Question

遇到（我的）sql问题...

我有以下数据：

angular.module('hello', [ 'ngRoute' ]).config(function($routeProvider, $httpProvider) {

    $routeProvider.when('/', {
        templateUrl : 'home.html',
        controller : 'home',
        controllerAs : 'controller'
    }).otherwise('/');

    $httpProvider.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';
    $httpProvider.defaults.headers.common['Accept'] = 'application/json';

}).controller('navigation',

function($rootScope, $http, $location, $route) {

    var self = this;

    self.tab = function(route) {
        return $route.current && route === $route.current.controller;
    };

    $http.get('user').then(function(response) {
        if (response.data.name) {
            $rootScope.authenticated = true;
        } else {
            $rootScope.authenticated = false;
        }
    }, function() {
        $rootScope.authenticated = false;
    });

    self.credentials = {};

    self.logout = function() {
        $http.post('logout', {}).finally(function() {
            $rootScope.authenticated = false;
            $location.path("/");
        });
    }

}).controller('home', function($http) {
    var self = this;
    $http.get('resource/').then(function(response) {
        self.greeting = response.data;
    })
});

我正在寻找的结果只是14a，选择它是因为最多的行14a为x_id

Answer 1

>>> df.data.values
array(['A', 'BBB', 'CC'], dtype=object)

>>> df2.data.values
array([u'AAAAAAA'], dtype=object)

>>> df3.data.values
array(['A', 'BBB', 'CC', u'AAAAAAA'], dtype=object)

Answer 2

这是一种方法：

SELECT x_id, COUNT(*) as RecordCount
FROM
   TableName
GROUP BY
   x_id
ORDER BY
   COUNT(*) DESC
LIMIT 1

Answer 3

使用：

选择x_id，从tbl组中计数（x_id）c x_id顺序c DESC;

SQL - 查找具有最大行数的行集的id /“x_id”

3 个答案: