Database - Is there a function in mysql to check the data size??

What is the length() function in mysql? Isn't it checking the number of characters: length('Hello') //returns 7. Is there any function that returns the number of bytes? Please help!

怪我咯 2017-06-06 09:51:55 0  1  694

Ranking function in MySQL

I need to find out the ranking of customers. Here I add the corresponding ANSI standard SQL query according to my requirements. Please help me convert this to MySQL. SELECTRANK()OVER(PARTITIONBYGenderORDERBYAge)AS[PartitionbyGender],FirstName,Age,GenderFROMPerson Is there a function to query ranking...

P粉310754094 2023-08-24 00:03:12 0  2  435

AWS Aurora MySQL database cannot be queried by Node Lambda function

I'm trying to use a Lambda function to write data to an AWS AuroraMySQL database. Code For some reason it doesn't seem to work. My code so far is very simple but it doesn't execute correctly. This is a simple Lambda function that is called when a user registers to Cognito and should create a new ent...

P粉184747536 2023-08-25 21:31:48 0  1  675

function function function

The teacher told me where to find the functions provided by WeChat?

小李飞刀 2018-05-14 21:27:13 0  2  1149

Calling a function without using print(function()) format? ?

Calling a function without using print(function()) format? ? Can direct functions (parameters) be used?

力 2020-07-23 00:07:01 0  1  1279

How can a function within a function call a variable of the parent function?

var_dump(function_exists('b')); // false function a(){     $var = 123;     function b(){      &nb

喵~ 2022-12-05 19:48:12 0  0  598

Am I able to use the mysql built-in function get_lock?

There is a batch job out there. And there are multiple servers that can handle the job. I only want the job to be picked up and processed by one of the many servers during a specific time. In order to achieve this purpose, when investigating the global lock mechanism, I discovered the get_lock funct...

P粉875565683 2023-09-15 21:20:11 0  1  681

How to find where Mysql functions are used

I'm using Mysql8. In one of the views I'm working on, there is a function called calculateGP. I want to modify this function but I'm not sure if this function is used elsewhere in the database. Is there a query that would let me know if this function is referenced elsewhere in the database?

P粉573943755 2023-08-18 16:46:18 0  2  512

javascript - Questions about function closures and passing functions as parameters

1. Description: I want to get a function array result. First, the func function adds an anonymous function to the array result (each anonymous function saves its own num). But I pass in the anonymous function after return with parameters, which is equivalent to just It's just a replacement, why are ...

世界只因有你 2017-06-26 10:50:31 0  3  789

mysqli function

When using mysqli_num_rows() and other functions in the TP5.1 framework, an error will be reported. Can these functions not be used on TP?

林瑞程 2019-09-07 21:00:50 0  5  1342

javascript - Problem with function parameter default value being function in ES6?

I have a lot of confusion about the situation where the default value of a function parameter is a function, such as {code...} According to Ruan Yifeng's es6 introduction, I know that if the function parameter is a default value, there will be a block-level scope wrapping the parameter first, and af...

阿神 2017-07-05 11:09:13 0  4  1308

javascript - What is the difference between a callback function and a normal calling function?

The definition of a callback function is to pass function b as a parameter to a for execution. At this time, b is the callback function. I suddenly have a question, what is the difference between it and calling b directly in function a? I wrote a demo myself {code...} It takes about 3 seconds to see...

欧阳克 2017-06-26 10:53:07 0  2  1396

Title rewritten as: Recursive async function cannot return value

I'm making a recursive async function that is running a mysql query. This is the database I'm using: +----+-------------------+----------+---- ------+-----------+---------------------+|id|task|completed|parentid| createdby|createdat|+----+-------------------+

P粉729518806 2023-08-29 21:11:13 0  2  536

functionunset()

The tutorial says: 3. Use the function unset() to destroy the variable, but the code demonstration uses var_dump(); are unset() and var_dump() the same function? Address: //m.sbmmt.com /code/985.html

Rebecca 2022-10-19 11:04:45 0  1  1433

PHP nested function and anonymous function scope issues

{Code...} All functions and classes in PHP have global scope and can be defined within a function and called outside it, and vice versa. Why can function b obtain the local variables of function a by passing parameters? {Code...} Similarly, why does the anonymous function also obtain external variab...

phpcn_u1582 2017-05-18 10:45:34 0  1  595

javascript - What is the difference between a line of code placed inside a function and outside a function?

//Inside function {code...} //Outside function {code...} Why?

我想大声告诉你 2017-06-28 09:22:31 0  1  739

Python equivalent of the "INET6_ATON" SQL function

I want to convert a PHP program using MySQL to Python. I found a way to store the database, but I need to find a Pythonic replacement for the INET6_ATONSQL function. Can anyone help me?

P粉030479054 2023-09-06 14:36:14 0  1  445

javascript - How does the callback function access the value under the current function?

I defined an array variable in the function, which contains 6 elements, and then called the callback function in the function. The value of the array variable cannot be accessed in the callback function, but the length attribute can be accessed. I feel very confused and don't know how to solve it. {...

大家讲道理 2017-05-16 13:35:48 0  4  549

javascript - Encapsulate the repeated parts of these two functions into one function?

{Code...} The two functions are very similar (repeated). How to encapsulate the repeated parts of these two functions into one function?

大家讲道理 2017-05-19 10:09:46 0  3  605

There is no main function in javascript

There is no main function in javascript. The main function is often used in Java and C languages. It is also called the main function and is required to have a return value. Returning 0 means that the program is successfully executed normally, and returning a non-0 value means that the program ends ...

手机用户757625696 2022-04-06 13:51:04 0  0  1156