{"id":36067,"date":"2025-05-07T15:51:59","date_gmt":"2025-05-07T07:51:59","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/36067.html"},"modified":"2025-05-07T15:51:59","modified_gmt":"2025-05-07T07:51:59","slug":"%e5%a4%b1%e8%b4%a5%e7%9a%84%e9%9d%a2%e8%af%95%e7%bb%8f%e5%8e%86%ca%98%cc%a5%e2%88%a7%ca%98%cc%a5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/36067.html","title":{"rendered":"\u5931\u8d25\u7684\u9762\u8bd5\u7ecf\u5386(\u0298\u0325\u2227\u0298\u0325)"},"content":{"rendered":"<h2>\u4e00.\u9762\u5411\u5bf9\u8c61\u7684\u4e09\u5927\u7279\u6027<\/h2>\n<p>1.\u5c01\u88c5&#xff1a;\u5c06\u5bf9\u8c61\u5185\u90e8\u7684\u5c5e\u6027\u79c1\u6709\u5316&#xff0c;\u5916\u90e8\u5bf9\u8c61\u4e0d\u80fd\u591f\u76f4\u63a5\u8bbf\u95ee&#xff0c;\u4f46\u662f\u53ef\u4ee5\u63d0\u4f9b\u4e00\u4e9b\u53ef\u4ee5\u4f7f\u5916\u90e8\u5bf9\u8c61\u64cd\u4f5c\u5185\u90e8\u5c5e\u6027\u7684\u65b9\u6cd5\u3002<\/p>\n<p>2.\u7ee7\u627f&#xff1a;\u7c7b\u4e0e\u7c7b\u4e4b\u95f4\u4f1a\u6709\u4e00\u4e9b\u76f8\u4f3c\u4e4b\u5904&#xff0c;\u4f46\u4e5f\u4f1a\u6709\u4e00\u4e9b\u5f02\u5904&#xff0c;\u4f7f\u5f97\u4ed6\u4eec\u4e0e\u4f17\u4e0d\u540c&#xff0c;\u7ee7\u627f\u5c31\u662f\u5728\u7236\u7c7b\u7684\u57fa\u7840\u4e0a&#xff0c;\u521b\u5efa\u4e00\u4e2a\u4e0e\u7236\u7c7b\u6709\u76f8\u540c\u4e4b\u5904&#xff0c;\u4f46\u662f\u4e5f\u53ef\u4ee5\u58f0\u660e\u81ea\u5df1\u72ec\u6709\u7684\u65b9\u6cd5\u4e0e\u5c5e\u6027\u7684\u5bf9\u8c61&#xff0c;\u8fd9\u6837\u505a\u53ef\u4ee5\u589e\u52a0\u4ee3\u7801\u7684\u590d\u7528&#xff0c;\u4f7f\u5f97\u7ef4\u62a4\u6216\u6269\u5c55\u66f4\u52a0\u7684\u65b9\u4fbf&#xff0c;\u7075\u6d3b\u3002<\/p>\n<p>3.\u591a\u6001&#xff1a;\u4e00\u4e2a\u5bf9\u8c61\u6709\u591a\u79cd\u72b6\u6001&#xff0c;\u8fd9\u6d89\u53ca\u5230\u4e86\u5411\u4e0a\u6216\u5411\u4e0b\u8f6c\u578b\u3002 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thread;<\/p>\n<p>public class ThreadTest extends Thread{<br \/>\n    String name;<br \/>\n    ThreadTest(String name){<br \/>\n        this.name&#061;name;<br \/>\n    }<\/p>\n<p>    &#064;Override<br \/>\n    public void run() {<br \/>\n        System.out.println(&#034;this is a thread&#034;);<br \/>\n    }<br \/>\n}<br \/>\nclass StartTest{<br \/>\n    public static void main(String[] args) {<br \/>\n        ThreadTest test&#061;new ThreadTest(&#034;thread&#034;);<br \/>\n        test.start();<br \/>\n    }<br \/>\n}<\/p>\n<p>2.\u5b9e\u73b0Runnable\u63a5\u53e3\u914d\u5408Thread<\/p>\n<ul>\n<li>\u5b9a\u4e49Runnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b&#xff0c;\u5e76\u91cd\u5199run()\u65b9\u6cd5&#xff0c;run()\u65b9\u6cd5\u4e2d\u7684\u4ee3\u7801\u5c31\u662f\u7ebf\u7a0b\u6240\u8981\u6267\u884c\u7684\u4efb\u52a1&#xff0c;\u6240\u4ee5run()\u65b9\u6cd5\u88ab\u79f0\u4e3a\u6267\u884c\u4f53(\u7ebf\u7a0b\u4f53)<\/li>\n<li>\u521b\u5efaRunnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u7684\u5bf9\u8c61&#xff0c;\u4f7f\u6b64\u5bf9\u8c61\u4f5c\u4e3aThread\u7684target\u6765\u521b\u5efaThread\u5bf9\u8c61&#xff0c;\u8fd9\u4e2a\u5bf9\u8c61\u624d\u662f\u771f\u6b63\u7684\u7ebf\u7a0b\u5bf9\u8c61<\/li>\n<li>\u8c03\u7528\u7ebf\u7a0b\u5bf9\u8c61\u7684start()\u65b9\u6cd5\u6765\u542f\u52a8\u7ebf\u7a0b<\/li>\n<li>Runnable\u63a5\u53e3\u652f\u6301\u591a\u7ee7\u627f<\/li>\n<\/ul>\n<p>package thread;<\/p>\n<p>public class RunnableTest implements Runnable{<br \/>\n    String name;<br \/>\n    RunnableTest(String name){<br \/>\n        this.name&#061;name;<br \/>\n    }<\/p>\n<p>    &#064;Override<br \/>\n    public void run() {<br \/>\n        System.out.println(&#034;this is a thread&#034;);<br \/>\n    }<br \/>\n}<br \/>\nclass RunnableStartTest{<br \/>\n    public static void main(String[] args) {<br \/>\n        RunnableTest test&#061;new RunnableTest(&#034;thread&#034;);<br \/>\n        Thread thread&#061;new Thread(test);<br \/>\n        thread.start();<br \/>\n    }<br \/>\n} <\/p>\n<p>3.\u901a\u8fc7Callable\u548cFutureTask\u521b\u5efa\u7ebf\u7a0b<\/p>\n<ul>\n<li>\u521b\u5efaCallable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b&#xff0c;\u5e76\u91cd\u5199call()\u65b9\u6cd5&#xff0c;call\u65b9\u6cd5\u662f\u7ebf\u7a0b\u7684\u6267\u884c\u4f53<\/li>\n<li>\u521b\u5efaCallable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u7684\u5b9e\u4f8b&#xff0c;\u7136\u540e\u521b\u5efa\u5305\u88c5\u4e86Callable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u5b9e\u4f8b\u7684FutureTask\u7c7b\u7684\u5b9e\u4f8b\u5bf9\u8c61&#xff0c;FutureTask\u5bf9\u8c61\u5c01\u88c5\u4e86\u5b9e\u73b0\u7c7b\u4e2d\u7684call()\u65b9\u6cd5\u7684\u8fd4\u56de\u503c(FutureTask\u662f\u4e00\u4e2a\u5305\u88c5\u5668&#xff0c;\u5b83\u901a\u8fc7\u5305\u88c5Callable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u6765\u5b9e\u73b0&#xff0c;\u5b83\u540c\u65f6\u5b9e\u73b0\u4e86Future\u548cRunnable\u4e24\u4e2a\u63a5\u53e3)<\/li>\n<li>\u4f7f\u7528FutureTask\u5bf9\u8c61\u4f5c\u4e3aThread\u7684target\u6765\u521b\u5efa\u5b9e\u4f8b&#xff0c;\u6b64\u5b9e\u4f8b\u5bf9\u8c61\u4e3a\u7ebf\u7a0b\u7684\u5bf9\u8c61<\/li>\n<li>\u8c03\u7528\u7ebf\u7a0b\u5bf9\u8c61\u7684start()\u65b9\u6cd5\u6765\u542f\u52a8\u7ebf\u7a0b<\/li>\n<li>\u8c03\u7528FutureTask\u5bf9\u8c61\u7684get()\u65b9\u6cd5\u6765\u83b7\u53d6\u5b50\u7ebf\u7a0b\u7ed3\u675f\u7684\u8fd4\u56de\u503c<\/li>\n<\/ul>\n<p>package thread;<\/p>\n<p>import java.util.concurrent.Callable;<br \/>\nimport java.util.concurrent.FutureTask;<\/p>\n<p>public class CallableAndFutureTaskTest implements Callable {<br \/>\n    String name;<br \/>\n    CallableAndFutureTaskTest(String name){<br \/>\n        this.name&#061;name;<br \/>\n    }<\/p>\n<p>    &#064;Override<br \/>\n    public Object call() throws Exception {<br \/>\n        System.out.println(&#034;this is a thread&#034;);<br \/>\n        return null;<br \/>\n    }<br \/>\n}<br \/>\nclass CallableAndFutureTaskStartTest{<br \/>\n    public static void main(String[] args) throws Exception{<br \/>\n        CallableAndFutureTaskTest test&#061;new CallableAndFutureTaskTest(&#034;thread&#034;);<br \/>\n        FutureTask futureTask&#061;new FutureTask(test);<br \/>\n        Thread thread&#061;new Thread(futureTask);<br \/>\n        thread.start();<br \/>\n        String result&#061;(String) futureTask.get();<br \/>\n        System.out.println(result);<br \/>\n    }<br \/>\n}<\/p>\n<h2>\u4e09.\u4e8b\u52a1\u7684\u56db\u5927\u7279\u6027(ACID)<\/h2>\n<p>1.\u539f\u5b50\u6027&#xff1a;\u4e8b\u52a1\u662f\u6700\u5c0f\u7684\u6267\u884c\u5355\u4f4d&#xff0c;\u786e\u4fdd\u4e86\u52a8\u4f5c\u8981\u4e48\u5b8c\u5168\u5b8c\u6210&#xff0c;\u8981\u4e48\u5c31\u662f\u5b8c\u5168\u4e0d\u8d77\u4f5c\u7528 2.\u4e00\u81f4\u6027&#xff1a;\u5904\u7406\u7684\u6570\u636e\u662f\u4e00\u81f4\u7684&#xff0c;\u4f8b\u5982\u8f6c\u8d26\u8005\u548c\u6536\u6b3e\u8005\u7684\u603b\u91d1\u989d\u662f\u4e0d\u53d8\u7684 3.\u9694\u79bb\u6027&#xff1a;\u53d1\u751f\u5e76\u53d1\u8bbf\u95ee\u6570\u636e\u5e93\u65f6&#xff0c;\u4e00\u4e2a\u4e8b\u7269\u4e0d\u4f1a\u88ab\u53e6\u4e00\u4e2a\u4e8b\u7269\u6240\u5f71\u54cd 4.\u6301\u4e45\u6027&#xff1a;\u4e00\u4e2a\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u540e&#xff0c;\u4ed6\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u5f71\u54cd\u662f\u6301\u4e45\u7684&#xff0c;\u5373\u4f7f\u51fa\u73b0\u4e86\u6570\u636e\u5e93\u969c\u788d\u4e5f\u4e0d\u4f1a\u5f71\u54cd\u3002<\/p>\n<h2>\u56db.Get()\u65b9\u6cd5\u4e0ePost()\u65b9\u6cd5\u7684\u533a\u522b<\/h2>\n<p>Get()\u65b9\u6cd5\u548cPost()\u65b9\u6cd5\u662fHttp\u534f\u8bae\u4e2d\u4e24\u79cd\u5e38\u7528\u7684\u8bf7\u6c42\u65b9\u6cd5&#xff0c;\u4f46\u662f\u5728\u4e0d\u540c\u7684\u573a\u666f\u548c\u76ee\u7684\u4e0b\u7684\u4f7f\u7528\u662f\u4e0d\u540c\u7684\u3002<\/p>\n<p>1.\u5728\u8bed\u4e49\u4e0a&#xff1a;Get()\u65b9\u6cd5\u7528\u4e8e\u83b7\u53d6\u548c\u67e5\u8be2\u8d44\u6e90&#xff0c;\u800cPost()\u65b9\u6cd5\u66f4\u52a0\u504f\u5411\u4e8e\u4fee\u6539\u6216\u521b\u5efa\u3002\u8fd9\u5c31\u610f\u5473\u7740Get\u8bf7\u6c42\u62e5\u6709\u7b49\u5e42\u6027\u3002\u800cPost()\u65b9\u6cd5\u53ef\u80fd\u4f1a\u6709\u526f\u4f5c\u7528&#xff0c;\u5373\u6bcf\u6b21\u6267\u884c\u90fd\u53ef\u80fd\u4ea7\u751f\u4e0d\u540c\u7684\u7ed3\u679c&#xff0c;\u5f71\u54cd\u8d44\u6e90\u7684\u72b6\u6001\u3002<\/p>\n<p>2.\u5728\u7ed3\u6784\u4e0a&#xff1a;Get()\u65b9\u6cd5\u7684\u8bf7\u6c42\u7684\u53c2\u6570\u4f20\u9012\u4f1a\u663e\u793a\u5230url\u4e0a&#xff0c;\u5f62\u6210\u67e5\u8be2\u5b57\u7b26\u4e32(querystring)&#xff0c;\u800cPost()\u65b9\u6cd5\u7684\u53c2\u6570\u5728\u6267\u884c\u4f53(body)\u4e2d&#xff0c;Get\u8bf7\u6c42\u7684\u67e5\u8be2\u5b57\u7b26\u4e32\u957f\u5ea6\u4f1a\u53d7\u5230url\u7684\u9650\u5236&#xff0c;\u800cPost\u8bf7\u6c42\u5219\u4e0d\u4f1a\u6709\u660e\u786e\u7684\u9650\u5236\u3002<\/p>\n<p>3.\u5728\u7f13\u5b58\u4e0a&#xff1a;\u7531\u4e8eGet\u8bf7\u6c42\u662f\u7b49\u5e42\u7684&#xff0c;\u6240\u4ee5\u5bf9\u4e8eGet\u8bf7\u6c42\u6765\u8bf4&#xff0c;\u5728\u6d4f\u89c8\u5668\u4e2d\u4f1a\u6709\u7f13\u5b58\u6765\u4fdd\u5b58\u6570\u636e&#xff0c;\u8fd9\u6837\u53ef\u4ee5\u63d0\u9ad8Get()\u65b9\u6cd5\u7684\u83b7\u53d6\u6216\u67e5\u8be2\u7684\u6548\u7387&#xff1b;\u800cPost\u8bf7\u6c42\u53ef\u80fd\u4f1a\u6709\u526f\u4f5c\u7528&#xff0c;\u6240\u4ee5\u5e76\u6ca1\u6709\u7f13\u5b58\u673a\u5236\u3002<\/p>\n<p>4.\u5728\u5b89\u5168\u6027\u4e0a&#xff1a;\u672c\u8d28\u4e0aGet\u8bf7\u6c42\u548cPost\u8bf7\u6c42\u90fd\u4e0d\u662f\u7edd\u5bf9\u5b89\u5168\u7684&#xff0c;\u56e0\u4e3aHttp\u534f\u8bae\u90fd\u662f\u660e\u6587\u4f20\u8f93&#xff0c;\u65e0\u8bba\u662furl,header\u6216\u8005\u662fbody\u90fd\u6709\u53ef\u80fd\u88ab\u7a83\u53d6&#xff0c;\u6240\u4ee5\u5e94\u8be5\u4f7f\u7528Http\u534f\u8bae\u52a0\u5bc6\u4f20\u8f93\u6570\u636e\u3002\u4f46\u662f\u5728\u4e00\u4e9b\u5e94\u7528\u573a\u666f\u4e0b&#xff0c;Get\u65b9\u6cd5\u8981\u6bd4Post\u65b9\u6cd5\u66f4\u52a0\u4e0d\u5b89\u5168&#xff0c;\u56e0\u4e3aGet\u65b9\u6cd5\u7684\u53c2\u6570\u4f20\u9012\u4f1a\u5728url\u4e0a\u663e\u793a\u51fa\u6765&#xff0c;\u5728\u4e00\u4e9b\u4ee3\u7406\u65e5\u5fd7\u4e0a\u6216\u8005\u6d4f\u89c8\u5668\u7684\u5386\u53f2\u4e0a\u53ef\u4ee5\u88ab\u627e\u5230&#xff0c;\u6240\u4ee5\u5728\u4f20\u8f93\u4e00\u4e9b\u79c1\u5bc6\u6570\u636e\u7684\u65f6\u5019\u5e94\u8be5\u4f7f\u7528Post\u65b9\u6cd5\u8fdb\u884c\u4f20\u9012\u3002<\/p>\n<h2>\u4e94&#xff0c;\u6570\u636e\u5e93(MySQL)\u7684\u5de6&#xff0c;\u53f3\u8fde\u63a5\u4ee5\u53ca\u5185\u8fde\u63a5<\/h2>\n<p>1.Left join&#8230;on:\u5de6\u8fde\u63a5&#xff0c;\u4ee5\u5de6\u8868\u4e3a\u57fa\u7840&#xff0c;\u67e5\u8be2\u5de6\u8868\u7684\u6240\u6709\u6570\u636e\u4ee5\u53ca\u6ee1\u8db3on\u5173\u952e\u5b57\u540e\u9762\u7684\u6761\u4ef6\u7684\u53f3\u8868\u6570\u636e&#xff0c;\u5de6\u8fde\u63a5\u53c8\u79f0\u5de6\u5916\u8fde\u63a5&#xff0c;\u662f\u5916\u8fde\u63a5\u7684\u4e00\u79cd\u3002 2.Right join&#8230;on:\u53f3\u8fde\u63a5&#xff0c;\u4ee5\u53f3\u8868\u4e3a\u57fa\u7840&#xff0c;\u67e5\u8be2\u53f3\u8868\u7684\u6240\u6709\u6570\u636e\u4ee5\u53ca\u6ee1\u8db3on\u5173\u952e\u5b57\u540e\u9762\u7684\u6761\u4ef6\u7684\u5de6\u8868\u6570\u636e&#xff0c;\u53f3\u8fde\u63a5\u53c8\u79f0\u4e3a\u53f3\u5916\u8fde\u63a5&#xff0c;\u662f\u5916\u8fde\u63a5\u7684\u4e00\u79cd\u3002 3.Inner join&#8230;on:\u5185\u8fde\u63a5&#xff0c;\u4ee5\u5de6\u53f3\u4e24\u8868\u4e3a\u53c2\u8003\u5bf9\u8c61&#xff0c;\u67e5\u8be2\u5de6\u53f3\u4e24\u8868\u540c\u65f6\u6ee1\u8db3on\u5173\u952e\u5b57\u540e\u9762\u7684\u6761\u4ef6\u7684\u6570\u636e\u3002<\/p>\n<p>MySQL\u4e2d\u6ca1\u6709\u5168\u5916\u8fde\u63a5&#xff0c;\u6240\u4ee5\u5c31\u4e0d\u89e3\u91ca\u4e86\u3002<\/p>\n<p>\u9996\u5148\u521b\u5efa\u4e86\u4e24\u4e2a\u8868table_left\u548ctable_right.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"184\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e18b6f.png\" width=\"174\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"159\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e236ad.png\" width=\"189\" \/><\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<\/p>\n<p>\u5de6\u8fde\u63a5&#xff1a;<\/p>\n<p>SELECT * FROM table_left LEFT JOIN table_right ON table_left.id&#061;table_right.id <\/p>\n<p>\u7ed3\u679c&#xff1a;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"186\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e2bd26.png\" width=\"353\" \/><\/p>\n<p>\u53f3\u8fde\u63a5&#xff1a;<\/p>\n<p>SELECT * FROM table_left RIGHT JOIN table_right ON table_left.id&#061;table_right.id <\/p>\n<p>\u7ed3\u679c&#xff1a;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"155\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e3890f.png\" width=\"313\" \/><\/p>\n<p>\u5185\u8fde\u63a5&#xff1a;<\/p>\n<p>SELECT * FROM table_left INNER JOIN table_right ON table_left.id&#061;table_right.id <\/p>\n<p>\u7ed3\u679c&#xff1a;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"157\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e446ce.png\" width=\"315\" \/><\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;\u603b\u7ed3\u4e00\u4e0b&#xff0c;\u8fd9\u5c31\u76f8\u5f53\u4e8e\u4e00\u4e2a\u96c6\u5408A\u548cB<\/p>\n<p>A left B join:A A right B join:B A inner B join:A\u2229B<\/p>\n<p>\u5de6\u8fde\u63a5&#xff1a;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"220\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e5084b.png\" width=\"500\" \/><\/p>\n<p>\u53f3\u8fde\u63a5&#xff1a;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"206\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e60d79.png\" width=\"543\" \/><\/p>\n<p>\u5185\u8fde\u63a5&#xff1a;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"253\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e70998.png\" width=\"518\" \/><\/p>\n<p>\u5168\u8fde\u63a5&#xff1a;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"221\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e80c25.png\" width=\"490\" \/><\/p>\n<h2>\u516d.\u6570\u636e\u5e93\u5206\u8868\u67e5\u8be2\u4e2d\u4f7f\u7528\u5230\u7684in\u5173\u952e\u5b57\u53ef\u4ee5\u4f7f\u7528\u4ec0\u4e48\u4ee3\u66ff<\/h2>\n<p>\u4e00\u822c\u5728\u505aSQL\u4f18\u5316\u7684\u65f6\u5019\u8bb2\u7a76\u4f7f\u7528EXISTS\u5e26\u66ff\u4ee3IN\u7684\u505a\u6cd5&#xff0c;\u7406\u7531\u662fEXISTS\u6267\u884c\u6548\u7387\u8981\u6bd4IN\u9ad8\u3002<\/p>\n<p><img decoding=\"async\" alt=\"2d1876ca1c7bc478809ec24afc81dfe7.png\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250507075158-681b111e919ba.jpg\" 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