{"id":6685,"date":"2024-11-14T09:59:34","date_gmt":"2024-11-14T01:59:34","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6685\/"},"modified":"2024-11-14T09:59:34","modified_gmt":"2024-11-14T01:59:34","slug":"%e5%b8%b8%e8%a7%81-mysql-%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6685\/","title":{"rendered":"\u5e38\u89c1 MYSQL \u9762\u8bd5\u95ee\u9898"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/172923517490523.jpg\" class=\"aligncenter\" title=\"\u5e38\u89c1 MYSQL \u9762\u8bd5\u95ee\u9898\u63d2\u56fe\" alt=\"\u5e38\u89c1 MYSQL \u9762\u8bd5\u95ee\u9898\u63d2\u56fe\" \/><\/p>\n<h3> A. \u521d\u7ea7MySQL\u95ee\u9898\uff1a <\/h3>\n<ol>\n<li>\n<p><strong>\u4ec0\u4e48\u662f MySQL\uff1f<\/strong><\/p>\n<ul>\n<li>MySQL \u662f\u4e00\u4e2a\u5f00\u6e90\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf (RDBMS)\uff0c\u5b83\u4f7f\u7528\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00 (SQL) \u6765\u8bbf\u95ee\u3001\u7ba1\u7406\u548c\u64cd\u4f5c\u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL \u6709\u54ea\u4e9b\u4e3b\u8981\u7279\u6027\uff1f<\/strong><\/p>\n<ul>\n<li>\u5f00\u6e90\u3001\u8de8\u5e73\u53f0\u652f\u6301\u3001\u9ad8\u6027\u80fd\u3001\u652f\u6301\u590d\u6742\u67e5\u8be2\u3001\u5b89\u5168\u529f\u80fd\u3001ACID \u5408\u89c4\u6027\u3001\u53ef\u6269\u5c55\u6027\u3001\u590d\u5236\u548c\u96c6\u7fa4\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f\u5173\u7cfb\u6570\u636e\u5e93\uff1f<\/strong><\/p>\n<ul>\n<li>\u5173\u7cfb\u6570\u636e\u5e93\u662f\u4e00\u79cd\u5c06\u6570\u636e\u5b58\u50a8\u5728\u7531\u884c\u548c\u5217\u7ec4\u6210\u7684\u8868\u4e2d\u7684\u6570\u636e\u5e93\u3002\u6bcf\u4e2a\u8868\u90fd\u6709\u552f\u4e00\u7684\u952e\uff0c\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u662f\u4f7f\u7528\u5916\u952e\u5efa\u7acb\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f SQL\uff1f<\/strong><\/p>\n<ul>\n<li>SQL\uff08\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff09\u662f\u4e00\u79cd\u6807\u51c6\u7f16\u7a0b\u8bed\u8a00\uff0c\u7528\u4e8e\u7ba1\u7406\u548c\u64cd\u4f5c\u5173\u7cfb\u6570\u636e\u5e93\uff0c\u5305\u62ec\u67e5\u8be2\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u6570\u636e\u7b49\u4efb\u52a1\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL \u6709\u54ea\u4e9b\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\uff1f<\/strong><\/p>\n<ul>\n<li>MySQL\u652f\u6301\u591a\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5305\u62ec\uff1a\n<ul>\n<li> <strong>\u6570\u5b57<\/strong>\uff1aINT\u3001FLOAT\u3001DOUBLE\u3001DECIMAL <\/li>\n<li> <strong>\u5b57\u7b26\u4e32<\/strong>\uff1aVARCHAR\u3001TEXT\u3001CHAR <\/li>\n<li> <strong>\u65e5\u671f\u548c\u65f6\u95f4<\/strong>\uff1a\u65e5\u671f\u3001\u65e5\u671f\u65f6\u95f4\u3001\u65f6\u95f4\u6233\u3001\u65f6\u95f4 <\/li>\n<li> <strong>\u4e8c\u8fdb\u5236<\/strong>\uff1aBLOB\u3001\u4e8c\u8fdb\u5236 <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f\u4e3b\u952e\uff1f<\/strong><\/p>\n<ul>\n<li>\u4e3b\u952e\u662f\u8868\u8bb0\u5f55\u7684\u552f\u4e00\u6807\u8bc6\u7b26\u3002\u5b83\u786e\u4fdd\u4e3b\u952e\u5217\u4e2d\u4e0d\u5b58\u50a8\u91cd\u590d\u503c\uff0c\u5e76\u4e14\u6bcf\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f\u5916\u952e\uff1f<\/strong><\/p>\n<ul>\n<li>\u5916\u952e\u662f\u8868\u4e2d\u7684\u4e00\u4e2a\u5b57\u6bb5\uff08\u6216\u5b57\u6bb5\u96c6\u5408\uff09\uff0c\u5b83\u552f\u4e00\u6807\u8bc6\u53e6\u4e00\u4e2a\u8868\u7684\u4e00\u884c\uff0c\u5728\u4e24\u4e2a\u8868\u4e4b\u95f4\u5efa\u7acb\u94fe\u63a5\u5e76\u5f3a\u5236\u5f15\u7528\u5b8c\u6574\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>CHAR \u548c VARCHAR \u6709\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li> CHAR \u662f\u56fa\u5b9a\u957f\u5ea6\u5b57\u7b26\u4e32\uff0c\u800c VARCHAR \u662f\u53ef\u53d8\u957f\u5ea6\u5b57\u7b26\u4e32\u3002\u5f53\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u53ef\u9884\u6d4b\u65f6\u4f7f\u7528 CHAR\uff0c\u800c\u5bf9\u4e8e\u4e0d\u540c\u7684\u957f\u5ea6\uff0cVARCHAR \u66f4\u8282\u7701\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL \u4e2d\u7684 AUTO_INCRMENT \u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li> AUTO_INCRMENT \u662f MySQL \u4e2d\u7684\u4e00\u9879\u529f\u80fd\uff0c\u53ef\u4ee5\u81ea\u52a8\u4e3a\u8868\u4e2d\u7684\u65b0\u8bb0\u5f55\u751f\u6210\u552f\u4e00\u6807\u8bc6\u7b26\uff0c\u901a\u5e38\u7528\u4e8e\u4e3b\u952e\u5217\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>SQL \u4e2d\u7684 JOIN \u5b50\u53e5\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li> JOIN \u7528\u4e8e\u6839\u636e\u76f8\u5173\u5217\u7ec4\u5408\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u884c\u3002\u7c7b\u578b\u5305\u62ec INNER JOIN\u3001LEFT JOIN\u3001RIGHT JOIN \u548c FULL JOIN\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f\u5185\u8fde\u63a5\uff1f<\/strong><\/p>\n<ul>\n<li> INNER JOIN \u4ec5\u8fd4\u56de\u5728\u8fde\u63a5\u7684\u4e24\u4e2a\u8868\u4e2d\u5177\u6709\u5339\u914d\u503c\u7684\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f\u5de6\u8fde\u63a5\uff1f<\/strong><\/p>\n<ul>\n<li> LEFT JOIN \u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\u4ee5\u53ca\u53f3\u8868\u4e2d\u7684\u5339\u914d\u884c\u3002\u5982\u679c\u672a\u627e\u5230\u5339\u914d\u9879\uff0c\u5219\u4e3a\u53f3\u8868\u4e2d\u7684\u5217\u8fd4\u56de NULL \u503c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>SQL \u4e2d\u7684 UNION \u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li> UNION \u7ec4\u5408\u4e24\u4e2a\u6216\u591a\u4e2a SELECT \u67e5\u8be2\u7684\u7ed3\u679c\u96c6\uff0c\u5220\u9664\u67e5\u8be2\u4e4b\u95f4\u7684\u91cd\u590d\u884c\u3002\u6240\u6709 SELECT \u8bed\u53e5\u4e2d\u7684\u5217\u5fc5\u987b\u5177\u6709\u76f8\u540c\u7684\u7f16\u53f7\u548c\u6570\u636e\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>UNION \u548c UNION ALL \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong><\/p>\n<ul>\n<li> UNION \u5220\u9664\u91cd\u590d\u884c\uff0c\u800c UNION ALL \u5305\u62ec\u5408\u5e76\u7ed3\u679c\u96c6\u4e2d\u7684\u6240\u6709\u91cd\u590d\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f GROUP BY \u5b50\u53e5\uff1f<\/strong><\/p>\n<ul>\n<li> GROUP BY \u5c06\u5177\u6709\u76f8\u540c\u503c\u7684\u884c\u5206\u7ec4\u4e3a\u6c47\u603b\u884c\uff0c\u901a\u5e38\u4e0e SUM()\u3001AVG()\u3001COUNT()\u3001MIN() \u548c MAX() \u7b49\u4e00\u8d77\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3> B. \u4e2d\u7ea7MySQL\u95ee\u9898\uff1a <\/h3>\n<ol>\n<li>\n<p><strong>MySQL \u4e2d\u7684\u7d22\u5f15\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li>\u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u63d0\u9ad8\u8868\u4e0a\u6570\u636e\u68c0\u7d22\u64cd\u4f5c\u7684\u901f\u5ea6\u3002\u7528\u4e8e\u5feb\u901f\u5b9a\u4f4d\u6570\u636e\uff0c\u65e0\u9700\u626b\u63cf\u5168\u8868\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL \u4e2d\u6709\u54ea\u4e9b\u4e0d\u540c\u7c7b\u578b\u7684\u7d22\u5f15\uff1f<\/strong><\/p>\n<ul>\n<li>MySQL\u4e2d\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\u5305\u62ec\uff1a\n<ul>\n<li> <strong>\u4e3b\u7d22\u5f15<\/strong>\uff1a\u4e3a\u4e3b\u952e\u81ea\u52a8\u521b\u5efa\u3002<\/li>\n<li> <strong>\u552f\u4e00\u7d22\u5f15<\/strong>\uff1a\u786e\u4fdd\u7d22\u5f15\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002<\/li>\n<li> <strong>\u5168\u6587\u7d22\u5f15<\/strong>\uff1a\u7528\u4e8e\u6587\u672c\u641c\u7d22\u3002<\/li>\n<li> <strong>\u590d\u5408\u7d22\u5f15<\/strong>\uff1a\u591a\u5217\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f\u6807\u51c6\u5316\uff1f<\/strong><\/p>\n<ul>\n<li>\u89c4\u8303\u5316\u662f\u7ec4\u7ec7\u6570\u636e\u5e93\u8868\u4ee5\u51cf\u5c11\u5197\u4f59\u5e76\u63d0\u9ad8\u6570\u636e\u5b8c\u6574\u6027\u7684\u8fc7\u7a0b\u3002\u5b83\u6d89\u53ca\u5c06\u5927\u8868\u5212\u5206\u4e3a\u8f83\u5c0f\u7684\u76f8\u5173\u8868\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f\u975e\u89c4\u8303\u5316\uff1f<\/strong><\/p>\n<ul>\n<li>\u975e\u89c4\u8303\u5316\u662f\u7ec4\u5408\u8868\u4ee5\u51cf\u5c11\u8054\u63a5\u6570\u91cf\u5e76\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u7684\u8fc7\u7a0b\uff0c\u901a\u5e38\u7528\u4e8e\u8bfb\u53d6\u5bc6\u96c6\u578b\u5e94\u7528\u7a0b\u5e8f\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>HAVING \u5b50\u53e5\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li> HAVING \u7528\u4e8e\u5728\u5e94\u7528\u805a\u5408\u540e\u8fc7\u6ee4\u8bb0\u5f55\uff0c\u901a\u5e38\u4e0e GROUP BY \u4e00\u8d77\u4f7f\u7528\u3002\u5b83\u4e0e WHERE \u7c7b\u4f3c\uff0c\u4f46 WHERE \u5728\u805a\u5408\u4e4b\u524d\u5e94\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f\u5b58\u50a8\u8fc7\u7a0b\uff1f<\/strong><\/p>\n<ul>\n<li>\u5b58\u50a8\u8fc7\u7a0b\u662f\u4e00\u7ec4\u53ef\u4ee5\u4f5c\u4e3a\u5355\u4e2a\u5355\u5143\u6267\u884c\u7684 SQL \u8bed\u53e5\u3002\u5b83\u5b58\u50a8\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u7279\u5b9a\u7684\u540d\u79f0\u6765\u8c03\u7528\uff0c\u5e38\u7528\u4e8e\u5c01\u88c5\u590d\u6742\u7684\u903b\u8f91\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL \u4e2d\u7684\u89e6\u53d1\u5668\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li>\u89e6\u53d1\u5668\u662f\u4e00\u7ec4 SQL \u8bed\u53e5\uff0c\u5f53\u8868\u4e0a\u53d1\u751f\u6307\u5b9a\u4e8b\u4ef6\uff08INSERT\u3001UPDATE\u3001DELETE\uff09\u65f6\u81ea\u52a8\u6267\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL \u4e2d\u7684\u89c6\u56fe\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li>\u89c6\u56fe\u662f\u57fa\u4e8e SELECT \u67e5\u8be2\u7ed3\u679c\u7684\u865a\u62df\u8868\u3002\u5b83\u5e76\u4e0d\u7269\u7406\u5b58\u50a8\u6570\u636e\uff0c\u800c\u662f\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u5316\u590d\u6742\u67e5\u8be2\u7684\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL \u4e2d\u7684\u4e8b\u52a1\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li>\u4e8b\u52a1\u662f\u4f5c\u4e3a\u5355\u4e2a\u5de5\u4f5c\u5355\u5143\u6267\u884c\u7684 SQL \u8bed\u53e5\u5e8f\u5217\u3002\u5b83\u9075\u5faa ACID \u5c5e\u6027\uff08\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u3001\u9694\u79bb\u6027\u3001\u6301\u4e45\u6027\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f ACID \u5c5e\u6027\uff1f<\/strong><\/p>\n<ul>\n<li> <strong>\u539f\u5b50\u6027<\/strong>\uff1a\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u5df2\u5b8c\u6210\u6216\u6ca1\u6709\u3002<\/li>\n<li> <strong>\u4e00\u81f4\u6027<\/strong>\uff1a\u4e8b\u52a1\u5c06\u6570\u636e\u5e93\u4ece\u4e00\u79cd\u6709\u6548\u72b6\u6001\u8f6c\u53d8\u4e3a\u53e6\u4e00\u79cd\u6709\u6548\u72b6\u6001\u3002<\/li>\n<li> <strong>\u9694\u79bb<\/strong>\uff1a\u4ea4\u6613\u4e4b\u95f4\u4e92\u4e0d\u5e72\u6270\u3002<\/li>\n<li> <strong>\u6301\u4e45\u6027<\/strong>\uff1a\u4e00\u65e6\u63d0\u4ea4\u4e8b\u52a1\uff0c\u66f4\u6539\u5c31\u662f\u6c38\u4e45\u6027\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3> C. \u9ad8\u7ea7 MySQL \u95ee\u9898\uff1a <\/h3>\n<ol>\n<li>\n<p><strong>MySQL \u4e2d\u7684\u590d\u5236\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<ul>\n<li>\u590d\u5236\u662f\u5c06\u6570\u636e\u4ece\u4e00\u53f0 MySQL \u670d\u52a1\u5668\uff08\u4e3b\u670d\u52a1\u5668\uff09\u590d\u5236\u5230\u4e00\u53f0\u6216\u591a\u53f0\u670d\u52a1\u5668\uff08\u4ece\u670d\u52a1\u5668\uff09\u4ee5\u5b9e\u73b0\u5197\u4f59\u548c\u8d1f\u8f7d\u5e73\u8861\u7684\u8fc7\u7a0b\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL \u4e2d\u7684\u590d\u5236\u6709\u54ea\u4e9b\u4e0d\u540c\u7c7b\u578b\uff1f<\/strong><\/p>\n<ul>\n<li> <strong>\u4e3b\u4ece\u590d\u5236<\/strong>\uff1a\u6570\u636e\u5199\u5165\u4e3b\u673a\u5e76\u590d\u5236\u5230\u4ece\u673a\u3002<\/li>\n<li> <strong>\u4e3b\u4e3b\u590d\u5236<\/strong>\uff1a\u4e24\u53f0\u670d\u52a1\u5668\u90fd\u53ef\u4ee5\u5145\u5f53\u4e3b\u670d\u52a1\u5668\u5e76\u76f8\u4e92\u590d\u5236\u6570\u636e\u3002<\/li>\n<li> <strong>\u7ec4\u590d\u5236<\/strong>\uff1a\u9ad8\u53ef\u7528MySQL\u96c6\u7fa4\u7684\u591a\u4e3b\u590d\u5236\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4ec0\u4e48\u662f InnoDB \u5b58\u50a8\u5f15\u64ce\uff1f<\/strong><\/p>\n<ul>\n<li>InnoDB \u662f MySQL \u4e2d\u7684\u9ed8\u8ba4\u5b58\u50a8\u5f15\u64ce\uff0c\u63d0\u4f9b\u5bf9 ACID \u517c\u5bb9\u4e8b\u52a1\u3001\u5916\u952e\u548c\u5d29\u6e83\u6062\u590d\u7684\u652f\u6301\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u5220\u9664\u3001\u622a\u65ad\u548c\u5220\u9664\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong><\/p>\n<ul>\n<li> <strong>DELETE<\/strong>\uff1a\u6839\u636e\u6761\u4ef6\u4ece\u8868\u4e2d\u5220\u9664\u884c\u3002\u53ef\u4ee5\u56de\u6eda\u3002<\/li>\n<li> <strong>TRUNCATE<\/strong>\uff1a\u4ece\u8868\u4e2d\u5220\u9664\u6240\u6709\u884c\uff0c\u4f46\u4fdd\u7559\u5176\u7ed3\u6784\u3002\u65e0\u6cd5\u56de\u6eda\u3002<\/li>\n<li> <strong>DROP<\/strong>\uff1a\u5220\u9664\u6574\u4e2a\u8868\uff0c\u5305\u62ec\u5176\u7ed3\u6784\u3002\u65e0\u6cd5\u56de\u6eda\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u5982\u4f55\u4f18\u5316 MySQL \u4e2d\u7684\u6162\u901f\u67e5\u8be2\uff1f<\/strong><\/p>\n<ul>\n<li>\u6280\u672f\u5305\u62ec\u4f7f\u7528\u6b63\u786e\u7684\u7d22\u5f15\u3001\u5206\u6790\u67e5\u8be2\u6267\u884c\u8ba1\u5212\uff08EXPLAIN\uff09\u3001\u91cd\u5199\u67e5\u8be2\u4ee5\u63d0\u9ad8\u6548\u7387\u3001\u4f7f\u7528 JOIN \u800c\u4e0d\u662f\u5b50\u67e5\u8be2\u3001\u907f\u514d SELECT * \u4ee5\u53ca\u786e\u4fdd\u786c\u4ef6\u8d44\u6e90\u5145\u8db3\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5e38\u89c1 MYSQL \u9762\u8bd5\u95ee\u9898\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A. \u521d\u7ea7MySQL\u95ee\u9898\uff1a \u4ec0\u4e48\u662f MySQL\uff1f MySQL \u662f\u4e00\u4e2a\u5f00\u6e90\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf (RDBMS)\uff0c\u5b83\u4f7f\u7528\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00 (SQL) 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AUTO_INCRMENT \u662f MySQL \u4e2d\u7684\u4e00\u9879\u529f\u80fd\uff0c\u53ef\u4ee5\u81ea\u52a8\u4e3a\u8868\u4e2d\u7684\u65b0\u8bb0\u5f55\u751f\u6210\u552f\u4e00\u6807\u8bc6\u7b26\uff0c\u901a\u5e38\u7528\u4e8e\u4e3b\u952e\u5217\u3002 SQL \u4e2d\u7684 JOIN \u5b50\u53e5\u662f\u4ec0\u4e48\uff1f JOIN \u7528\u4e8e\u6839\u636e\u76f8\u5173\u5217\u7ec4\u5408\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u884c\u3002\u7c7b\u578b\u5305\u62ec INNER JOIN\u3001LEFT 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