{"id":862,"date":"2025-02-18T18:47:49","date_gmt":"2025-02-18T10:47:49","guid":{"rendered":"https:\/\/eve2333.top\/?p=862"},"modified":"2025-02-18T18:47:49","modified_gmt":"2025-02-18T10:47:49","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e5%85%a5%e9%97%a8%e5%88%b0%e5%a4%a7%e8%9b%87%e5%b0%9a%e7%a1%85%e8%b0%b7%e5%ae%8b%e7%ba%a2%e5%ba%b7%e8%80%81%e5%b8%88%e7%ac%94%e8%ae%b0-%e5%9f%ba%e7%a1%80","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=862","title":{"rendered":"\u200bMySQL\u6570\u636e\u5e93\u5165\u95e8\u5230\u5927\u86c7\u5c1a\u7845\u8c37\u5b8b\u7ea2\u5eb7\u8001\u5e08\u7b14\u8bb0 \u57fa\u7840\u7bc7 part 14"},"content":{"rendered":"\n

 \u7b2c14\u7ae0_\u89c6\u56fe<\/h1>\n\n\n\n

\u6211\u53bb\u4e86\u9762\u8bd5\uff0c\u91cd\u70b9\u8003\u5bdf\u589e\u5220\u6539\u67e5\u3001\u89c6\u56fe\u3001\u5b58\u50a8\u8fc7\u7a0b\u3001\u51fd\u6570<\/p>\n\n\n\n

 1. \u5e38\u89c1\u7684\u6570\u636e\u5e93\u5bf9\u8c61<\/h2>\n\n\n\n
\u5bf9\u8c61<\/th>\u63cf\u8ff0<\/th><\/tr><\/thead>
\u8868 (TABLE)<\/td>\u8868\u662f\u5b58\u50a8\u6570\u636e\u7684\u903b\u8f91\u5355\u5143\uff0c\u4ee5\u884c\u548c\u5217\u7684\u5f62\u5f0f\u5b58\u5728\uff0c\u5217\u5c31\u662f\u5b57\u6bb5\uff0c\u884c\u5c31\u662f\u8bb0\u5f55<\/td><\/tr>
\u6570\u636e\u5b57\u5178<\/td>\u5c31\u662f\u7cfb\u7edf\u8868\uff0c\u5b58\u653e\u6570\u636e\u5e93\u76f8\u5173\u4fe1\u606f\u7684\u8868\u3002\u7cfb\u7edf\u8868\u7684\u6570\u636e\u901a\u5e38\u7531\u6570\u636e\u5e93\u7cfb\u7edf\u7ef4\u62a4\uff0c\u7a0b\u5e8f\u5458\u901a\u5e38\u4e0d\u5e94\u8be5\u4fee\u6539\uff0c\u53ea\u53ef\u67e5\u770b<\/td><\/tr>
\u7ea6\u675f (CONSTRAINT)<\/td>\u6267\u884c\u6570\u636e\u6821\u9a8c\u7684\u89c4\u5219\uff0c\u7528\u4e8e\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\u7684\u89c4\u5219<\/td><\/tr>
\u89c6\u56fe (VIEW)<\/td>\u4e00\u4e2a\u6216\u8005\u591a\u4e2a\u6570\u636e\u8868\u91cc\u7684\u6570\u636e\u7684\u903b\u8f91\u663e\u793a\uff0c\u89c6\u56fe\u5e76\u4e0d\u5b58\u50a8\u6570\u636e<\/td><\/tr>
\u7d22\u5f15 (INDEX)<\/td>\u7528\u4e8e\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u76f8\u5f53\u4e8e\u4e66\u7684\u76ee\u5f55<\/td><\/tr>
\u5b58\u50a8\u8fc7\u7a0b (PROCEDURE)<\/td>\u7528\u4e8e\u5b8c\u6210\u4e00\u6b21\u5b8c\u6574\u7684\u4e1a\u52a1\u5904\u7406\uff0c\u6ca1\u6709\u8fd4\u56de\u503c\uff0c\u4f46\u53ef\u901a\u8fc7\u4f20\u51fa\u53c2\u6570\u5c06\u591a\u4e2a\u503c\u4f20\u7ed9\u8c03\u7528\u73af\u5883<\/td><\/tr>
\u5b58\u50a8\u51fd\u6570 (FUNCTION)<\/td>\u7528\u4e8e\u5b8c\u6210\u4e00\u6b21\u7279\u5b9a\u7684\u8ba1\u7b97\uff0c\u5177\u6709\u4e00\u4e2a\u8fd4\u56de\u503c<\/td><\/tr>
\u89e6\u53d1\u5668 (TRIGGER)<\/td>\u76f8\u5f53\u4e8e\u4e00\u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u5f53\u6570\u636e\u5e93\u53d1\u751f\u7279\u5b9a\u4e8b\u4ef6\u540e\uff0c\u89e6\u53d1\u5668\u88ab\u89e6\u53d1\uff0c\u5b8c\u6210\u76f8\u5e94\u7684\u5904\u7406         <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

2.1 \u4e3a\u4ec0\u4e48\u4f7f\u7528\u89c6\u56fe\uff1f<\/h3>\n\n\n\n

74-\u6570\u636e\u5e93\u5bf9\u8c61\u4e0e\u89c6\u56fe\u7684\u7406\u89e3_\u54d4\u54e9\u54d4\u54e9_bilibili<\/a>\u4ece7.30\u770b\u523015.30\u5373\u53ef<\/p>\n\n\n\n

 \u89c6\u56fe\u662f\u4e00\u79cd\u865a\u62df\u8868\uff0c\u672c\u8eab\u662f\u4e0d\u5177\u6709\u6570\u636e\u7684\uff0c\u5360\u7528\u5f88\u5c11\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u5b83\u662f SQL \u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\u3002 \u89c6\u56fe\u5efa\u7acb\u5728\u5df2\u6709\u8868\u7684\u57fa\u7840\u4e0a, \u89c6\u56fe\u8d56\u4ee5\u5efa\u7acb\u7684\u8fd9\u4e9b\u8868\u79f0\u4e3a\u57fa\u8868\u3002<\/p>\n\n\n\n

\"\"<\/p>\n\n\n\n

 \u89c6\u56fe\u7684\u521b\u5efa\u548c\u5220\u9664\u53ea\u5f71\u54cd\u89c6\u56fe\u672c\u8eab\uff0c\u4e0d\u5f71\u54cd\u5bf9\u5e94\u7684\u57fa\u8868\u3002\u4f46\u662f\u5f53\u5bf9\u89c6\u56fe\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u52a0\u3001\u5220\u9664\u548c \u4fee\u6539\u64cd\u4f5c\u65f6\uff0c\u6570\u636e\u8868\u4e2d\u7684\u6570\u636e\u4f1a\u76f8\u5e94\u5730\u53d1\u751f\u53d8\u5316\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\n\n\n\n

 \u5411\u89c6\u56fe\u63d0\u4f9b\u6570\u636e\u5185\u5bb9\u7684\u8bed\u53e5\u4e3a SELECT \u8bed\u53e5, \u53ef\u4ee5\u5c06\u89c6\u56fe\u7406\u89e3\u4e3a\u5b58\u50a8\u8d77\u6765\u7684 SELECT \u8bed\u53e5 \u5728\u6570\u636e\u5e93\u4e2d\uff0c\u89c6\u56fe\u4e0d\u4f1a\u4fdd\u5b58\u6570\u636e\uff0c\u6570\u636e\u771f\u6b63\u4fdd\u5b58\u5728\u6570\u636e\u8868\u4e2d\u3002\u5f53\u5bf9\u89c6\u56fe\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u52a0\u3001\u5220 \u9664\u548c\u4fee\u6539\u64cd\u4f5c\u65f6\uff0c\u6570\u636e\u8868\u4e2d\u7684\u6570\u636e\u4f1a\u76f8\u5e94\u5730\u53d1\u751f\u53d8\u5316\uff1b\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\n\n\n\n

\u89c6\u56fe\uff0c\u662f\u5411\u7528\u6237\u63d0\u4f9b\u57fa\u8868\u6570\u636e\u7684\u53e6\u4e00\u79cd\u8868\u73b0\u5f62\u5f0f\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5c0f\u578b\u9879\u76ee\u7684\u6570\u636e\u5e93\u53ef\u4ee5\u4e0d\u4f7f\u7528\u89c6 \u56fe\uff0c\u4f46\u662f\u5728\u5927\u578b\u9879\u76ee\u4e2d\uff0c\u4ee5\u53ca\u6570\u636e\u8868\u6bd4\u8f83\u590d\u6742\u7684\u60c5\u51b5\u4e0b\uff0c\u89c6\u56fe\u7684\u4ef7\u503c\u5c31\u51f8\u663e\u51fa\u6765\u4e86\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u6211 \u4eec\u628a\u7ecf\u5e38\u67e5\u8be2\u7684\u7ed3\u679c\u96c6\u653e\u5230\u865a\u62df\u8868\u4e2d\uff0c\u63d0\u5347\u4f7f\u7528\u6548\u7387\u3002\u7406\u89e3\u548c\u4f7f\u7528\u8d77\u6765\u90fd\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n\n\n\n

1. \u89c6\u56fe\u7684\u7406\u89e3\n\n\u2460 \u89c6\u56fe\uff0c\u53ef\u4ee5\u770b\u505a\u662f\u4e00\u4e2a\u865a\u62df\u8868\uff0c\u672c\u8eab\u662f\u4e0d\u5b58\u50a8\u6570\u636e\u7684\u3002\n  \u89c6\u56fe\u7684\u672c\u8d28\uff0c\u5c31\u53ef\u4ee5\u770b\u505a\u662f\u5b58\u50a8\u8d77\u6765\u7684SELECT\u8bed\u53e5\n  \n\u2461 \u89c6\u56fe\u4e2dSELECT\u8bed\u53e5\u4e2d\u6d89\u53ca\u5230\u7684\u8868\uff0c\u79f0\u4e3a\u57fa\u8868\n\n\u2462 \u9488\u5bf9\u89c6\u56fe\u505aDML\u64cd\u4f5c\uff0c\u4f1a\u5f71\u54cd\u5230\u5bf9\u5e94\u7684\u57fa\u8868\u4e2d\u7684\u6570\u636e\u3002\u53cd\u4e4b\u4ea6\u7136\u3002\n\n\u2463 \u89c6\u56fe\u672c\u8eab\u7684\u5220\u9664\uff0c\u4e0d\u4f1a\u5bfc\u81f4\u57fa\u8868\u4e2d\u6570\u636e\u7684\u5220\u9664\u3002\n\n\u2464 \u89c6\u56fe\u7684\u5e94\u7528\u573a\u666f\uff1a\u9488\u5bf9\u4e8e\u5c0f\u578b\u9879\u76ee\uff0c\u4e0d\u63a8\u8350\u4f7f\u7528\u89c6\u56fe\u3002\u9488\u5bf9\u4e8e\u5927\u578b\u9879\u76ee\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u89c6\u56fe\u3002\n\n\u2465 \u89c6\u56fe\u7684\u4f18\u70b9\uff1a\u7b80\u5316\u67e5\u8be2; \u63a7\u5236\u6570\u636e\u7684\u8bbf\u95ee\n<\/code><\/pre>\n\n\n\n
3.\u521b\u5efa\u89c6\u56fe<\/h3>\n\n\n\n
\u00a0\"\"<\/h3>\n\n\n\n
#2. \u5982\u4f55\u521b\u5efa\u89c6\u56fe\n#\u51c6\u5907\u5de5\u4f5c\nCREATE DATABASE dbtest14;\n\nUSE dbtest14;\n\nCREATE TABLE emps\nAS\nSELECT *\nFROM atguigudb.`employees`;\n\nCREATE TABLE depts\nAS\nSELECT *\nFROM atguigudb.`departments`;\n\nSELECT * FROM emps;\n\nSELECT * FROM depts;\n\nDESC emps;\n\nDESC atguigudb.employees;\n\n\n#2.1 \u9488\u5bf9\u4e8e\u5355\u8868\n#\u60c5\u51b51\uff1a\u89c6\u56fe\u4e2d\u7684\u5b57\u6bb5\u4e0e\u57fa\u8868\u7684\u5b57\u6bb5\u6709\u5bf9\u5e94\u5173\u7cfb\nCREATE VIEW vu_emp1\nAS\nSELECT employee_id,last_name,salary\nFROM emps;\n\nSELECT * FROM vu_emp1;\n\n#\u786e\u5b9a\u89c6\u56fe\u4e2d\u5b57\u6bb5\u540d\u7684\u65b9\u5f0f1\uff1a\nCREATE VIEW vu_emp2\nAS\nSELECT employee_id emp_id,last_name lname,salary #\u67e5\u8be2\u8bed\u53e5\u4e2d\u5b57\u6bb5\u7684\u522b\u540d\u4f1a\u4f5c\u4e3a\u89c6\u56fe\u4e2d\u5b57\u6bb5\u7684\u540d\u79f0\u51fa\u73b0\nFROM emps\nWHERE salary > 8000;\n\n#\u786e\u5b9a\u89c6\u56fe\u4e2d\u5b57\u6bb5\u540d\u7684\u65b9\u5f0f2\uff1a\nCREATE VIEW vu_emp3(emp_id,NAME,monthly_sal) #\u5c0f\u62ec\u53f7\u5185\u5b57\u6bb5\u4e2a\u6570\u4e0eSELECT\u4e2d\u5b57\u6bb5\u4e2a\u6570\u76f8\u540c\nAS\nSELECT employee_id,last_name,salary \nFROM emps\nWHERE salary > 8000;\n\nSELECT * FROM vu_emp3;\n\n#\u60c5\u51b52\uff1a\u89c6\u56fe\u4e2d\u7684\u5b57\u6bb5\u5728\u57fa\u8868\u4e2d\u53ef\u80fd\u6ca1\u6709\u5bf9\u5e94\u7684\u5b57\u6bb5\nCREATE VIEW vu_emp_sal\nAS\nSELECT department_id,AVG(salary) avg_sal\nFROM emps\nWHERE department_id IS NOT NULL\nGROUP BY department_id;\n\nSELECT * FROM vu_emp_sal;\n\n#2.2 \u9488\u5bf9\u4e8e\u591a\u8868\n\nCREATE VIEW vu_emp_dept\nAS\nSELECT e.employee_id,e.department_id,d.department_name\nFROM emps e JOIN depts d\nON e.`department_id` = d.`department_id`;\n\nSELECT * FROM vu_emp_dept;\n\n#\u5229\u7528\u89c6\u56fe\u5bf9\u6570\u636e\u8fdb\u884c\u683c\u5f0f\u5316\n#\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u8f93\u51fa\u67d0\u4e2a\u683c\u5f0f\u7684\u5185\u5bb9\uff0c\u6bd4\u5982\u6211\u4eec\u60f3\u8f93\u51fa\u5458\u5de5\u59d3\u540d\u548c\u5bf9\u5e94\u7684\u90e8\u95e8\u540d\uff0c\u5bf9\u5e94\u683c\u5f0f\u4e3a\n#emp_name(department_name)\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u89c6\u56fe\u6765\u5b8c\u6210\u6570\u636e\u683c\u5f0f\u5316\u7684\u64cd\u4f5c\uff1a\n\nCREATE VIEW vu_emp_dept1\nAS\nSELECT CONCAT(e.last_name,'(',d.department_name,')') emp_info\nFROM emps e JOIN depts d\nON e.`department_id` = d.`department_id`;\n\nSELECT * FROM vu_emp_dept1;\n\n#2.3 \u57fa\u4e8e\u89c6\u56fe\u521b\u5efa\u89c6\u56fe   \u5f53\u6211\u4eec\u521b\u5efa\u597d\u4e00\u5f20\u89c6\u56fe\u4e4b\u540e\uff0c\u8fd8\u53ef\u4ee5\u5728\u5b83\u7684\u57fa\u7840\u4e0a\u7ee7\u7eed\u521b\u5efa\u89c6\u56fe\u3002\n\nCREATE VIEW vu_emp4\nAS\nSELECT employee_id,last_name\nFROM vu_emp1;\n\nSELECT * FROM vu_emp4; <\/code><\/pre>\n\n\n\n
#3. \u67e5\u770b\u89c6\u56fe\n# \u8bed\u6cd51\uff1a\u67e5\u770b\u6570\u636e\u5e93\u7684\u8868\u5bf9\u8c61\u3001\u89c6\u56fe\u5bf9\u8c61\nSHOW TABLES;\n\n#\u8bed\u6cd52\uff1a\u67e5\u770b\u89c6\u56fe\u7684\u7ed3\u6784\nDESCRIBE vu_emp1;\n\n#\u8bed\u6cd53\uff1a\u67e5\u770b\u89c6\u56fe\u7684\u5c5e\u6027\u4fe1\u606f\nSHOW TABLE STATUS LIKE 'vu_emp1';\n\n#\u8bed\u6cd54\uff1a\u67e5\u770b\u89c6\u56fe\u7684\u8be6\u7ec6\u5b9a\u4e49\u4fe1\u606f\nSHOW CREATE VIEW vu_emp1;<\/code><\/pre>\n\n\n\n
\u9488\u5bf9\u89c6\u56fe\u505adml\u64cd\u4f5c\uff0c\"\"<\/p>\n\n\n\n
#4.\"\u66f4\u65b0\"\u89c6\u56fe\u4e2d\u7684\u6570\u636e\n#4.1 \u4e00\u822c\u60c5\u51b5\uff0c\u53ef\u4ee5\u66f4\u65b0\u89c6\u56fe\u7684\u6570\u636e\nSELECT * FROM vu_emp1;\n\nSELECT employee_id,last_name,salary\nFROM emps;\n#\u66f4\u65b0\u89c6\u56fe\u7684\u6570\u636e\uff0c\u4f1a\u5bfc\u81f4\u57fa\u8868\u4e2d\u6570\u636e\u7684\u4fee\u6539\nUPDATE vu_emp1\nSET salary = 20000\nWHERE employee_id = 101;\n\n#\u540c\u7406\uff0c\u66f4\u65b0\u8868\u4e2d\u7684\u6570\u636e\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u89c6\u56fe\u4e2d\u7684\u6570\u636e\u7684\u4fee\u6539\nUPDATE emps\nSET salary = 10000\nWHERE employee_id = 101;\n\n#\u5220\u9664\u89c6\u56fe\u4e2d\u7684\u6570\u636e\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u8868\u4e2d\u7684\u6570\u636e\u7684\u5220\u9664\nDELETE FROM vu_emp1\nWHERE employee_id = 101;\n\nSELECT employee_id,last_name,salary\nFROM emps\nWHERE employee_id = 101;\n\n#4.2 \u4e0d\u80fd\u66f4\u65b0\u89c6\u56fe\u4e2d\u7684\u6570\u636e\n\nSELECT * FROM vu_emp_sal;\n\n#\u66f4\u65b0\u5931\u8d25\nUPDATE vu_emp_sal\nSET avg_sal = 5000\nWHERE department_id = 30;\n\n#\u5220\u9664\u5931\u8d25\nDELETE FROM vu_emp_sal\nWHERE department_id = 30;\n\n<\/code><\/pre>\n\n\n\n
5.2 \u4e0d\u53ef\u66f4\u65b0\u7684\u89c6\u56fe<\/p>\n\n\n\n
\u8981\u4f7f\u89c6\u56fe\u53ef\u66f4\u65b0\uff0c\u89c6\u56fe\u4e2d\u7684\u884c\u548c\u5e95\u5c42\u57fa\u672c\u8868\u4e2d\u7684\u884c\u4e4b\u95f4\u5fc5\u987b\u5b58\u5728\u4e00\u5bf9\u4e00\u7684\u5173\u7cfb\u3002\u53e6\u5916\u5f53\u89c6\u56fe\u5b9a\u4e49\u51fa\u73b0\u4ee5\u4e0b\u60c5\u51b5\u65f6\uff0c\u89c6\u56fe\u4e0d\u652f\u6301\u66f4\u65b0\u64cd\u4f5c\uff1a
- \u5728\u5b9a\u4e49\u89c6\u56fe\u7684\u65f6\u5019\u6307\u5b9a\u4e86\u201cALGORITHM=TEMPTABLE\u201d\uff0c\u89c6\u56fe\u5c06\u4e0d\u652f\u6301INSERT\u548cDELETE\u64cd\u4f5c\uff1b
- \u89c6\u56fe\u4e2d\u4e0d\u5305\u542b\u57fa\u8868\u4e2d\u6240\u6709\u88ab\u5b9a\u4e49\u4e3a\u975e\u7a7a\u53c8\u672a\u6307\u5b9a\u9ed8\u8ba4\u503c\u7684\u5217\uff0c\u89c6\u56fe\u5c06\u4e0d\u652f\u6301INSERT\u64cd\u4f5c\uff1b
- \u5728\u5b9a\u4e49\u89c6\u56fe\u7684SELECT\u8bed\u53e5\u4e2d\u4f7f\u7528\u4e86JOIN\u8054\u5408\u67e5\u8be2\uff0c\u89c6\u56fe\u5c06\u4e0d\u652f\u6301INSERT\u548cDELETE\u64cd\u4f5c\uff1b
- \u5728\u5b9a\u4e49\u89c6\u56fe\u7684SELECT\u8bed\u53e5\u540e\u7684\u5b57\u6bb5\u5217\u8868\u4e2d\u4f7f\u7528\u4e86\u6570\u5b66\u8868\u8fbe\u5f0f\u6216\u5b50\u67e5\u8be2\uff0c\u89c6\u56fe\u5c06\u4e0d\u652f\u6301INSERT\uff0c\u4e5f\u4e0d\u652f\u6301UPDATE\u4f7f\u7528\u4e86\u6570\u5b66\u8868\u8fbe\u5f0f\u3001\u5b50\u67e5\u8be2\u7684\u5b57\u6bb5\u503c\uff1b
- \u5728\u5b9a\u4e49\u89c6\u56fe\u7684SELECT\u8bed\u53e5\u540e\u7684\u5b57\u6bb5\u5217\u8868\u4e2d\u4f7f\u7528DISTINCT\u3001\u805a\u5408\u51fd\u6570\u3001GROUP BY\u3001HAVING\u3001UNION\u7b49\uff0c\u89c6\u56fe\u5c06\u4e0d\u652f\u6301INSERT\u3001UPDATE\u3001DELETE\uff1b
- \u5728\u5b9a\u4e49\u89c6\u56fe\u7684SELECT\u8bed\u53e5\u4e2d\u5305\u542b\u4e86\u5b50\u67e5\u8be2\uff0c\u800c\u5b50\u67e5\u8be2\u4e2d\u5f15\u7528\u4e86FROM\u540e\u9762\u7684\u8868\uff0c\u89c6\u56fe\u5c06\u4e0d\u652f\u6301INSERT\u3001UPDATE\u3001DELETE\uff1b
- \u89c6\u56fe\u5b9a\u4e49\u57fa\u4e8e\u4e00\u4e2a\u4e0d\u53ef\u66f4\u65b0\u89c6\u56fe\uff1b
- \u5e38\u91cf\u89c6\u56fe\u3002<\/p>\n\n\n\n
\u4e3e\u4f8b\uff1a<\/p>\n\n\n\n
mysql> CREATE OR REPLACE VIEW emp_dept
-> (ename,salary,birthday,tel,email,hiredate,dname)
-> AS SELECT ename,salary,birthday,tel,email,hiredate,dname
-> FROM t_employee INNER JOIN t_department
-> ON t_employee.did = t_department.did ;
Query OK, 0 rows affected (0.01 sec)<\/p>\n\n\n\n
mysql> INSERT INTO emp_dept(ename,salary,birthday,tel,email,hiredate,dname)
-> VALUES('\u5f20\u4e09',15000,'1995-01-08','18201587896',
'zs@atguigu.com','2022-02-14','\u65b0\u90e8\u95e8');<\/p>\n\n\n\n
#ERROR 1393 (HY000): Can not modify more than one base table through a join view 'atguigu_chapter9.emp_dept'<\/p>\n\n\n\n
\u4ece\u4e0a\u9762\u7684SQL\u6267\u884c\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\uff0c\u5728\u5b9a\u4e49\u89c6\u56fe\u7684SELECT\u8bed\u53e5\u4e2d\u4f7f\u7528\u4e86JOIN\u8054\u5408\u67e5\u8be2\uff0c\u89c6\u56fe\u5c06\u4e0d\u652f\u6301\u66f4\u65b0\u64cd\u4f5c\u3002<\/p>\n\n\n\n
\u867d\u7136\u53ef\u4ee5\u66f4\u65b0\u89c6\u56fe\u6570\u636e\uff0c\u4f46\u603b\u7684\u6765\u8bf4\uff0c\u89c6\u56fe\u4f5c\u4e3a\u865a\u62df\u8868\uff0c\u4e3b\u8981\u7528\u4e8e\u65b9\u4fbf\u67e5\u8be2\uff0c\u4e0d\u5efa\u8bae\u66f4\u65b0\u89c6\u56fe\u7684\u6570\u636e\u3002\u5bf9\u89c6\u56fe\u6570\u636e\u7684\u66f4\u6539\uff0c\u90fd\u662f\u901a\u8fc7\u5bf9\u5b9e\u9645\u6570\u636e\u8868\u91cc\u6570\u636e\u7684\u64cd\u4f5c\u6765\u5b8c\u6210\u7684\u3002<\/p>\n\n\n\n
#5. \u4fee\u6539\u89c6\u56fe\n\nDESC vu_emp1;\n\n#\u65b9\u5f0f1\nCREATE OR REPLACE VIEW vu_emp1\nAS\nSELECT employee_id,last_name,salary,email\nFROM emps\nWHERE salary > 7000;\n#\u8bf4\u660e\uff1aCREATE VIEW \u5b50\u53e5\u4e2d\u5404\u5217\u7684\u522b\u540d\u5e94\u548c\u5b50\u67e5\u8be2\u4e2d\u5404\u5217\u76f8\u5bf9\u5e94\u3002\n\n#\u65b9\u5f0f2\nALTER VIEW vu_emp1\nAS \nSELECT employee_id,last_name,salary,email,hire_date\nFROM emps;\n\n#6. \u5220\u9664\u89c6\u56fe\nSHOW TABLES;\n\nDROP VIEW vu_emp4;\n\nDROP VIEW IF EXISTS vu_emp2,vu_emp3;<\/code><\/pre>\n\n\n\n
\u5220\u9664\u89c6\u56fe\u53ea\u662f\u5220\u9664\u89c6\u56fe\u7684\u5b9a\u4e49\uff0c\u5e76\u4e0d\u4f1a\u5220\u9664\u57fa\u8868\u7684\u6570\u636e\u3002\u8bf4\u660e\uff1a\u57fa\u4e8e\u89c6\u56fea\u3001b\u521b\u5efa\u4e86\u65b0\u7684\u89c6\u56fec\uff0c\u5982\u679c\u5c06\u89c6\u56fea\u6216\u8005\u89c6\u56feb\u5220\u9664\uff0c\u4f1a\u5bfc\u81f4\u89c6\u56fec\u7684\u67e5\u8be2\u5931\u8d25\u3002\u8fd9 \u6837\u7684\u89c6\u56fec\u9700\u8981\u624b\u52a8\u5220\u9664\u6216\u4fee\u6539\uff0c\u5426\u5219\u5f71\u54cd\u4f7f\u7528\u3002<\/p>\n\n\n\n
7.\u603b\u7ed3<\/h2>\n\n\n\n
7.1 \u89c6\u56fe\u4f18\u70b9<\/h3>\n\n\n\n
1. \u64cd\u4f5c\u7b80\u5355
\u5c06\u7ecf\u5e38\u4f7f\u7528\u7684\u67e5\u8be2\u64cd\u4f5c\u5b9a\u4e49\u4e3a\u89c6\u56fe\uff0c\u53ef\u4ee5\u4f7f\u5f00\u53d1\u4eba\u5458\u4e0d\u9700\u8981\u5173\u5fc3\u89c6\u56fe\u5bf9\u5e94\u7684\u6570\u636e\u8868\u7684\u7ed3\u6784\u3001\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u8054\u5173\u7cfb\uff0c\u4e5f\u4e0d\u9700\u8981\u5173\u5fc3\u6570\u636e\u8868\u4e4b\u95f4\u7684\u4e1a\u52a1\u903b\u8f91\u548c\u67e5\u8be2\u6761\u4ef6\uff0c\u800c\u53ea\u9700\u8981\u7b80\u5355\u5730\u64cd\u4f5c\u89c6\u56fe\u5373\u53ef\uff0c\u6781\u5927\u7b80\u5316\u4e86\u5f00\u53d1\u4eba\u5458\u5bf9\u6570\u636e\u5e93\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n
2. \u51cf\u5c11\u6570\u636e\u5197\u4f59
\u89c6\u56fe\u8ddf\u5b9e\u9645\u6570\u636e\u8868\u4e0d\u4e00\u6837\uff0c\u5b83\u5b58\u50a8\u7684\u662f\u67e5\u8be2\u8bed\u53e5\u3002\u6240\u4ee5\uff0c\u5728\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u6211\u4eec\u8981\u901a\u8fc7\u5b9a\u4e49\u89c6\u56fe\u7684\u67e5\u8be2\u8bed\u53e5\u6765\u83b7\u53d6\u7ed3\u679c\u96c6\u3002\u800c\u89c6\u56fe\u672c\u8eab\u4e0d\u5b58\u50a8\u6570\u636e\uff0c\u4e0d\u5360\u7528\u6570\u636e\u5b58\u50a8\u7684\u8d44\u6e90\uff0c\u51cf\u5c11\u4e86\u6570\u636e\u5197\u4f59\u3002<\/p>\n\n\n\n
3. \u6570\u636e\u5b89\u5168
MySQL\u5c06\u7528\u6237\u5bf9\u6570\u636e\u7684\u8bbf\u95ee\u9650\u5236\u5728\u67d0\u4e9b\u6570\u636e\u7684\u7ed3\u679c\u96c6\u4e0a\uff0c\u800c\u8fd9\u4e9b\u6570\u636e\u7684\u7ed3\u679c\u96c6\u53ef\u4ee5\u4f7f\u7528\u89c6\u56fe\u6765\u5b9e\u73b0\u3002\u7528\u6237\u4e0d\u5fc5\u76f4\u63a5\u67e5\u8be2\u6216\u64cd\u4f5c\u6570\u636e\u8868\u3002\u8fd9\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a\u89c6\u56fe\u5177\u6709\u9694\u79bb\u6027\u3002\u89c6\u56fe\u76f8\u5f53\u4e8e\u5728\u7528\u6237\u548c\u5b9e\u9645\u7684\u6570\u636e\u8868\u4e4b\u95f4\u52a0\u4e86\u4e00\u5c42\u865a\u62df\u8868\u3002\"\"<\/p>\n\n\n\n
\u540c\u65f6\uff0cMySQL\u53ef\u4ee5\u6839\u636e\u6743\u9650\u5c06\u7528\u6237\u5bf9\u6570\u636e\u7684\u8bbf\u95ee\u9650\u5236\u5728\u67d0\u4e9b\u89c6\u56fe\u4e0a\uff0c\u7528\u6237\u4e0d\u9700\u8981\u67e5\u8be2\u6570\u636e\u8868\uff0c\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u89c6\u56fe\u83b7\u53d6\u6570\u636e\u8868\u4e2d\u7684\u4fe1\u606f\u3002\u8fd9\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u4fdd\u969c\u4e86\u6570\u636e\u8868\u4e2d\u6570\u636e\u7684\u5b89\u5168\u6027\u3002<\/p>\n\n\n\n
4. \u9002\u5e94\u7075\u6d3b\u591a\u53d8\u7684\u9700\u6c42 \u5f53\u4e1a\u52a1\u7cfb\u7edf\u7684\u9700\u6c42\u53d1\u751f\u53d8\u5316\u540e\uff0c\u5982\u679c\u9700\u8981\u6539\u52a8\u6570\u636e\u8868\u7684\u7ed3\u6784\uff0c\u5219\u5de5\u4f5c\u91cf\u76f8\u5bf9\u8f83\u5927\uff0c\u53ef\u4ee5\u4f7f\u7528\u89c6\u56fe\u6765\u51cf\u5c11\u6539\u52a8\u7684\u5de5\u4f5c\u91cf\u3002\u8fd9\u79cd\u65b9\u5f0f\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\u4f7f\u7528\u5f97\u6bd4\u8f83\u591a\u3002<\/p>\n\n\n\n
5. \u80fd\u591f\u5206\u89e3\u590d\u6742\u7684\u67e5\u8be2\u903b\u8f91 \u6570\u636e\u5e93\u4e2d\u5982\u679c\u5b58\u5728\u590d\u6742\u7684\u67e5\u8be2\u903b\u8f91\uff0c\u5219\u53ef\u4ee5\u5c06\u95ee\u9898\u8fdb\u884c\u5206\u89e3\uff0c\u521b\u5efa\u591a\u4e2a\u89c6\u56fe\u83b7\u53d6\u6570\u636e\uff0c\u518d\u5c06\u521b\u5efa\u7684\u591a\u4e2a\u89c6\u56fe\u7ed3\u5408\u8d77\u6765\uff0c\u5b8c\u6210\u590d\u6742\u7684\u67e5\u8be2\u903b\u8f91\u3002<\/p>\n\n\n\n
7.2 \u89c6\u56fe\u4e0d\u8db3<\/h3>\n\n\n\n
\u5982\u679c\u6211\u4eec\u5728\u5b9e\u9645\u6570\u636e\u8868\u7684\u57fa\u7840\u4e0a\u521b\u5efa\u4e86\u89c6\u56fe\uff0c\u90a3\u4e48\uff0c\u5982\u679c\u5b9e\u9645\u6570\u636e\u8868\u7684\u7ed3\u6784\u53d8\u66f4\u4e86\uff0c\u6211\u4eec\u5c31\u9700\u8981\u53ca\u65f6\u5bf9 \u76f8\u5173\u7684\u89c6\u56fe\u8fdb\u884c\u76f8\u5e94\u7684\u7ef4\u62a4\u3002\u7279\u522b\u662f\u5d4c\u5957\u7684\u89c6\u56fe\uff08\u5c31\u662f\u5728\u89c6\u56fe\u7684\u57fa\u7840\u4e0a\u521b\u5efa\u89c6\u56fe\uff09\uff0c\u7ef4\u62a4\u4f1a\u53d8\u5f97\u6bd4\u8f83\u590d \u6742\uff0c \u53ef\u8bfb\u6027\u4e0d\u597d\uff0c\u5bb9\u6613\u53d8\u6210\u7cfb\u7edf\u7684\u6f5c\u5728\u9690\u60a3\u3002\u56e0\u4e3a\u521b\u5efa\u89c6\u56fe\u7684 SQL \u67e5\u8be2\u53ef\u80fd\u4f1a\u5bf9\u5b57\u6bb5\u91cd\u547d\u540d\uff0c\u4e5f\u53ef\u80fd\u5305 \u542b\u590d\u6742\u7684\u903b\u8f91\uff0c\u8fd9\u4e9b\u90fd\u4f1a\u589e\u52a0\u7ef4\u62a4\u7684\u6210\u672c\u3002 \u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u5982\u679c\u89c6\u56fe\u8fc7\u591a\uff0c\u4f1a\u5bfc\u81f4\u6570\u636e\u5e93\u7ef4\u62a4\u6210\u672c\u7684\u95ee\u9898\u3002 \u6240\u4ee5\uff0c\u5728\u521b\u5efa\u89c6\u56fe\u7684\u65f6\u5019\uff0c\u4f60\u8981\u7ed3\u5408\u5b9e\u9645\u9879\u76ee\u9700\u6c42\uff0c\u7efc\u5408\u8003\u8651\u89c6\u56fe\u7684\u4f18\u70b9\u548c\u4e0d\u8db3\uff0c\u8fd9\u6837\u624d\u80fd\u6b63\u786e\u4f7f\u7528\u89c6 \u56fe\uff0c\u4f7f\u7cfb\u7edf\u6574\u4f53\u8fbe\u5230\u6700\u4f18 <\/p>\n\n\n\n
\u8bfe\u540e\u7ec3\u4e60<\/h1>\n\n\n\n
\n#\u7b2c14\u7ae0_\u89c6\u56fe\u7684\u8bfe\u540e\u7ec3\u4e60\n\nUSE dbtest14;\n#\u7ec3\u4e601\uff1a\n#1. \u4f7f\u7528\u8868emps\u521b\u5efa\u89c6\u56feemployee_vu\uff0c\n#\u5176\u4e2d\u5305\u62ec\u59d3\u540d\uff08LAST_NAME\uff09\uff0c\u5458\u5de5\u53f7\uff08EMPLOYEE_ID\uff09\uff0c\u90e8\u95e8\u53f7(DEPARTMENT_ID)\n\nCREATE OR REPLACE VIEW employee_vu(lname,emp_id,dept_id)\nAS\nSELECT last_name,employee_id,department_id\nFROM emps;\n\n\n#2. \u663e\u793a\u89c6\u56fe\u7684\u7ed3\u6784\nDESC employee_vu;\n\n#3. \u67e5\u8be2\u89c6\u56fe\u4e2d\u7684\u5168\u90e8\u5185\u5bb9\nSELECT * FROM employee_vu;\n\n#4. \u5c06\u89c6\u56fe\u4e2d\u7684\u6570\u636e\u9650\u5b9a\u5728\u90e8\u95e8\u53f7\u662f80\u7684\u8303\u56f4\u5185\nCREATE OR REPLACE VIEW employee_vu(lname,emp_id,dept_id)\nAS\nSELECT last_name,employee_id,department_id\nFROM emps\nWHERE department_id = 80;\n\n#\u7ec3\u4e602\uff1a\nCREATE TABLE emps\nAS\nSELECT * FROM atguigudb.employees;\n\nDESC emps;\n\n#1. \u521b\u5efa\u89c6\u56feemp_v1,\u8981\u6c42\u67e5\u8be2\u7535\u8bdd\u53f7\u7801\u4ee5\u2018011\u2019\u5f00\u5934\u7684\u5458\u5de5\u59d3\u540d\u548c\u5de5\u8d44\u3001\u90ae\u7bb1\n\nCREATE OR REPLACE VIEW emp_v1\nAS\nSELECT last_name,salary,email\nFROM emps\nWHERE phone_number LIKE '011%';\n\n\n#2. \u8981\u6c42\u5c06\u89c6\u56fe emp_v1 \u4fee\u6539\u4e3a\u67e5\u8be2\u7535\u8bdd\u53f7\u7801\u4ee5\u2018011\u2019\u5f00\u5934\u7684\u5e76\u4e14\u90ae\u7bb1\u4e2d\u5305\u542b e \u5b57\u7b26\n#\u7684\u5458\u5de5\u59d3\u540d\u548c\u90ae\u7bb1\u3001\u7535\u8bdd\u53f7\u7801\n\nCREATE OR REPLACE VIEW emp_v1\nAS\nSELECT last_name,email,phone_number,salary\nFROM emps\nWHERE phone_number LIKE '011%'\nAND email LIKE '%e%';\n\nSELECT * FROM emp_v1;\n\n#3. \u5411 emp_v1 \u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0c\u662f\u5426\u53ef\u4ee5\uff1f\n\nDESC emps;\n\n# \u5b9e\u6d4b\uff1a\u5931\u8d25\u4e86\nINSERT INTO emp_v1\nVALUES('Tom','tom@126.com','01012345');\n\n\n#4. \u4fee\u6539emp_v1\u4e2d\u5458\u5de5\u7684\u5de5\u8d44\uff0c\u6bcf\u4eba\u6da8\u85aa1000\nSELECT *\nFROM emp_v1;\n\nUPDATE emp_v1\nSET salary = salary + 1000;\n\n#5. \u5220\u9664emp_v1\u4e2d\u59d3\u540d\u4e3aOlsen\u7684\u5458\u5de5\nDELETE FROM emp_v1\nWHERE last_name = 'Olsen';\n\n#6. \u521b\u5efa\u89c6\u56feemp_v2\uff0c\u8981\u6c42\u67e5\u8be2\u90e8\u95e8\u7684\u6700\u9ad8\u5de5\u8d44\u9ad8\u4e8e 12000 \u7684\u90e8\u95e8id\u548c\u5176\u6700\u9ad8\u5de5\u8d44\n\nCREATE OR REPLACE VIEW emp_v2(dept_id,max_sal)\nAS\nSELECT department_id,MAX(salary)\nFROM emps\nGROUP BY department_id\nHAVING MAX(salary) > 12000;\n\n\nSELECT * FROM emp_v2;\n\n#7. \u5411 emp_v2 \u4e2d\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0c\u662f\u5426\u53ef\u4ee5\uff1f\n\n\u4e0d\u53ef\u4ee5\uff01\n#\u9519\u8bef\uff1aThe target table emp_v2 of the INSERT is not insertable-into\nINSERT INTO emp_v2(dept_id,max_sal)\nVALUES(4000,20000);\n\n\n#8. \u5220\u9664\u521a\u624d\u7684emp_v2 \u548c emp_v1\nDROP VIEW IF EXISTS emp_v1,emp_v2;\n\nSHOW TABLES;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
 \u7b2c14\u7ae0_\u89c6\u56fe \u6211\u53bb\u4e86\u9762\u8bd5\uff0c\u91cd\u70b9\u8003\u5bdf\u589e\u5220\u6539\u67e5\u3001\u89c6\u56fe\u3001\u5b58\u50a8\u8fc7\u7a0b\u3001\u51fd\u6570  1. \u5e38\u89c1\u7684\u6570\u636e\u5e93\u5bf9\u8c61 \u5bf9\u8c61 \u63cf\u8ff0 \u8868 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[2],"tags":[16],"class_list":["post-862","post","type-post","status-publish","format-standard","hentry","category-2","tag-sql"],"_links":{"self":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/862","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=862"}],"version-history":[{"count":2,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/862\/revisions"}],"predecessor-version":[{"id":864,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/862\/revisions\/864"}],"wp:attachment":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}