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First of all, I'm pretty new to StackOverflow so sorry if the information that I give is not complete I got a problem: I need to find a way to count a name value and then sum it. There are 2 tables with information. they got a relationship with each other ...

我已经用efcore3开发了我的API。在localhost中，我的API通常与本地数据库一起运行。这是localhost中使用的连接字符串： "DefaultConnection": "Database=cosmetic_dev;Data Source=localhost;User Id=root;Password=root", 这是我的创业公司使用MySQL的代码片段： services.AddDbContext<ApplicationDbContext>(options => .UseMyS...

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我有压缩图像，现在我想调整它们的大小，然后再移动到临时文件。 $query=mysqli_query($con,"select max(id) as pid from products"); $result=mysqli_fetch_array($query); $productid=$result['pid']+1; $dir="images/productimages/$p...

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I have tables doctor and department. The M:1 relationship between doctor and department means that the doctor can work in one department, whereas the department can have many doctors. Therefore, department is referenced in the doctor's table. The specific ...

我知道这个问题被问了很多次，但我已经用尽了所有我能找到的资源。 我试图从多个表中选择值，我在phpMyAdmin中运行查询，一切正常。但当我在php页面上尝试时，出现了以下错误： 字段列表中的未知列“t.latitude” 以下是我的疑问： $postdata = file_get_contents("php://input"); if (isset($postdata)) { $request = json_decode($postdata); $owner ...

我从数据库创建了一个edmx模型。 当我尝试使用我的模型时，出现以下错误： 我尝试了很多搜索，但没有找到任何解决办法。

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I am learning sql and for that I needed to download MySQL on my Ubunutu 20.04. I have some issues with my kernels and therefore can't use sudo. Therefore I created a virtualenv using conda and downloaded MySQL using conda install -c anaconda mysql. Now I n...

我的Linux文件包含超过4000行代码，类似于： [INSERT INTO DATAMART_QUEUE_DETAILS(EVENT_TIME,QUEUE,EVENT,TRACKNUM,QUEUE_TYPE,ASSOCIATED_ROUTING_SCRIPT,ANI,DNIS,CHANNEL_TYPE) VALUES ('2021.01.01 15:31:57','Electrolux', 'abandoned', '1609507904.86839', 'ROUTING_SCRIPT', 'Electr...

我有桌子 人 id整数 名称 电话号码 主键（id） 电话号码 id整数 呼叫者电话号码 接收器编号 年 月 白天 期间 主键（id） 我想把这些信息 名称1（作为呼叫者） 我成功了 呼叫者姓名 或与 收件人姓名 或与 呼叫者电话号码 或与 呼叫者姓名 所以我从呼叫者的电话号码或者接收者的名字和电话号码中得到名字，但不是呼叫者的名字和接收者的名字在同一个地方。

查询1是否比查询2更优化（例如对于一个比查询2更大的数据库），或者我只是用一个额外的WHERE子句加倍了工作？ 查询1： SELECT sample_data FROM table1 INNER JOIN table2 ON table1.key = table2.key WHERE table1.key = table2.key; 问题2： SELECT sample_data FROM table1 INNER JOIN table2 ON table1.key = table2.key; 因为我...

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我有一个MVC应用程序。 我调用一个数据库，把我的数据放到一个数据集中，然后把它存储在我的类中。 下面是我从数据集中存储数据的方法 public ActionResult Recovery() { List<PersonModel> lmd = new List<PersonModel>(); DataSet ds = new DataSet(); Connection.Connection con = new Connection.Conn...

我想使用我的SQL'book\u data2'文件从桌面E驱动器作为'源'。但是我在MySQL工作台中得到一个错误代码1064。你能帮我解决那个问题吗？我在下面给出代码和操作输出。 代码： SOURCE E:\DataPractice\Practice\book_data2.sql; 动作输出： 错误代码：1064。SQL语法有错误；请检查

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我有一个数据库和一个名为：products的表。 在这个表中，我有5行： ID as int Product as varchar Type as varchar KG as int Price_KG as int 现在我想做一个仪表板，在这里我可以看到一个类型产品的总价值。 例如： Now I want to see the total value of all type fruits together: (5x12)+(8*5)+(38*1)+(30*3)+(50*2)= 328 所以显示的值是32...

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