{"id":411,"date":"2011-03-22T17:51:09","date_gmt":"2011-03-22T09:51:09","guid":{"rendered":"http:\/\/nick.workao.org\/?p=411"},"modified":"2011-03-22T17:51:09","modified_gmt":"2011-03-22T09:51:09","slug":"%e8%bd%ac%e6%80%bb%e7%bb%93sqlite%e4%b8%8d%e6%94%af%e6%8c%81%e7%9a%84sql%e8%af%ad%e6%b3%95%e6%9c%89%e5%93%aa%e4%ba%9b","status":"publish","type":"post","link":"https:\/\/nick.txtcc.com\/index.php\/db\/411","title":{"rendered":"[\u8f6c]\u603b\u7ed3SQLite\u4e0d\u652f\u6301\u7684SQL\u8bed\u6cd5\u6709\u54ea\u4e9b"},"content":{"rendered":"<div id=\"articleBody\">\n\n1 TOP\n\u8fd9\u662f\u4e00\u4e2a\u5927\u5bb6\u7ecf\u5e38\u95ee\u5230\u7684\u95ee\u9898\uff0c\u4f8b\u5982\u5728SQLSERVER\u4e2d\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u8bed\u53e5\u6765\u53d6\u5f97\u8bb0\u5f55\u96c6\u4e2d\u7684\u524d\u5341\u6761\u8bb0\u5f55\uff1a\nSELECT TOP 10 * FROM [index] ORDER BY indexid DESC;\n\u4f46\u662f\u8fd9\u6761SQL\u8bed\u53e5\u5728SQLite\u4e2d\u662f\u65e0\u6cd5\u6267\u884c\u7684\uff0c\u5e94\u8be5\u6539\u4e3a\uff1a\nSELECT * FROM [index] ORDER BY indexid DESC limit 0,10;\n\u5176\u4e2dlimit 0,10\u8868\u793a\u4ece\u7b2c0\u6761\u8bb0\u5f55\u5f00\u59cb\uff0c\u5f80\u540e\u4e00\u5171\u8bfb\u53d610\u6761\n\n2 \u521b\u5efa\u89c6\u56fe\uff08Create View\uff09\nSQLite\u5728\u521b\u5efa\u591a\u8868\u89c6\u56fe\u7684\u65f6\u5019\u6709\u4e00\u4e2aBUG\uff0c\u95ee\u9898\u5982\u4e0b\uff1a\nCREATE VIEW watch_single AS SELECT DISTINCTwatch_item.[watchid],watch_item.[itemid] FROM watch_item;\n\u4e0a\u9762\u8fd9\u6761SQL\u8bed\u53e5\u6267\u884c\u540e\u4f1a\u663e\u793a\u6210\u529f\uff0c\u4f46\u662f\u5b9e\u9645\u4e0a\u9664\u4e86\nSELECT COUNT(*) FROM [watch_single ] WHERE watch_ single.watchid = 1;\n\u80fd\u6267\u884c\u4e4b\u5916\u662f\u65e0\u6cd5\u6267\u884c\u5176\u4ed6\u4efb\u4f55\u8bed\u53e5\u7684\u3002\u5176\u539f\u56e0\u5728\u4e8e\u5efa\u7acb\u89c6\u56fe\u7684\u65f6\u5019\u6307\u5b9a\u4e86\u5b57\u6bb5\u6240\u5728\u7684\u8868\u540d\uff0c\u800cSQLite\u5e76\u4e0d\u80fd\u6b63\u786e\u5730\u8bc6\u522b\u5b83\u3002\u6240\u4ee5\u4e0a\u9762\u7684\u521b\u5efa\u8bed\u53e5\u8981\u6539\u4e3a\uff1a\nCREATE VIEW watch_single AS SELECT DISTINCT [watchid],[itemid] FROM watch_item;\n\u4f46\u662f\u968f\u4e4b\u800c\u6765\u7684\u95ee\u9898\u662f\u5982\u679c\u662f\u591a\u8868\u7684\u89c6\u56fe\uff0c\u4e14\u8868\u95f4\u6709\u91cd\u540d\u5b57\u6bb5\u7684\u65f6\u5019\u8be5\u600e\u4e48\u529e\uff1f\n\n3 COUNT\uff08DISTINCT column\uff09\nSQLite\u5728\u6267\u884c\u5982\u4e0b\u8bed\u53e5\u7684\u65f6\u5019\u4f1a\u62a5\u9519\uff1a\nSELECT COUNT(DISTINCT watchid) FROM [watch_item] WHERE watch_item.watchid = 1;\n\u5176\u539f\u56e0\u662fSQLite\u7684\u6240\u6709\u5185\u7f6e\u51fd\u6570\u90fd\u4e0d\u652f\u6301DISTINCT\u9650\u5b9a\uff0c\u6240\u4ee5\u5982\u679c\u8981\u7edf\u8ba1\u4e0d\u91cd\u590d\u7684\u8bb0\u5f55\u6570\u7684\u65f6\u5019\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9ebb\u70e6\u3002\u6bd4\u8f83\u53ef\u884c\u7684\u505a\u6cd5\u662f\u5148\u5efa\u7acb\u4e00\u4e2a\u4e0d\u91cd\u590d\u7684\u8bb0\u5f55\u8868\u7684\u89c6\u56fe\uff0c\u7136\u540e\u518d\u5bf9\u8be5\u89c6\u56fe\u8fdb\u884c\u8ba1\u6570\u3002\n\n4 \u5916\u8fde\u63a5\n\u867d\u7136SQLite\u5b98\u65b9\u5df2\u7ecf\u58f0\u79f0LEFT OUTER JOIN \u5df2\u7ecf\u5b9e\u73b0\uff0c\u4f46\u8fd8\u6ca1\u6709 RIGHT OUTER JOIN \u548c FULL OUTER JOIN\u3002\u4f46\u662f\u5b9e\u9645\u6d4b\u8bd5\u8868\u660e\u4f3c\u4e4e\u5e76\u4e0d\u80fd\u591f\u6b63\u5e38\u7684\u5de5\u4f5c\u3002\u4ee5\u4e0b\u4e09\u6761\u8bed\u53e5\u5728\u6267\u884c\u7684\u65f6\u5019\u5747\u4f1a\u62a5\u9519\uff1a\nSELECT tags.[tagid] FROM [tags],[tag_rss] WHERE tags.[tagid] = tag_rss.[tagid](*);\nSELECT tags.[tagid] FROM [tags],[tag_rss] WHERE LEFT OUTER JOIN tag_rss.[tagid] = tags.[tagid];\nSELECT tags.[tagid] FROM [tags],[tag_rss] WHERE LEFT JOIN tag_rss.[tagid] = tags.[tagid];\n\u6b64\u5916\u7ecf\u8fc7\u6d4b\u8bd5\u7528+\u53f7\u4ee3\u66ff*\u53f7\u4e5f\u662f\u4e0d\u53ef\u884c\u7684\u3002\n\n\u00a0\n\n<strong>\u6536\u96c6<em>SQLite\u4e0eSql Server\u7684\u8bed\u6cd5\u5dee\u5f02<\/em><\/strong>\n\n<strong><em> <\/em><\/strong>\n\n1.\u8fd4\u56de\u6700\u540e\u63d2\u5165\u7684\u6807\u8bc6\u503c\n\u8fd4\u56de\u6700\u540e\u63d2\u5165\u7684\u6807\u8bc6\u503csql server\u7528@@IDENTITY\nsqlite\u7528\u6807\u91cf\u51fd\u6570LAST_INSERT_ROWID()\n\u8fd4\u56de\u901a\u8fc7\u5f53\u524d\u7684 SQLConnection \u63d2\u5165\u5230\u6570\u636e\u5e93\u7684\u6700\u540e\u4e00\u884c\u7684\u884c\u6807\u8bc6\u7b26\uff08\u751f\u6210\u7684\u4e3b\u952e\uff09\u3002\u6b64\u503c\u4e0e SQLConnection.lastInsertRowID \u5c5e\u6027\u8fd4\u56de\u7684\u503c\u76f8\u540c\u3002\n\n2.top n\n\u5728sql server\u4e2d\u8fd4\u56de\u524d2\u884c\u53ef\u4ee5\u8fd9\u6837\uff1a\nselect top 2 * from aa\norder by ids desc\n\nsqlite\u4e2d\u7528LIMIT\uff0c\u8bed\u53e5\u5982\u4e0b\uff1a\nselect * from aa\norder by ids desc\nLIMIT 2\n\n3.GETDATE ( )\n\u5728sql server\u4e2dGETDATE ( )\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\u548c\u65f6\u95f4\nsqlite\u4e2d\u6ca1\u6709\n\n4.EXISTS\u8bed\u53e5\nsql server\u4e2d\u5224\u65ad\u63d2\u5165\uff08\u4e0d\u5b58\u5728ids=5\u7684\u5c31\u63d2\u5165\uff09\nIF NOT EXISTS (select * from aa where ids=5)\nBEGIN\ninsert into aa(nickname)\nselect &#8216;t&#8217;\nEND\n\u5728sqlite\u4e2d\u53ef\u4ee5\u8fd9\u6837\ninsert into aa(nickname)\nselect &#8216;t&#8217;\nwhere not exists(select * from aa where ids=5)\n\n5.\u5d4c\u5957\u4e8b\u52a1\nsqlite\u4ec5\u5141\u8bb8\u5355\u4e2a\u6d3b\u52a8\u7684\u4e8b\u52a1\n\n6.RIGHT \u548c FULL OUTER JOIN\nsqlite\u4e0d\u652f\u6301 RIGHT OUTER JOIN \u6216 FULL OUTER JOIN\n\n7.\u53ef\u66f4\u65b0\u7684\u89c6\u56fe\nsqlite\u89c6\u56fe\u662f\u53ea\u8bfb\u7684\u3002\u4e0d\u80fd\u5bf9\u89c6\u56fe\u6267\u884c DELETE\u3001INSERT \u6216 UPDATE \u8bed\u53e5\uff0csql server\u662f\u53ef\u4ee5\u5bf9\u89c6\u56fe DELETE\u3001INSERT \u6216 UPDATE\n\n<\/div>","protected":false},"excerpt":{"rendered":"<p>1 TOP \u8fd9\u662f\u4e00\u4e2a\u5927\u5bb6\u7ecf\u5e38\u95ee\u5230\u7684\u95ee\u9898\uff0c\u4f8b\u5982\u5728SQLSERVER\u4e2d\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u8bed\u53e5\u6765\u53d6\u5f97\u8bb0\u5f55\u96c6\u4e2d\u7684\u524d\u5341\u6761\u8bb0\u5f55\uff1a SELECT TOP 10 * FROM [index] ORDER BY indexi&#46;&#46;&#46;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[256,255,258,257],"class_list":["post-411","post","type-post","status-publish","format-standard","hentry","category-db","tag-sql","tag-sqlite","tag-258","tag-257"],"_links":{"self":[{"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/posts\/411","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/comments?post=411"}],"version-history":[{"count":2,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/posts\/411\/revisions"}],"predecessor-version":[{"id":413,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/posts\/411\/revisions\/413"}],"wp:attachment":[{"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/media?parent=411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/categories?post=411"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/tags?post=411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}