Question

我想将MySQL中的以下查询转换为MongoDB。需要帮助。

  SELECT customerName,city,state FROM customers 
  WHERE creditLimit > (SELECT AVG(creditLimit) FROM customers )

Answer 1

尝试一下。

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"@angular/animations": "^6.0.7",
"@angular/common": "^6.0.7",
"@angular/compiler": "^6.0.7",
"@angular/core": "^6.0.7",
"@angular/forms": "^6.0.7",
"@angular/http": "^6.0.7",
"@angular/platform-browser": "^6.0.7",
"@angular/platform-browser-dynamic": "^6.0.7",
"@angular/platform-server": "^6.0.7",
"@angular/router": "^6.0.7",
"@ng-bootstrap/ng-bootstrap": "^2.2.0",
"aspnet-prerendering": "^3.0.1",
"aspnet-webpack": "^3.0.0",
"bootstrap": "^4.1.1",
"css": "2.2.3",
"es6-shim": "0.35.3",
"event-source-polyfill": "0.0.12",
"jquery": "3.3.1",
"jwt-decode": "^2.2.0",
"material-design-icons": "^3.0.1",
"moment": "^2.22.2",
"ngx-toastr": "^8.8.0",
"nodemailer": "^4.6.7",
"popper.js": "^1.14.3",
"preboot": "6.0.0-beta.4",
"reflect-metadata": "0.1.12",
"rxjs": "^6.2.1",
"stacktrace-js": "^2.0.0",
"zone.js": "^0.8.26"
},
"devDependencies": {
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"@angular/compiler-cli": "^6.0.7",
"@angular/language-service": "^6.0.7",
"@ngtools/webpack": "^6.0.8",
"@types/chai": "4.1.4",
"@types/jasmine": "2.8.8",
"@types/jasminewd2": "~2.0.3",
"@types/node": "^10.5.1",
"@types/stacktrace-js": "0.0.32",
"@types/webpack-env": "^1.13.6",
"angular-router-loader": "^0.8.5",
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"chai": "4.1.2",
"codelyzer": "^4.4.2",
"css-loader": "^0.28.11",
"file-loader": "^1.1.11",
"html-loader": "^0.5.5",
"jasmine": "^3.1.0",
"jasmine-core": "3.1.0",
"jasmine-spec-reporter": "~4.2.1",
"karma": "2.0.4",
"karma-chai": "0.1.0",
"karma-chrome-launcher": "2.2.0",
"karma-cli": "1.0.1",
"karma-coverage-istanbul-reporter": "^2.0.1",
"karma-jasmine": "1.1.2",
"karma-jasmine-html-reporter": "^1.2.0",
"karma-webpack": "^3.0.0",
"mini-css-extract-plugin": "^0.4.1",
"ng-router-loader": "^2.1.0",
"protractor": "~5.3.2",
"style-loader": "^0.21.0",
"to-string-loader": "^1.1.5",
"ts-loader": "^4.4.2",
"ts-node": "~7.0.0",
"tslint": "^5.10.0",
"typescript": "^2.7.2",
"uglifyjs-webpack-plugin": "^1.2.7",
"url-loader": "^1.0.1",
"webpack": "^4.14.0",
"webpack-bundle-analyzer": "^2.13.1",
"webpack-cli": "^3.0.8",
"webpack-dev-middleware": "^3.1.3",
"webpack-hot-middleware": "^2.22.2",
"webpack-merge": "^4.1.3"
}

Answer 2

尝试一下，

db.customers.aggregate([
  { $match : {
    "creditLimit": { $gt: {$avg: "creditLimit"} }
  } },
  { $group: {
    customerName:'$customerName',
    city: '$city',
    state: '$state'
  } }
]);

将Mysql查询转换为Mongodb查询

2 个答案: