{"id":67723,"date":"2026-01-29T04:25:00","date_gmt":"2026-01-28T20:25:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/67723.html"},"modified":"2026-01-29T04:25:00","modified_gmt":"2026-01-28T20:25:00","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e7%b3%bb%e5%88%972-%e7%ae%80%e5%8d%95%e6%9f%a5%e8%af%a2%ef%bc%9a%e6%8a%8a%e6%95%b0%e6%8d%ae%e6%8b%bf%e5%87%ba%e6%9d%a5%ef%bc%88select","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/67723.html","title":{"rendered":"\u6570\u636e\u5e93\u7cfb\u52172\u2014\u2014\u7b80\u5355\u67e5\u8be2\uff1a\u628a\u6570\u636e\u201c\u62ff\u51fa\u6765\u201d\uff08SELECT \u57fa\u7840\u80fd\u529b\u4e00\u6b21\u8bb2\u900f\uff09"},"content":{"rendered":"<h2>\u6570\u636e\u5e93\u7cfb\u52172\u2014\u2014\u7b80\u5355\u67e5\u8be2&#xff1a;\u628a\u6570\u636e\u201c\u62ff\u51fa\u6765\u201d&#xff08;SELECT \u57fa\u7840\u80fd\u529b\u4e00\u6b21\u8bb2\u900f&#xff09;<\/h2>\n<p>\u672c\u6587\u662f\u3010\u6570\u636e\u5e93\u5de5\u7a0b\u7cfb\u5217\u3011\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<p>\u5728\u4e0a\u4e00\u7bc7\u4e2d\u7ed9 AI \u5de5\u7a0b\u5e08\u7684 SQL \u5165\u95e8&#xff08;\u5de5\u7a0b\u7ea7\u7406\u89e3\u7248&#xff09;&#xff0c;\u6211\u4eec\u660e\u786e\u4e86 SQL \u5728\u5de5\u7a0b\u4e2d\u7684\u89d2\u8272\u3002 \u4ece\u8fd9\u4e00\u7bc7\u5f00\u59cb&#xff0c;\u8fdb\u5165\u771f\u6b63\u7684\u5b9e\u64cd\u9636\u6bb5\u3002<\/p>\n<p>\u8fd9\u4e00\u7bc7\u53ea\u89e3\u51b3\u4e00\u4ef6\u4e8b&#xff1a; \u5982\u4f55\u5728\u5de5\u7a0b\u4e2d&#xff0c;\u5b89\u5168\u3001\u53ef\u63a7\u5730\u628a\u6570\u636e\u62ff\u51fa\u6765\u3002<\/p>\n<h3>0. \u5f00\u7bc7&#xff1a;\u8fd9\u7bc7\u6587\u7ae0\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898&#xff1f;<\/h3>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u53ea\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898&#xff1a;<\/p>\n<p>\u5728\u771f\u5b9e\u5de5\u7a0b\u91cc&#xff0c;\u5982\u4f55\u7528\u4e00\u6761\u201c\u5b89\u5168\u3001\u53ef\u63a7\u3001\u53ef\u590d\u7528\u201d\u7684 SELECT&#xff0c;\u628a\u6570\u636e\u6b63\u786e\u5730\u62ff\u51fa\u6765\u3002<\/p>\n<p>\u5f88\u591a\u4eba\u5b66\u8fc7 SQL&#xff0c;\u4f46\u4e00\u5199\u67e5\u8be2\u5c31\u4f1a\u51fa\u73b0\u8fd9\u4e9b\u60c5\u51b5&#xff1a;<\/p>\n<ul>\n<li>SELECT * \u76f4\u63a5\u5168\u8868\u8fd4\u56de<\/li>\n<li>\u4e0d\u77e5\u9053\u54ea\u4e9b\u5b57\u6bb5\u662f\u201c\u5bf9\u5916\u63a5\u53e3\u5b57\u6bb5\u201d<\/li>\n<li>\u628a DISTINCT \u5f53\u6210\u201c\u6309\u67d0\u4e00\u5217\u53bb\u91cd\u6574\u884c\u201d<\/li>\n<li>\u7528 &#061; NULL \u5224\u65ad\u7a7a\u503c<\/li>\n<li>AS \u53ea\u5f53\u6210\u201c\u6539\u4e2a\u597d\u770b\u540d\u5b57\u201d<\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u5728\u8bfe\u4ef6\u91cc\u80fd\u8dd1\u901a&#xff0c;\u4f46\u5728 \u4e1a\u52a1\u7cfb\u7edf \/ Agent \/ \u5de5\u4f5c\u6d41 \u91cc&#xff0c;\u90fd\u662f\u9690\u60a3\u3002<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u6309\u8bfe\u5802 6.2.1 \u7684\u987a\u5e8f&#xff0c;\u4e00\u6761\u4e00\u6761\u8bb2\u6e05\u695a\u3002<\/p>\n<hr \/>\n<h3>1. \u67e5\u8be2\u6240\u6709&#xff1a;SELECT * \u7684\u6b63\u786e\u59ff\u52bf&#xff08;\u53ea\u7528\u4e8e\u8c03\u8bd5&#xff09;<\/h3>\n<p>\u6700\u57fa\u7840\u7684\u67e5\u8be2&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> student<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5b83\u7684\u771f\u5b9e\u542b\u4e49\u662f&#xff1a;<\/p>\n<p>\u4ece student \u8868\u4e2d&#xff0c;\u628a\u6bcf\u4e00\u884c\u3001\u6bcf\u4e00\u5217&#xff0c;\u539f\u6837\u8fd4\u56de\u3002<\/p>\n<h4>\u5de5\u7a0b\u89c6\u89d2<\/h4>\n<ul>\n<li>SELECT * \u4e0d\u662f\u201c\u89c4\u8303\u5199\u6cd5\u201d<\/li>\n<li>\u5b83\u53ea\u9002\u5408\u8c03\u8bd5\u9636\u6bb5&#xff08;\u770b\u8868\u7ed3\u6784\u3001\u770b\u6570\u636e\u6837\u5b50&#xff09;<\/li>\n<\/ul>\n<h4>\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u5728\u6b63\u5f0f\u67e5\u8be2\u91cc\u7528&#xff1f;<\/h4>\n<p>\u5de5\u7a0b\u63d0\u793a&#xff1a;<\/p>\n<ul>\n<li>\u5b57\u6bb5\u4e00\u65e6\u65b0\u589e&#xff0c;\u8fd4\u56de\u7ed3\u6784\u5c31\u53d8\u4e86<\/li>\n<li>Agent \/ \u540e\u7aef \/ \u524d\u7aef\u5bb9\u6613\u88ab\u201c\u591a\u4f59\u5b57\u6bb5\u201d\u5e72\u6270<\/li>\n<li>\u6027\u80fd\u4e0d\u53ef\u63a7&#xff08;\u4f60\u4e0d\u77e5\u9053\u8fd4\u56de\u4e86\u591a\u5c11\u6570\u636e&#xff09;<\/li>\n<\/ul>\n<h4>\u6b63\u786e\u505a\u6cd5<\/h4>\n<p><span class=\"token keyword\">SELECT<\/span> id<span class=\"token punctuation\">,<\/span> name<span class=\"token punctuation\">,<\/span> age<br \/>\n<span class=\"token keyword\">FROM<\/span> student<span class=\"token punctuation\">;<\/span><\/p>\n<p>SELECT \u672c\u8d28\u662f\u5728\u201c\u5b9a\u4e49\u8fd4\u56de\u7ed3\u6784\u201d&#xff0c;\u800c\u4e0d\u662f\u201c\u968f\u4fbf\u67e5\u201d\u3002<\/p>\n<hr \/>\n<h3>2. \u67e5\u8be2\u90e8\u5206\u5217&#xff1a;\u628a SQL \u5f53\u201c\u63a5\u53e3\u8fd4\u56de\u5b57\u6bb5\u5b9a\u4e49\u201d<\/h3>\n<p>\u5f53\u4f60\u660e\u786e\u5199\u51fa\u5217\u540d\u65f6&#xff0c;\u4f60\u505a\u7684\u4e8b\u60c5\u5176\u5b9e\u662f&#xff1a;<\/p>\n<p>\u5728 SQL \u5c42&#xff0c;\u5b9a\u4e49\u4e86\u4e00\u6b21\u201c\u6570\u636e\u63a5\u53e3\u8fd4\u56de\u683c\u5f0f\u201d\u3002<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> name<span class=\"token punctuation\">,<\/span> age<br \/>\n<span class=\"token keyword\">FROM<\/span> student<span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u5de5\u7a0b\u89c6\u89d2<\/h4>\n<ul>\n<li>SQL \u672c\u8eab\u5c31\u53ef\u4ee5\u5b8c\u6210 \u5b57\u6bb5\u88c1\u526a<\/li>\n<li>\u4e0b\u6e38&#xff08;Python \/ Java \/ Agent&#xff09;\u4e0d\u9700\u8981\u518d pick \u4e00\u6b21<\/li>\n<\/ul>\n<p>\u5de5\u7a0b\u63d0\u793a&#xff1a;<\/p>\n<ul>\n<li>\u8fd4\u56de\u5b57\u6bb5\u8d8a\u7a33\u5b9a&#xff0c;\u7cfb\u7edf\u8d8a\u7a33<\/li>\n<li>\u6570\u636e\u201c\u5728\u54ea\u4e00\u5c42\u88ab\u88c1\u526a\u201d&#xff0c;\u975e\u5e38\u91cd\u8981<\/li>\n<\/ul>\n<h4>\u5e38\u89c1\u5751<\/h4>\n<ul>\n<li>\u274c \u5168\u8868\u67e5\u51fa\u6765\u518d\u5728\u4ee3\u7801\u91cc\u5220\u5b57\u6bb5<\/li>\n<li>\u274c Agent \u62ff\u5230\u4e00\u5806\u65e0\u5173\u5b57\u6bb5&#xff0c;\u7406\u89e3\u6210\u672c\u98d9\u5347<\/li>\n<\/ul>\n<hr \/>\n<h3>3. \u53bb\u91cd&#xff1a;DISTINCT \u662f\u201c\u679a\u4e3e\u7ef4\u5ea6\u503c\u201d\u7684\u5de5\u5177<\/h3>\n<p>\u6700\u5e38\u89c1\u7684\u7528\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token keyword\">DISTINCT<\/span> city<br \/>\n<span class=\"token keyword\">FROM<\/span> student<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u542b\u4e49\u975e\u5e38\u660e\u786e&#xff1a;<\/p>\n<p>\u6211\u5173\u5fc3\u7684\u662f&#xff1a;\u6709\u54ea\u4e9b\u57ce\u5e02&#xff0c;\u800c\u4e0d\u662f\u6709\u591a\u5c11\u5b66\u751f\u3002<\/p>\n<h4>\u5e38\u89c1\u8bef\u89e3&#xff08;\u4e00\u5b9a\u8981\u6f84\u6e05&#xff09;<\/h4>\n<p>\u274c \u9519\u8bef\u7406\u89e3&#xff1a;<\/p>\n<p>\u201c\u6309 city \u53bb\u91cd\u6574\u884c\u201d<\/p>\n<p>\u2705 \u6b63\u786e\u7406\u89e3&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token keyword\">DISTINCT<\/span> city<span class=\"token punctuation\">,<\/span> class_id<br \/>\n<span class=\"token keyword\">FROM<\/span> student<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u662f\u5728\u5bf9 (city, class_id) \u8fd9\u4e2a\u7ec4\u5408\u53bb\u91cd\u3002<\/p>\n<h4>\u5de5\u7a0b\u89c6\u89d2<\/h4>\n<p>DISTINCT \u6700\u9002\u5408\u505a\u7684\u4e8b&#xff1a;<\/p>\n<ul>\n<li>\u679a\u4e3e\u72b6\u6001\u503c<\/li>\n<li>\u679a\u4e3e\u5206\u7c7b\u7ef4\u5ea6<\/li>\n<li>\u7ed9\u524d\u7aef \/ Agent \u63d0\u4f9b\u201c\u53ef\u9009\u9879\u5217\u8868\u201d<\/li>\n<\/ul>\n<p>\u5de5\u7a0b\u63d0\u793a&#xff1a;<\/p>\n<p>DISTINCT &#061; \u679a\u4e3e\u7ef4\u5ea6\u503c&#xff0c;\u800c\u4e0d\u662f\u6e05\u6d17\u810f\u6570\u636e\u3002<\/p>\n<hr \/>\n<h3>4. \u56db\u5219\u8fd0\u7b97&#xff1a;SQL \u91cc\u5148\u7b97\u4e00\u6b65&#xff0c;\u5c11\u5199\u4e00\u5c42\u4ee3\u7801<\/h3>\n<p>SQL \u4e0d\u53ea\u662f\u201c\u67e5\u6570\u636e\u201d&#xff0c;\u5b83\u53ef\u4ee5\u76f4\u63a5\u505a\u8ba1\u7b97\u3002<\/p>\n<p><span class=\"token keyword\">SELECT<\/span><br \/>\n  order_id<span class=\"token punctuation\">,<\/span><br \/>\n  price <span class=\"token operator\">*<\/span> quantity <span class=\"token keyword\">AS<\/span> total_amount<br \/>\n<span class=\"token keyword\">FROM<\/span> orders<span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u5de5\u7a0b\u89c6\u89d2<\/h4>\n<ul>\n<li>\u80fd\u5728 SQL \u7b97\u7684&#xff0c;\u5c31\u522b\u7559\u5230\u4ee3\u7801\u5c42<\/li>\n<li>\u5c11\u4e00\u5c42\u8ba1\u7b97&#xff0c;\u5c31\u5c11\u4e00\u5c42\u51fa\u9519\u70b9<\/li>\n<\/ul>\n<h4>\u5178\u578b\u4e1a\u52a1\u573a\u666f<\/h4>\n<ul>\n<li>\u8ba2\u5355\u603b\u4ef7<\/li>\n<li>\u5206\u6570\u52a0\u6743<\/li>\n<li>\u4f59\u989d\u8ba1\u7b97<\/li>\n<\/ul>\n<p>\u5de5\u7a0b\u63d0\u793a&#xff1a;<\/p>\n<p>SQL \u91cc\u7684\u8ba1\u7b97 &#061; \u6570\u636e\u5c42\u7684\u201c\u9884\u5904\u7406\u201d\u3002<\/p>\n<hr \/>\n<h3>5. \u7a7a\u503c\u5904\u7406&#xff1a;NULL \u4e0d\u662f 0&#xff0c;\u4e5f\u4e0d\u662f\u7a7a\u5b57\u7b26\u4e32<\/h3>\n<p>\u8fd9\u662f\u6700\u5bb9\u6613\u5199\u9519\u3001\u4e5f\u6700\u5371\u9669\u7684\u4e00\u70b9\u3002<\/p>\n<h4>\u9519\u8bef\u5199\u6cd5&#xff08;\u975e\u5e38\u5e38\u89c1&#xff09;<\/h4>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span><br \/>\n<span class=\"token keyword\">FROM<\/span> employee<br \/>\n<span class=\"token keyword\">WHERE<\/span> bonus <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u6b63\u786e\u5199\u6cd5<\/h4>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span><br \/>\n<span class=\"token keyword\">FROM<\/span> employee<br \/>\n<span class=\"token keyword\">WHERE<\/span> bonus <span class=\"token operator\">IS<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6216\u8005&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span><br \/>\n<span class=\"token keyword\">FROM<\/span> employee<br \/>\n<span class=\"token keyword\">WHERE<\/span> bonus <span class=\"token operator\">IS<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u5de5\u7a0b\u89c6\u89d2<\/h4>\n<ul>\n<li>NULL \u8868\u793a&#xff1a;\u672a\u77e5 \/ \u4e0d\u5b58\u5728<\/li>\n<li>\u5b83\u4e0d\u7b49\u4e8e\u4efb\u4f55\u503c&#xff0c;\u5305\u62ec\u5b83\u81ea\u5df1<\/li>\n<\/ul>\n<p>\u5e38\u89c1\u5751&#xff1a;<\/p>\n<ul>\n<li>\u274c &#061; NULL<\/li>\n<li>\u274c !&#061; NULL<\/li>\n<\/ul>\n<p>\u5de5\u7a0b\u63d0\u793a&#xff1a;<\/p>\n<p>\u5224\u65ad NULL&#xff0c;\u53ea\u80fd\u7528 IS \/ IS NOT\u3002<\/p>\n<hr \/>\n<h3>6. \u522b\u540d&#xff1a;AS \u4e0d\u662f\u7f8e\u5316&#xff0c;\u662f\u201c\u5bf9\u5916\u8bed\u4e49\u201d<\/h3>\n<p>\u5f88\u591a\u4eba\u4ee5\u4e3a AS \u53ea\u662f\u6539\u4e2a\u540d\u5b57&#xff0c;\u5176\u5b9e\u4e0d\u662f\u3002<\/p>\n<p><span class=\"token keyword\">SELECT<\/span><br \/>\n  name <span class=\"token keyword\">AS<\/span> \u59d3\u540d<span class=\"token punctuation\">,<\/span><br \/>\n  age  <span class=\"token keyword\">AS<\/span> \u5e74\u9f84<br \/>\n<span class=\"token keyword\">FROM<\/span> student<span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u5de5\u7a0b\u89c6\u89d2<\/h4>\n<ul>\n<li>\u6570\u636e\u5e93\u5b57\u6bb5\u540d \u2260 \u5bf9\u5916\u8bed\u4e49<\/li>\n<li>SQL \u672c\u8eab\u5c31\u53ef\u4ee5\u5b8c\u6210\u201c\u8bed\u4e49\u6620\u5c04\u201d<\/li>\n<\/ul>\n<h4>\u4e3a\u4ec0\u4e48\u8fd9\u5728\u5de5\u7a0b\u91cc\u5f88\u91cd\u8981&#xff1f;<\/h4>\n<ul>\n<li>\u8fd4\u56de\u7ed3\u679c\u53ef\u76f4\u63a5\u7ed9\u524d\u7aef<\/li>\n<li>\u53ef\u76f4\u63a5\u7ed9 Agent \u4f5c\u4e3a\u4e0a\u4e0b\u6587<\/li>\n<li>\u5c11\u4e00\u5c42\u5b57\u6bb5\u7ffb\u8bd1\u903b\u8f91<\/li>\n<\/ul>\n<h4>\u8868\u522b\u540d&#xff08;\u63d0\u524d\u517b\u6210\u4e60\u60ef&#xff09;<\/h4>\n<p><span class=\"token keyword\">SELECT<\/span> s<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>age<br \/>\n<span class=\"token keyword\">FROM<\/span> student <span class=\"token keyword\">AS<\/span> s<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5de5\u7a0b\u63d0\u793a&#xff1a;<\/p>\n<p>\u8868\u522b\u540d\u4e0d\u662f\u7b80\u5199&#xff0c;\u662f\u4e3a\u4e86\u7ed3\u6784\u6e05\u6670\u548c\u53ef\u7ef4\u62a4\u3002<\/p>\n<hr \/>\n<h3>7. \u672c\u7bc7\u5c0f\u7ed3&#xff1a;\u628a 6.2.1 \u538b\u6210\u4e00\u4e2a\u201c\u67e5\u8be2\u6a21\u677f\u201d<\/h3>\n<h4>\u5b89\u5168\u67e5\u8be2\u6a21\u677f&#xff08;\u5de5\u7a0b\u63a8\u8350&#xff09;<\/h4>\n<p><span class=\"token keyword\">SELECT<\/span><br \/>\n  s<span class=\"token punctuation\">.<\/span>id        <span class=\"token keyword\">AS<\/span> student_id<span class=\"token punctuation\">,<\/span><br \/>\n  s<span class=\"token punctuation\">.<\/span>name      <span class=\"token keyword\">AS<\/span> student_name<span class=\"token punctuation\">,<\/span><br \/>\n  s<span class=\"token punctuation\">.<\/span>age<span class=\"token punctuation\">,<\/span><br \/>\n  s<span class=\"token punctuation\">.<\/span>city<br \/>\n<span class=\"token keyword\">FROM<\/span> student <span class=\"token keyword\">AS<\/span> s<br \/>\n<span class=\"token keyword\">WHERE<\/span> s<span class=\"token punctuation\">.<\/span>city <span class=\"token operator\">IS<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><br \/>\n<span class=\"token keyword\">LIMIT<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u4e00\u53e5\u8bdd\u603b\u7ed3<\/h4>\n<p>SELECT \u51b3\u5b9a\u4f60\u201c\u8fd4\u56de\u4ec0\u4e48\u7ed3\u6784\u201d&#xff0c; FROM \u51b3\u5b9a\u4f60\u201c\u6570\u636e\u6765\u81ea\u54ea\u91cc\u201d&#xff0c; AS \u51b3\u5b9a\u4f60\u201c\u5bf9\u5916\u600e\u4e48\u7406\u89e3\u201d&#xff0c; DISTINCT \u51b3\u5b9a\u4f60\u201c\u8981\u4e0d\u8981\u91cd\u590d\u201d&#xff0c; LIMIT 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