Question

我有这个问题：

SELECT * 
FROM tbl_feedback 
ORDER BY id DESC

我想只选择列'status'的字符串/ varchar“done”，列'type'是“bug”。

Answer 1

非常简单

SELECT
*
FROM tbl_feedback
WHERE
    [status] = 'done'
    AND [type] = 'bug'
ORDER BY id DESC

Answer 2

快速猜测 - 有关详细信息，请提供表格架构和一些演示数据。

SELECT * FROM tbl_feedback WHERE [status] = 'done' AND [type] = 'bug' ORDER BY id DESC

Answer 3

这很简单，你需要在where子句中添加条件。

  (function ($) {

    //demo data
    var contacts = [
        { name: "Contact 1", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "anemail@me.com", type: "family" },
        { name: "Contact 2", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "anemail@me.com", type: "family" },
        { name: "Contact 3", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "anemail@me.com", type: "friend" },
        { name: "Contact 4", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "anemail@me.com", type: "colleague" },
        { name: "Contact 5", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "anemail@me.com", type: "family" },
        { name: "Contact 6", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "anemail@me.com", type: "colleague" },
        { name: "Contact 7", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "anemail@me.com", type: "friend" },
        { name: "Contact 8", address: "1, a street, a town, a city, AB12 3CD", tel: "0123456789", email: "anemail@me.com", type: "family" }
    ];

    //define product model
    var Contact = Backbone.Model.extend({
        defaults: {
            photo: "/img/placeholder.png"
        }
    });

    //define directory collection
    var Directory = Backbone.Collection.extend({
        model: Contact
    });

    //define individual contact view
    var ContactView = Backbone.View.extend({
        tagName: "article",
        className: "contact-container",
        template: $("#contactTemplate").html(),

        render: function () {
            var tmpl = _.template(this.template);

            $(this.el).html(tmpl(this.model.toJSON()));
            return this;
        }
    });

    //define master view
    var DirectoryView = Backbone.View.extend({
        $el: $("#contacts"),

        initialize: function () {
            this.collection = new Directory(contacts);

            this.render();
        },

        render: function () {
            var that = this;
            _.each(this.collection.models, function (item) {
                that.renderContact(item);
            }, this);
        },

        renderContact: function (item) {
            var contactView = new ContactView({
                model: item
            });
            this.$el.append(contactView.render().el);
        }
    });

    //create instance of master view
    var directory = new DirectoryView();

} (jQuery));

此处SQL FIDDLE可以与

一起玩

您还可以使用列名称仅过滤select中的必需列

SELECT * 
FROM tbl_feedback 
WHERE status = 'done' and type= 'bug' 
ORDER BY id DESC

SQL Server：选择多列的位置

3 个答案: