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Find the object corresponding to the key value in MySQL JSON: How to implement it

I'm trying to find a way to search a JSON object and get a specific key, but search for another key. Here is a...

From [MySQLdiscussion group] 2023-10-30 13:42:27 0  1  1027

How can PHP display SQL query results through an array? There are multiple query results, as shown in the figure. I want echo in forsearch

How can PHP display SQL query results through an array? There are multiple query results, as shown in the figu...

From [MySQLdiscussion group] 2020-10-19 22:58:03 0  1  1027

Please tell me about the high burst operation of the same data.

A table user data is as follows: idnamepassnum1aaa12345602bbb12345633ccc1234564. There is a php file. When exe...

From [MySQLdiscussion group] 2020-10-18 14:25:14 0  1  1027

Embracing UTF-8 from start to finish

I'm setting up a new server and want full UTF-8 support in my web application. I've tried this in the past on ...

From [MySQLdiscussion group] 2023-10-15 12:36:31 0  2  1025

mysql storage json error

Recently, I have been using MySQL's json storage format, and a very strange problem has occurred. INSERT INTO ...

From [MySQLdiscussion group] 2017-06-06 09:52:13 0  1  1025

mysql - 執(zhí)行大量SQL進(jìn)行批量插入或更新，開(kāi)啟事務(wù)執(zhí)行會(huì)提高執(zhí)行速度還是降低執(zhí)行速度？

執(zhí)行大量SQL進(jìn)行批量插入或更新，開(kāi)啟事務(wù)執(zhí)行會(huì)提高執(zhí)行速度還是降低執(zhí)行速度？

From [MySQLdiscussion group] 2017-04-17 15:42:32 0  1  1025

MySQL update select 速度緩慢

有如下兩個(gè)表，引擎都為MyISAM a，表a中包含150W條數(shù)據(jù) b，表b中包含50W條數(shù)據(jù) 其中表a的iplong為ip地址的long類型，如果a.iplong >= b.ip1 and a.iplong...

From [MySQLdiscussion group] 2017-04-17 11:44:10 0  4  1025

Online registration for courses and exam functions

Publish courses in the background -> Users can pay to register for multiple courses to study -> After us...

From [MySQLdiscussion group] 2022-09-02 09:53:21 0  1  1024

Mysql: "The connection attempt failed because the connecting party did not respond properly after a period of time"

I have a project using AspNetMVC4.5.2 and Mysql database. For a few days, my project started getting errors fr...

From [MySQLdiscussion group] 2023-09-21 14:59:55 0  1  1023

How to update the value of "last_dt" column when using "UPDATE" or "INSERT IGNORE INTO ~ ON DUPLICATE KEY UPDATE ~" statements

The last_dt column is the date the data was last changed. It is managed differently than inserted dates. Inser...

From [MySQLdiscussion group] 2023-09-16 13:54:41 0  1  1023

mysql查詢優(yōu)化

mysql查詢，濾除某一字段packageId（不是主鍵） = num的結(jié)果，是直接使用not in 好還是查詢完畢遍歷結(jié)果集的時(shí)候?yàn)V除好。查詢完后無(wú)論怎樣都需要遍歷結(jié)果集。

From [MySQLdiscussion group] 2016-11-10 15:44:07 0  2  1023

mysql optimization - how to prevent full table updates in mysql

MySQL has a safe mode, but sometimes in business, you need to update multiple rows of records, but you want to...

From [MySQLdiscussion group] 2017-05-18 10:55:07 0  1  1022

為什么刪除了主鍵primary之后唯一約束會(huì)變成主鍵約束？

為什么刪除了主鍵primary之后唯一約束會(huì)變成主鍵約束？還有為什么刪除不了？必須要有約束們

From [MySQLdiscussion group] 2016-12-21 17:47:37 0  2  1022

mysql optimization - mysql innodb and myisam lock

Will innodb insert be locked? If it's locked, what's the point? In innodb, update and delete will implicitly a...

From [MySQLdiscussion group] 2017-05-24 11:34:38 0  1  1019

How to calculate the time interval between Java date and Mysql date type?

There is a field in the data table that stores the date type of MySQL. Every time it is read out, it is necess...

From [MySQLdiscussion group] 2017-06-20 10:05:43 0  1  1018