SQL数据库中， 简述实体、属性、字段、记录的关系 数据库里面“实体”的定义是什么？
\u7b80\u8ff0\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\u4e8c\u7ef4\u8868\u4e0e\u5b9e\u4f53\u95f4\u7684\u5173\u7cfb\uff1f\u5404\u79cd\u7c7b\u578b\u6570\u636e\u7684\u9ad8\u7b49\u754c\u9762\uff0c\u540e\u6765\u9010\u6e10\u6f14\u53d8\u6210\u6ee1\u8db3\u6240\u6709\u6570\u636e\u8bbf\u95ee\u9700\u8981\u7684\u5b8c\u6574\u89e3datamodule4.adoquery2.sql.add('SELECT\u501f\u4e66\u8bc1\u53f7,\u5bc6\u7801FROM[user]WHERE(\u501f\u4e66\u8bc1\u53f7=:tt)');
datamodule4.adoquery2.parameters[0].value:=username;
datamodule4.adoquery2.open;
\u5728\u4e3aTQuery\u6216TADOquery\u90e8\u4ef6\u8bbe\u7f6eSQL\u5c5e\u6027\u65f6\u8c03\u7528Close\u65b9\u6cd5\u603b\u662f\u5f88\u5b89\u5168\u7684\uff0c\u5982\u679cTQuery\u6216TADOquery\u90e8\u4ef6\u5df2\u7ecf\u88ab\u5173\u95ed\u4e86\uff0c\u8c03\u7528Close\u65b9\u6cd5\u65f6\u4e0d\u4f1a\u4ea7\u751f\u4efb\u4f55\u5f71\u54cd\u3002\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u4e3aSQL\u5c5e\u6027\u8bbe\u7f6e\u65b0\u7684SQL\u547d\u4ee4\u8bed\u53e5\u65f6\uff0c\u5fc5\u987b\u8981\u8c03\u7528Clear\u65b9\u6cd5\u4ee5\u6e05\u9664SQL\u5c5e\u6027\u4e2d\u73b0\u5b58\u7684SQL\u547d\u4ee4\u8bed\u53e5\uff0c\u5982\u679c\u4e0d\u8c03\u7528Clear\u65b9\u6cd5\uff0c\u4fbf\u8c03\u7528Add\u65b9\u6cd5\u5411SQL\u5c5e\u6027\u4e2d\u8bbe\u7f6eSQL\u547d\u4ee4\u8bed\u53e5\uff0c\u90a3\u4e48\u65b0\u8bbe\u7f6e\u7684SQL\u547d\u4ee4\u8bed\u53e5\u4f1a\u8ffd\u52a0\u5728\u73b0\u5b58SQL\u547d\u4ee4\u8bed\u53e5\u540e\u9762\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5e38\u5e38\u4f1a\u51fa\u73b0\u51fa\u4e4e\u610f\u6599\u7684\u67e5\u8be2\u7ed3\u679c\u751a\u81f3\u7a0b\u5e8f\u65e0\u6cd5\u8fd0\u884c\u4e0b\u53bb\u3002
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Query1.Open(\u8fd9\u6837\u4f1a\u8fd4\u56de\u4e00\u4e2a\u67e5\u8be2\u7ed3\u679c\u96c6)
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Query1.ExecSQL(\u6ca1\u6709\u8fd4\u56de\u7ed3\u679c)
\u5f53\u7136\u5728\u8bbe\u8ba1\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u7a0b\u5e8f\u8bbe\u8ba1\u4eba\u5458\u662f\u65e0\u6cd5\u786e\u5b9aTQuery\u6216TADOquery\u7ec4\u4ef6\u4e2d\u7684SQL\u8bed\u53e5\u662f\u5426\u4f1a\u8fd4\u56de\u4e00\u4e2a\u67e5\u8be2\u7ed3\u679c\u7684\u3002\u5bf9\u4e8e\u8fd9\u79cd\u60c5\u51b5\u5e94\u5f53\u7528Try\u2026Except\u6a21\u5757\u6765\u8bbe\u8ba1\u7a0b\u5e8f\u3002\u5728Try\u90e8\u5206\u8c03\u7528Open\u65b9\u6cd5\uff0c\u800c\u5728Except\u90e8\u5206\u8c03\u7528ExceSQL\u65b9\u6cd5\uff0c\u8fd9\u6837\u624d\u80fd\u4fdd\u8bc1\u7a0b\u5e8f\u7684\u6b63\u786e\u8fd0\u884c\u3002
\u4f8b\u5982\uff1a
Try
Query1.Open
Except
Query1.ExecSQL
End
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nSQL\u8bed\u53e5\u4e2d\u4e0d\u80fd\u5305\u542bORDERBY\u547d\u4ee4
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5.7.2\u5de5\u4f5c\u4eba\u5458\u8fdb\u884c\u56fe\u4e66\u5f52\u8fd8\u529f\u80fd\u5b9e\u73b0
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5.8\u56fe\u4e66\u9986\u7ba1\u7406\u5458\u6a21\u5757\u7684\u5b9e\u73b0
5.8.1\u56fe\u4e66\u9986\u7ba1\u7406\u5458\u56fe\u4e66\u7ba1\u7406\u529f\u80fd\u7684\u5b9e\u73b0
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5.8.2\u56fe\u4e66\u9986\u7ba1\u7406\u5458\u5de5\u4f5c\u4eba\u5458\u548c\u7ba1\u7406\u5458\u7ba1\u7406\u529f\u80fd\u7684\u5b9e\u73b0
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5.8.5\u56fe\u4e66\u9986\u7ef4\u62a4\u501f\u9605\u8005\u7ba1\u7406\u529f\u80fd\u7684\u5b9e\u73b0
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5.9\u7cfb\u7edf\u4fe1\u606f\u663e\u793a\u7684\u5b9e\u73b0
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\u89c6\u9891\u8bb2\u89e3\u7684\u662fmysql\u6570\u636e\u5e93\u4e2d\u5b9e\u4f53\u4e4b\u95f4\u5173\u7cfb\u7684\u4e09\u79cd\u65b9\u5f0f\u7684\u4e00\u4e2a\u6982\u8ff0\uff0c\u5206\u522b\u662f\u4e00\u5bf9\u4e00\uff0c\u4e00\u5bf9\u591a\uff0c\u591a\u5bf9\u591a\u5173\u7cfb\u3002\u5b9e\u4f53\u5173\u7cfb\u63cf\u8ff0\u7684\u662f\u73b0\u5b9e\u4e16\u754c\u4e2d\u5b58\u5728\u7684\u4e2a\u4f53\u4e4b\u95f4\u7684\u8054\u7cfb\u3002
计算机世界里将一个实体的可区分唯一的一些描述组合成一条记录,那实体的描述称为记录的字段.
比如学生是一个实体,学生有它的属性(学号,姓名,年龄,班级,学科等),学号就是能区分唯一的;学生中有个叫王三的2年级学生,学号是20235,那么王三的这一条信息就称为记录,记录里面每个信息就是它的字段.
扩展阅读：mysql数据库面试题 ... sql中as的基本用法 ... 数据库中sql有什么特点 ... sql和python哪个难学 ... 数据库的as是什么意思 ... 数据库备份的三种方法 ... sql as是什么意思 ... 在数据库中执行sql脚本 ... 数据库中as的作用是什么 ...
