Lesson 10 Conditional control statements have no sound

Lesson 10 Conditional control statements have no sound

无名小辈 2020-02-15 18:59:52 0  0  1349

Using media query conditional statements in Tailwind CSS

How to express this ${window.scrollY>0?"bg-slate-50":""}Conditional statement checking only for Tailwind with medium or large screen sizes?

P粉835428659 2023-08-10 15:17:27 0  2  565

Newcomer, I would like to ask MySQL for advice on the sql statement for querying after judging and concatenating conditions.

I want to implement the statement of executing the splicing condition when b.phase>2: AND unix_timestamp()> second_end_time, otherwise the splicing condition: AND unix_timestamp()> thirdly_end_time. Can you please tell me how to write this SQL? SELECT * FROM data a, race bWHEREa...

世界只因有你 2017-05-18 10:45:28 0  1  656

python - How to execute multiple SQL statements at once

Suppose there are multiple such statements: {code...} We can summarize it into the format of select xxx from yyy. How to execute multiple such statements at one time in Python, where xxx and yyy are variable .

習慣沉默 2017-05-25 15:08:08 0  1  2075

Embedding query operations in MySQL IF statements

Is there a way to run insert query in IF statement, I know the syntax of if statement is IF (condition, statement to be executed if condition is true, statement to be executed if condition is false) My question is if it is possible to run insert statement based on condition, For example IF((select c...

P粉155832941 2024-02-17 16:44:15 0  1  510

laravel - There are "and, or" in the PHP conditional judgment at the same time. What is the priority?

If there are "and, or" in the PHP conditional judgment at the same time, what is the priority? For example: {code...} There are 3 conditions in the if statement: {code...} What I want to express is that the first condition must be met, and only one of the second and third conditions must b...

習慣沉默 2017-05-16 12:02:33 0  5  585

TP6 How to use exec to execute statements in batches

Currently using the framework TP6, I need to execute statements in batches except for queries, but TP6's execute seems not to be able to execute statements in batches (such as: execute("Update statement first; Update statement second;") This will report an error), I think I need PDO's exec...

lis 2020-12-16 17:06:22 0  1  1130

php - Problem with Sql conditional statement

A sql statement has an employee id field after group by and is put together through the group concat function. Now the business requires finding the result where the employee id is a, then the employee field must be filtered out whether it only has a or contains a. This How to write it?

阿神 2017-05-19 10:08:19 0  3  541

c++ - What does this conditional statement mean?

Please help explain the meaning of the second if statement of the function sting::size_type find_char(const string &s,char c,string::size_type &occurs){auto ret = s.size();occurs = 0;for(decltype(ret ) i = 0;i != s.size(); ++i){ if...

漂亮男人 2017-06-19 09:07:35 0  1  982

objective-c - BOOL变量在if条件语句的理解(OC)

在一个计算器的逻辑实现文件里，先声明了一个BOOL类型变量 BOOL isPlus; 然后在calculator的逻辑方法里，条件判断 {代码...} 方法中有定义 isPlus = false； 其中 if (isPlus) 是指其条件为false的情况下，执行下...

怪我咯 2017-04-24 09:13:37 0  2  738

Targeting Outlook.com with CSS/Conditional Statements in 2022?

I'm having a serious problem sending emails, specifically the browser version of Outlook (webmail). All solutions that worked in the past no longer work in 2022: [owa].foo{background-color:red!important;}[class="x_foo"]{background-color:red!important;} I also tried this Various conditional...

P粉155710425 2024-03-28 22:52:27 0  1  462

php - Processing of reverse LIKE of sql statement

It is normal to use LIKE in SQL statements. But is there any reverse LIKE syntax? That is to say, it is not that the field contains a string, but that the string contains the field content. Find out if the conditions are met. Please help me!

阿神 2017-05-24 11:33:03 0  1  615

mysql statement writing

A table has six fields ABCDEF. The requirement is to find out whether ABCD is consistent and merge it into one, and count how many different E's there are in the merged number. Or in other words, abcd is the same and one piece of data is counted, and then abcd is the same. The data is deduplicated, ...

漂亮男人 2017-05-18 10:49:22 0  2  645

Is there a way to dynamically obtain query conditions in TP5 and not add this condition if the value is empty?

As shown in the figure below, there are three query conditions, the first two are time intervals, and the last one is a fuzzy query based on name. If the content written at the beginning is empty, then the data with the field value being null will be returned according to the where condition. So I a...

3维 2019-10-05 13:58:01 0  0  1293

How to use two conditional statements in VueJS

I'm creating a sidebar with a lot of functionality so I need to add two conditions to my :class but I don't know how to do it. This is what I did: :class="showSidebar?'open':'closed',showSidebarMini?'openmini':'closedmini'"

P粉877719694 2024-02-17 15:36:23 0  2  393

mysql - 24 consecutive sql statements, check one by one, is it better to union all?

These 24 consecutive lines are similar, but the conditions are different, such as 9 o'clock to 10 o'clock, 10 o'clock to 11 o'clock

滿天的星座 2017-06-08 11:03:29 0  3  931

mongodb查询语句怎么合并查询结果？

想用一条语句查询三条记录，包括当前记录、上一条、下一条，怎么实现？只知道当前记录的_id，需要按另外一个时间字段排序取相临的记录。

迷茫 2017-05-02 09:22:41 0  1  628

An error occurred during database statement execution

An error occurred when the database executed this statement: insert into liuyan (title,content,id) values ​​('$title','$content','$_SESSION[id]'); Error: #1366 - Incorrect integer value: ' $_SESSION[id]' for column 'id

圆子 2019-05-01 15:49:14 0  1  944

php conditional loop error condition

Please tell me, if the condition is true, why it doesn't show "ok"? I don't understand why it displays "No" if the condition is triggered. <?phpif(get_number()=="ok"){echo "ok";}else{echo "no";}functionget_number(){$number=rand(1,10);echo$number;i...

P粉536532781 2023-09-07 22:34:01 0  2  544

Print sql statement

How to print sql statements except queries

张默 2019-08-05 11:22:17 0  0  1125