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php - How to write mysql to set the field sales to numeric quantity when it is null, otherwise set sales to the original sales+quantity?

There is an int type field sales in the item table. How to use SQL to update the sales volume? When the sales field is null, set it to the numerical quantity. Otherwise, set sales to the original sales+quantity?

為情所困 2017-05-16 13:00:43 0  1  511

Could you please tell me how to use the mouse to drag the specified code to delete the slash//comment shortcut key?

Could you please tell me how to use the mouse to drag the specified code to delete the slash//comment shortcut key?

l亮哥 2019-12-24 16:01:19 0  1  1336

nginx - How to determine which language the website uses to develop the backend?

Question: How to determine which language the website uses to develop the backend?

巴扎黑 2017-05-16 17:03:58 0  11  1311

javascript - vuejs+elementui shopping cart price calculation, click the plus or minus sign to modify the quantity and the total price will not change, but the calculation is executed

The function of placing an order for a product finds all the products, clicks to place the order, and then adds the ordered products to the shopping cart. The shopping cart does not need to save the products. You can modify the quantity and calculate the total price. Now the calculation in my method...

巴扎黑 2017-07-05 10:58:23 0  2  1418

javascript - How to implement the drag-and-drop function of jquery ui to stop drag-and-drop when certain conditions are met

As shown in the picture, I can drag the small dot in the lower right corner to zoom the image. Since the zoom function of jquery ui cannot be satisfied, I wrote this myself. Now I need to drag the small dot in the lower right corner to the position in Figure 2. , you can no longer continue dragging ...

某草草 2017-05-19 10:42:24 0  1  558

May I ask what the tool used by Master Miejie to determine the size? ?

May I ask what the tool used by Master Miejie to determine the size? ?

外星人 2018-08-10 08:10:56 0  1  1666

javascript - How to determine the angle of touchmove movement

Rotate according to the rotation of the gesture. How to determine the angle of the gesture? {Code...} I simply printed it but there is no good idea. These parameters have no problem with the angle.

迷茫 2017-06-08 11:02:58 0  3  1100

How to determine whether the static insertion or static update of the model is successful?

After the static methods create and update of the tp5 model, how to determine whether the operation is successful?

phpcn_u16587 2022-03-01 22:56:05 0  1  1579

How to determine whether the database libraries and tables exist?

For example, how to determine whether the database libraries and tables exist?

正念的奇跡 2017-08-08 10:47:41 0  2  1381

How does PHP correctly determine the browser used by the customer to access?

RT, but many browsers now use browsers from other companies, resulting in inaccurate judgment. For example, when I use QQ browser to visit, the records are from Google... Is there any accurate way to determine the browser used by the user to access?

ringa_lee 2017-05-16 12:59:13 0  2  433

Use mouse wheel for page zoom, click and drag to pan the page

How to create scrolling and panning effects for the entire page using the mouse wheel? Basically just like any 2D editor, scroll to zoom and click and drag to pan, but for the entire body. I can't find any information about it online.

P粉308783585 2024-03-26 14:11:27 0  1  510

javascript - What is the difference between Img.complete and img.onload to determine when the image is loaded?

What is the difference between the two to determine whether the image is loaded? Generally, the onload event will be called back when the loading is completed. Is img.complete still necessary?

PHP中文網(wǎng) 2017-06-28 09:22:52 0  4  1233

javascript - Using Jquery to determine two DIV events at the same time

Use jQuery to determine that the mouse has moved out of DIV1 and DIV2 at the same time and then trigger the alert('abc'); event! How to achieve

代言 2017-06-26 10:50:51 0  4  973

Hello teacher, if the sub-window is opened through the main window event, how to determine whether the sub-window is closed?

Hello teacher, if the sub-window is opened through the main window event, how to determine whether the sub-window is closed?

湖北帛裳制衣**** 2019-07-24 09:19:46 0  2  1316

javascript - How to determine whether the DOM element is loaded? Including dynamically added with JS

domcontentloaded can determine whether the page DOM is loaded, but it cannot determine whether it is dynamically added. How to determine this?

淡淡煙草味 2017-05-19 10:10:59 0  2  587

The PC website uses nginx to determine whether the mobile phone or tablet is accessed and jumps to the http://wap.com web page specially designed for WAP.

The PC website uses nginx to determine whether the mobile phone or tablet is accessed and jumps to the http://wap.com web page specially designed for WAP.

我想大聲告訴你 2017-05-16 17:16:11 0  1  978

python - How to determine if the crawler has logged in successfully?

I read this tutorial: https://github.com/xchaoinfo/fuck-login/blob/master/015%20CSDN/csdn.py. This is the code to simulate logging into csdn, which uses response.status_code (the code in the above link) Line 63) is equal to 200 to determine whether the login is successful, but...

PHPz 2017-05-18 10:52:58 0  1  1464

javascript - How to determine the drawn graphics under CANVAS

How do I judge what I am drawing on the canvas? For example, I use lines to draw a heart or a V. . How to determine whether it is heart or V? . And judge the similarity between two people's paintings. The condition can be one stroke, not multiple strokes

PHP中文網(wǎng) 2017-05-16 13:27:54 0  2  761

The rewritten title is: How to make an autofill slider with a gradient background in HTML

I'm just playing around with HTML and I want to make a slider that fills itself with a gradient, but I'm finding this to be nearly impossible. I've been researching for a few hours but can't seem to find the answer. I think I need JS but I'm completely blank there. .slidecontainer{justify-content:ce...

P粉715228019 2024-02-03 20:57:38 0  2  634

mysql - How to insert into the database after drag and drop reordering?

It is an article pagination, for example, ten pages, and the serial number is 1-10; one page stores a piece of data, but how do I sort it in the database after dragging it randomly?? The drag-and-drop modifications of each page are saved in the database in real time. I Now there are two ideas. One i...

某草草 2017-05-18 10:56:17 0  1  1239