新手!查询语句
新手求助!查询语句
表A里有字段 id(自增),order_id(订单id),goods_sn(产品编码),其他字段... 查询产品编码出现最多的前10个产品的语句怎么写呀？菜鸟求助
------解决方案--------------------
- SQL code
SELECT *, count(goods_sn) as counter FROM table group by goods_sn order by goods_sn desc<br><font color="#e78608">------解决方案--------------------</font><br><br>SELECT COUNT(*) AS CT FROM A ORDER BY id DESC GROUP BY goods_sn;<br><br>试看看<br><br><font color="#e78608">------解决方案--------------------</font><br>
- SQL code
SELECT count(*) as counter FROM table group by goods_sn order by goods_sn desc limit 10<div class="clear">
</div>
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The difference between counta and count
Nov 20, 2023 am 10:01 AM
The Count function is used to count the number of numbers in a specified range. It ignores text, logical values, and null values, but counts empty cells. The Count function only counts the number of cells that contain actual numbers. The CountA function is used to count the number of non-empty cells in a specified range. It not only counts cells containing actual numbers, but also counts the number of non-empty cells containing text, logical values, and formulas.
Summary of usage differences of MySQL Count function
Nov 29, 2022 pm 04:47 PM
This article introduces to you the usage differences of MySQL’s Count function. The need for statistical data is very easy to encounter in our daily development. MySQL also supports a variety of calculation functions. Next, let’s take a look at the differences between them. , and whether they have some pitfalls.
What is the usage of count function in php
Sep 09, 2021 pm 05:08 PM
The usage of the count function in PHP is: [count(array,mode);], where the parameter array specifies the array to be counted, and the parameter mode specifies the mode of the function.
How to solve the problem of count distinct multiple columns in mysql
Jun 03, 2023 am 10:49 AM
The reproduced test database is as follows: CREATETABLE`test_distinct`(`id`int(11)NOTNULLAUTO_INCREMENT,`a`varchar(50)CHARACTERSETutf8DEFAULTNULL,`b`varchar(50)CHARACTERSETutf8DEFAULTNULL,PRIMARYKEY(`id`))ENGINE= InnoDBAUTO_INCREMENT=1DEFAULTCHARSET=latin1;The test data in the table is as follows. Now we need to count the deduplicated columns of these three columns.
Learn to use the PHP count() function to count the number of array elements
Jun 27, 2023 am 10:37 AM
PHP is a very popular server-side programming language with powerful development capabilities, especially in array operations. Arrays in PHP are widely used to store and manage multiple data items. When operating on an array, it is often necessary to count the number of elements in the array. This can be achieved by using the count() function in PHP. The count() function is PHP's built-in function for counting the number of array elements. When using this function, you only need to pass the array as a parameter of the function
How does java Count count elements in a stream?
May 11, 2023 pm 04:07 PM
Note 1. Count is a terminal operation that can count the total number of elements in the stream. The return value is of long type. 2. count() returns the count of elements in the stream. This is a special case of induction (an induction operation takes a sequence of input elements and combines them into a summary result by repeatedly applying the combining operation). This is a terminal operation and may have consequences and side effects. After a terminal operation is performed, the pipe is considered consumed and cannot be reused. Example // Verify whether there is a string in the list starting with a, and match the first one, that is, return truebooleananyStartsWithA=stringCollection.stream().anyMatch((s
Yum! Brands expands rollout of Voice AI for faster, more accurate drive-thru orders to more Taco Bell locations
Aug 02, 2024 am 09:17 AM
Yum! Brands will expand the rollout of its Voice AI for faster, more accurate drive-thru orders to more Taco Bell locations this year. This follows two years of real-world testing at 100 select US locations across 13 states. The AI relieves human sta
PHP returns an array with elements in reverse order
Mar 21, 2024 am 10:36 AM
This article will explain in detail how PHP returns an array with the elements in reverse order. The editor thinks it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. How to use PHP to return an array with elements in reverse order Introduction In PHP, you can easily return an array with elements in reverse order. This is useful when you need to reverse the order of a string, array, or other data. Methods There are several ways to reverse the order of elements in a PHP array. The simplest method is as follows: $originalArray=[1,2,3,4,5];$reversedArray=array_reverse($originalArray);
