recently, I have been studying the scheme of sub-database and sub-database. I don t have much experience. If you have any questions, I will ask you for advice. for example, an order table with fields: placing an order for id, goods, id, store, id, iss...
every amount change of the user is recorded in this table. website users about 100W, now the table is too big, thought of sub-table, how to divide it? Table structure! user id is a 32-bit guid ...
to query the data after horizontal split, suppose the data of a business is split horizontally, and the monthly records are stored in a table. The data of each table is about 1000w. There are already more than 20 tables, such as table_201606,.,table_201...
The page uses iframe to reference the Weibo path, and a black mask layer appears at the top, so that the Weibo page cannot be clicked. How to remove the black mask (the widget display effect is not satisfactory) ...
Question1: set src, for video tag and set loadstart listening method for video. Src, is also set when the method is entered, but the video cover is not displayed all the time. What s going on? Question2: what are the possible reasons for setting ...
problem description setting Chinese is invalid, I don t know why besides, my user is in Chinese, I don t know if it has any influence the platform version of the problem and what methods you have tried related codes Please paste the code ...
topic description vue asks for this kind of component, similar to JD.com Taobao, comment on Taobao, click to view the larger image, and the vue component can be switched between left and right; effect is shown in figure anyone who has, or has us...
I want to implement a click event with type as file as soon as I enter the page, and then get the selected image information. My code is var _file = document.createElement("input"); _file.setAttribute("type", "file"); _fil...