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The optimization problem of group by sentence in mysql and how to find the train of thought
I want to optimize a sentence about group by. I don t know where to start. I want to find a train of thought .
SELECT
adv_id,
network_id,
SUM(re_click) AS clk,
SUM(deny_click) AS dny_clk,
SUM(re_conver) AS re_ins,
SUM(mat_conver) AS mat_ins,
SUM(def_...
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Please help me convert this native SQL statement into TP5 thank you!
ask God to help me translate this native SQL statement into TP5 thank you! It is Db:: ( name )-> this kind of chained operation select a.id, a.titlerect a. Createwriting time as answer_count from fa_question a. Isometric solvepaper count (b.qid) as ...
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Request interface Times wrong The API configuration file does not exist.
I have a vegetable chicken at the front end. Recently, there is a new demand for the company s project, which has been maintained by others before.
the front end uses a framework built by pHp and uses the memcached plug-in. After the project runs,
,...
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There is a problem of read repetition in LOCK TABLES auto_table WRITE;.
The basic logic of the program is as follows: execute "LOCK TABLES auto_table WRITE "; then "select ID from auto_table; then update ID+1 " UPDATE auto_table set ID=ID+1 "; finally execute " UNLOCK TABLES "
but this logic occurs when two users r...
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The mysql stored procedure is called in PHP, and the rest of the code is executed, but the stored procedure is not executed.
php calls the stored procedure, and there is other execution code before and after the stored procedure, in the same transaction, but the code before and after the stored procedure is executed, but the code in the stored procedure is not executed. What i...
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Php queries all the data in table an of the mysql database, and then looks up the table B that belongs to table A with the most data.
this is a function of asking and answering questions questions asked by users in Table A questions answered by users in Table B
Table An is the only question corresponding to ID, Table B PID corresponds to Table An ID users answer which question PI...
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Php memory problem
the code is as follows
$num = M ( log )-> where ( "date_format (create_time, %Y-%m ) = $date ")-> count ( id );
for($i = 0; ($i+5000)<=20000;$i += 5000){
$datas = M( credit_log )->where("date_format(create_time, %...
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How to change the key name to a field comment when tp5 acquires data
for example: I have a table T1 in which there is a comment named name name field select name from T1 that gets array ().
[0]=array(
name => 123
),
[1]=array(
name => 236
)
)
how to change the above name to name ...
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The browser reported an error Access denied for user 'root'@'localhost' (using password:NO
browser error: SQLSTATE [HY000] [1045] Access denied for user root @ localhost (using password: NO) I successfully connected to the database with navicat, the user name is root, password is the password set when installing mysql, and the framework...
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How to record likes and display likes and nos in youtube?
how do you design database fields like youtube pages that show whether you have pressed like or dislike? And go to the database to judge when the user arrives at the page?
whether the design idea is like this
Post table id picroute likeusers dislik...
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About the execution of load_file () as NULL? in mysql
when learning the knowledge of mysql penetration, the attempt to read the file on disk D with sql statement failed as follows:
root@host
after testing, the value of secure-file-priv is not valid even if it is empty.
mysql,apache is running normal...
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Mysql inserts the following values. Why do you prompt for duplicate inserts?
backend PHP sends the submitted data to Filter submit data: "> < script > alert ( 1 ) < script >
Filter (equivalent to conversion via htmlspecialchars): "> < script > alert ( 1 ) < script >
name varchar (255) description text
prom...
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How does PHP remove quotation marks on both sides of the array and return the array
as shown in the figure, how to get to the quotation marks on both sides of the queue and return the data in array format
...
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After the order exceeds a certain time, the user does not confirm the receipt of the goods, which requires the system to automatically complete the confirmation operation, that is, to change the status of the order. Do you have any good ideas?
after the order exceeds a certain time, the user does not confirm the receipt, so the system needs to automatically complete the confirmation operation, that is, to change the status of the order. Do you have any good ideas?
I have seen before that so...
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On the problem of concurrency
php backend needs to insert records into the mysql database table. The id of this table is primary key but not self-growing, which needs to be calculated by some rules. For example, if you first check that there are N records created that day, then set t...
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Unlimited distribution, top-to-bottom settlement of distribution commission
< H2 > hierarchical relationship table (processed using baum) < H2 >
when the distributor buys, the performance automatically adds up to all his superiors monthly performance
the settlement method determines whether the minimum settlement ra...
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How to access the php file of the Wampserver server deployed by Aliyun through ip?
it is necessary to build a php integrated development environment on this machine. Whether it can be deployed in the cloud can be found directly through the public network ip!
...
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Mysql query statement
A
a_id a_title a_key a_desc a_pid
1 A A A 1
B
b_id b_title b_key b_desc b_pid
1 b 2
C
c_id c_title c_key c_desc c_pid
1
$title= Ctitile || ...
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How does php store session in a database?
SessionHandler.php the contents of the file are as follows
<?php
namespace Dry Base;
class SessionHandler{
private $pdo = null;
private $lifeTime = 1440;
public function __construct($pdo)
{
$this->pdo = $pdo;
...
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Php uses curl, and the counterpart is also php. How can I get it?
I wrote an api hypothesis called sql.php myself.
I am in another sql-test.php
$data = array(
"errno" => 1 ,
"errstr" => 2 ,
"errfile" => 3 ,
"errline" => 4
);
$data_string = js...
