\u95f4\u7684\u8fde\u63a5\u3002\u5982\u679c\u76ee\u6807 SQL \u9700\u8981\u7684\u6570\u636e\u53ef\u4ee5\u4ece\u4e24\u4e2a\u5355\u952e\u503c\u7d22\u5f15\u91cc\u83b7\u5f97\uff0cOracle \u53ef\u9009\u62e9\u626b\u63cf\u8fd9\u4e24\u4e2a\u7d22\u5f15\u5f97\u5230\u4e24\u4e2a\u7ed3\u679c\u96c6\uff0c\u7136\u540e\u7528 rowid \u76f8\u7b49\u4f5c\u4e3a\u8fde\u63a5\u6761\u4ef6\u8fde\u63a5\u7740\u4e24\u4e2a\u7ed3\u679c\u96c6\uff0c\u5f97\u5230\u7684\u5c31\u662f\u6700\u7ec8\u7ed3\u679c\u96c6\u3002INDEX JOIN<\/code> \u5728\u6267\u884c\u8ba1\u5212\u4e2d\u5bf9\u5e94\u7684\u5173\u952e\u5b57\u548c\u666e\u901a\u7684\u8868\u8fde\u63a5\u4e00\u6837\uff0c\u53ea\u4e0d\u8fc7\u53c2\u4e0e\u8fde\u63a5\u7684\u5bf9\u8c61\u4e0d\u662f\u8868\u800c\u662f\u7d22\u5f15\u3002<\/p>\n

    VIEW<\/code>\uff1a\u5982\u679c Oracle \u4e0d\u80fd\u5bf9\u6d89\u53ca\u89c6\u56fe\u7684\u67e5\u8be2\u505a\u89c6\u56fe\u5408\u5e76\uff0c\u90a3\u4e48\u5c06\u628a\u8be5\u89c6\u56fe\u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53\u72ec\u7acb\u5730\u6267\u884c\uff0c\u6b64\u65f6 SQL \u6267\u884c\u8ba1\u5212\u4e2d\u5c06\u51fa\u73b0\u5173\u952e\u5b57 VIEW<\/code>\u3002<\/p>\n

    FILTER<\/code>\uff1a\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6267\u884c\u8ba1\u5212\uff0c\u5bf9\u5e94\u7684\u6267\u884c\u6b65\u9aa4\u6709\u4e09\u6b65\uff1a1\uff09\u3001\u5f97\u5230\u4e00\u4e2a\u9a71\u52a8\u7ed3\u679c\u96c6\uff1b2\uff09\u3001\u6839\u636e\u4e00\u5b9a\u7684\u8fc7\u6ee4\u6761\u4ef6\u4ece\u4e0a\u8ff0\u9a71\u52a8\u7ed3\u679c\u96c6\u4e2d\u6ee4\u9664\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\uff1b3\uff09\u3001\u7ed3\u679c\u96c6\u4e2d\u5269\u4e0b\u7684\u8bb0\u5f55\u5c31\u4f1a\u8fd4\u56de\u7ed9\u6700\u7ec8\u7528\u6237\u6216\u8005\u7ee7\u7eed\u53c2\u4e0e\u4e0b\u4e00\u4e2a\u6267\u884c\u6b65\u9aa4\u3002* FILTER<\/code> \u7c7b\u578b\u7684\u6267\u884c\u8ba1\u5212\u5b9e\u9645\u4e0a\u662f\u4e00\u79cd\u6539\u826f\u7684\u5d4c\u5957\u5faa\u73af\u8fde\u63a5\uff0c\u5b83\u5e76\u4e0d\u50cf\u5d4c\u5957\u5faa\u73af\u8fde\u63a5\u90a3\u6837\uff0c\u9a71\u52a8\u7ed3\u679c\u96c6\u4e2d\u7684\u8bb0\u5f55\u6709\u591a\u5c11\u6761\u5c31\u5f97\u8bbf\u95ee\u591a\u5c11\u6b21\u88ab\u9a71\u52a8\u8868\u3002*<\/p>\n

    SORT<\/h4>\n

    SORT \u5728\u6267\u884c\u8ba1\u5212\u4e2d\u901a\u5e38\u4ee5\u7ec4\u5408\u7684\u5f62\u5f0f\u51fa\u73b0\uff0c\u8fd9\u4e9b\u7ec4\u5408\u5f62\u5f0f\u5305\u62ec\u4f46\u4e0d\u9650\u4e8e\uff1aSORT AGGREGATE, SORT UNIQUE, SORT JOIN, SORT GROUP BY, SORT ORDER BY, BUFFER SORT<\/code>\u3002\u6267\u884c\u8ba1\u5212\u4e2d\u5373\u4f7f\u51fa\u73b0\u5173\u952e\u5b57 \u201dsort\u201c \u4e5f\u4e0d\u4e00\u5b9a\u5c31\u610f\u5473\u7740\u8981\u6392\u5e8f\uff0c\u6bd4\u5982 SORT AGGREGATE, BUFFER SORT<\/code> \u5c31\u4e0d\u4e00\u5b9a\u9700\u8981\u6392\u5e8f\u3002<\/p>\n

    \u770b\u4e00\u4e2a SQL \u662f\u5426\u6392\u5e8f\u6700\u76f4\u89c2\u7684\u65b9\u6cd5\u5c31\u662f\u67e5\u770b\u5176\u7edf\u8ba1\u4fe1\u606f\u4e2d\u201csorts(memory)\u201d\u548c\u201csorts(disk)\u201d\u7684\u503c\uff0c\u5982\u679c\u8fd9\u4e24\u4e2a\u503c\u5927\u4e8e 0\uff0c\u5219\u8bf4\u660e SQL \u7ecf\u5386\u4e86\u6392\u5e8f\u3002\u4f46\u5bf9\u4e8e BUFFER SORT<\/code> \uff0c\u8fd8\u8981\u501f\u52a9\u76ee\u6807 SQL \u771f\u5b9e\u6267\u884c\u8ba1\u5212\u4e2d\u201cColumn Projection Information\u201d\u90e8\u5206 \u201c#keys\u201d\u7684\u503c\u6765\u5224\u65ad\u6240\u5bf9\u5e94\u7684 SQL \u5230\u5e95\u6709\u6ca1\u6709\u7ecf\u5386\u6392\u5e8f\u3002<\/p>\n

    \u5bf9\u4e8e\u5305\u542b\u5173\u952e\u5b57\u201cSORT\u201d\u7684\u6267\u884c\u6b65\u9aa4\uff08\u6bd4\u5982\uff1aSORT ORDER BY, SORT AGGREGATE, BUFFER SORT<\/code> \u7b49\uff09\uff0c\u5728\u771f\u5b9e\u6267\u884c\u8ba1\u5212\u4e2d\u201c#keys\u201d\u7684\u503c\u8868\u793a\u8be5\u6267\u884c\u6b65\u9aa4\u5b9e\u9645\u62cd\u5e8f\u5217\u7684\u6570\u91cf\u3002<\/p>\n

    UNION\/UNION ALL<\/h4>\n

    UNION ALL \u4ec5\u4ec5\u662f\u7b80\u5355\u5730\u5c06\u4e24\u4e2a\u7ed3\u679c\u96c6\u5408\u5e76\uff0c\u5e76\u4e0d\u505a\u4efb\u4f55\u5904\u7406\uff1bUNION \u9664\u4e86\u5c06\u4e24\u4e2a\u7ed3\u679c\u96c6\u5408\u5e76\u4e4b\u5916\uff0c\u8fd8\u4f1a\u5bf9\u5408\u5e76\u540e\u7684\u7ed3\u679c\u96c6\u505a\u6392\u5e8f\u548c\u53bb\u91cd\uff0c\u76f8\u5f53\u4e8e\u5148\u505a UNION ALL\uff0c\u7136\u540e\u518d\u5bf9 UNION ALL \u4e4b\u540e\u7684\u7ed3\u679c\u96c6\u505a SORT UNIQUE\u3002<\/p>\n

    CONCAT<\/h4>\n

    CONCAT \u5c31\u662f IN-List \u6269\u5c55\uff08IN-List Expansion\uff09\u6216 OR \u6269\u5c55\uff08OR Expansion\uff09\uff0c\u5728\u6267\u884c\u8ba1\u5212\u4e2d\u5bf9\u5e94\u7684\u5173\u952e\u8bcd\u662f \u201cCONCATENATION\u201d\u3002<\/p>\n

    CONNECT BY<\/h4>\n

    CONNECT BY \u662f Oracle \u6570\u636e\u5e93\u4e2d\u5c42\u6b21\u67e5\u8be2\u6240\u5bf9\u5e94\u5173\u952e\u5b57\uff0c\u5728\u6267\u884c\u8ba1\u5212\u4e2d\u8868\u793a\u540c\u6837\u7684\u610f\u601d\u3002<\/p>\n\n

    \u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<\/p>\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    \u5982\u4f55\u67e5\u770b\u6267\u884c\u8ba1\u5212\u7684\u987a\u5e8f \u7b80\u5355\u7684\u539f\u5219\uff1a\u6839\u636e\u5f80\u53f3\u7684\u7f29\u8fdb\uff0c\u6700\u53f3\u7684\u5148\u6267\u884c\uff0c\u5373\u4ece\u53f3\u5f80\u5de6\uff1b\u7f29 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[99,220],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1231"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=1231"}],"version-history":[{"count":4,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1231\/revisions"}],"predecessor-version":[{"id":1243,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1231\/revisions\/1243"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=1231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=1231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=1231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}