suppose I want to grant the permissions of select to all users in the database. How do I do that? ...
Environment: mysql 5.7 transaction isolation level repeatable read The current record of table is as follows: : : id = 2 : SQL my question is: why does my session need to be submitted again in order to view the updated data of session II...
after reading this article (introducing schema in the database) https: www.biaodianfu.com da., it is mentioned that the schema in MySQL is the same as the library. Is this correct? Thank you ....
:win10 :docker mysql:5.7 $con = mysqli_connect("127.0.0.1","root","root"); var_dump(mysqli_connect_error()); :string(18) "Connection refused" $con2 = mysqli_connect("localhost","root","ro...
as shown in the question, is there only data or indexes on the hard disk and in a data page in innodb_pool_buffer? is it impossible for a data page to have both data and indexes? ...
1. What kind of record is used in the card game record? I think MongoDB would be better, wouldn t it? 2. Is the logic of playing cards in any language? Is it okay to develop with php ? 3. are the rules of the game and card logic quite difficult? ...
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var data = [{ id:1 } ,{ id:2 } ,{ id:3 }] is similar to this structure. An element object in data corresponds to a record in a database table. then Sequelize how to do it all at once? ...
1: { name: A , age: 10 } 2: [{ id:1, name: A , 1name book: xxx }, { id:2, name: A , book: xxx }] name A book are all stored in Table 2. How to deal with a table structure like this? ...
windows platform, zip unzipped and installed my.ini [mysql] -sharp mysql default-character-set=utf8 [mysqld] -sharp3306 port = 3306 -sharp mysql basedir=C: Program Files MYSQL mysql-8.0.11-winx64 -sharp mysql datadir=C: Program Files MYSQL mys...
recommend the learning materials of mysql. I don t feel very thorough ....
Server An is old, with php + apache + mysql applications Server B s application wants to use A s mysql data is there a simple way, except for server A to write api ...
In the high concurrency environment, I want to record the number of clicks per click. The database self-increasing field is id , but there is already a lot of data in it. You can t use id to identify the clicks. If there is any way of thinking, there w...
encountered a problem today that requires association replacement between a customer table and a card update table. the demand is this: some customers change several cards a day, each time the card number will be renewed, the old card number will not b...
The index is a data structure in which the leaf node of the b + tree holds pointers to the actual rows. what about clustered indexes? what does InnoDB s clustered index mean by storing B+Tree indexes and data rows in the same structure? Does mean that...
RT, checks the log and finds that at the same time, accurate to seconds, there are multiple requests for the same method, and the parameters are the same, and all are executed, resulting in multiple messages being inserted into the database. The server i...
has a table, table_x, field A has a duplicate value: now you want to return the result of the sample diagram through the select query, counting the number of times the value of the corresponding field An is repeated. The ideal effect is shown in figur...
as shown in the figure above, how to use the MySQL statement to find out the number of people in the company and each department at a time? ...
there is a requirement: A notice is sent to specify who can read it. the simplest solution to take advantage of mysql: message Information Table id Information ID name content < hr > message_user user View Information Table id message_id Inf...
error log: [Sat May 05 20:24:44.208053 2018] [mpm_winnt:crit] [pid 15392:tid 312] AH02538: Child: Parent process exited abruptly. Child process is ending Starting the Apache2a service The Apache2a service is running. [core:warn] [pid 15004:tid 420] AH...
has the following array [ {name: , age: 15}, {name: , age: 14}, {name: , age: 13}, {name: , age: 22}, {name: , age: 16}, {name: , age: 18}, ] can we use regular and findIndex-like methods to match all index? with ...
my computer used to be used by someone else; now I use this computer to submit code to my github; but the github information of previous computer users is displayed on github, as shown below: the red box contains the information of previous computer...
problem: when collecting a page, it may return empty content due to network reasons, but this collection record is recorded in the DupeFilter of redis, so that it cannot be collected again. excuse me: how to manually remove the failed url from the xx:Du...
I now encounter js dynamic loading content: there are only three crawling methods: 1: use the browser to crawl 2: look at the js source code, parse the parameters 3: sometimes the relevant parameters will appear in other parts of the page, carefully l...
directory level webpack vue -sharpshadow-rootclosed elementsfill ...