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MySQL Error 150: Troubleshooting foreign key constraints when creating table

I'm trying to create a table in MySQL with 2 foreign keys that reference primary keys in 2 other tables, but I...

From [MySQLdiscussion group] 2023-10-16 16:59:12 0  1  932

Spring Boot application using MySQL stops suddenly

I have this in application.properties: spring.datasource.url=jdbc:mysql://lin-05779-94506-mysql-primary.server...

From [MySQLdiscussion group] 2023-09-02 10:13:16 0  1  932

mysql optimization - how to explain the problem that mysql primary key is too long and causes secondary indexes to use more space. For example, using uuid as the primary key causes this problem

I read Meituan's article: http://tech.meituan.com/MT_Le... I thought of it, but I don't quite understand the o...

From [MySQLdiscussion group] 2017-05-18 10:53:33 0  1  932

數(shù)據(jù)庫(kù) - MySQL中如何把多張表格中的相同種類的數(shù)據(jù)合在同一列顯示出來(lái)？

題目中給出了四張表： 圖中S代表供貨商，P代表商品，J代表商業(yè)項(xiàng)目，SP代表三者的聯(lián)系（和這道小題暫時(shí)無(wú)關(guān)），現(xiàn)在需要在同一列顯示出供貨商、商品、商業(yè)項(xiàng)目所在的所有城市（city項(xiàng)）且不重復(fù)顯示，請(qǐng)問(wèn)有什么...

From [MySQLdiscussion group] 2017-04-17 13:27:01 0  1  932

centos6.5 - mysql 連接10060

網(wǎng)上各種找資料 仙子愚昧沒(méi)有解決問(wèn)題 首先我用的是centOS6.5lamp安裝的是wdcp的RPM包安裝然后快速創(chuàng)建mysql數(shù)據(jù)庫(kù)及用戶 數(shù)據(jù)庫(kù)也確實(shí)創(chuàng)建成功 然后使用Navicat連接 然后 執(zhí)行連接測(cè)試 第一次玩...

From [MySQLdiscussion group] 2017-04-17 15:14:29 0  1  929

mysql - 如何用sql語(yǔ)句，判斷數(shù)據(jù)庫(kù)中某字段的內(nèi)容，包含于某字符串？

如何用sql語(yǔ)句，判斷數(shù)據(jù)庫(kù)中某字段的內(nèi)容，包含于某字符串？也就是屬于某字符串的子串？ 比如數(shù)據(jù)庫(kù)中某字段內(nèi)容為“張三”，某字符串是“張三是好人”，則符合條件， 如果數(shù)據(jù)庫(kù)中某字段內(nèi)容為“張三”，某字符串是“...

From [MySQLdiscussion group] 2017-04-17 11:06:11 0  5  929

Efficiently find the last timestamp within a given time range

The problem is with a hypothetical online store; I'll simplify the data for my specific problem. Suppose there...

From [MySQLdiscussion group] 2024-03-22 13:22:08 0  1  928

How to pass parameters to MySQL query callback function in Node.js

I'm trying to figure out the correct way to pass custom data to a query call so it's available in the callback...

From [MySQLdiscussion group] 2023-08-22 15:44:32 0  2  928

Mysql table index problem help

I encountered several problems when creating a data table index. Please help me: 1. UPDATE table SET version =...

From [MySQLdiscussion group] 2017-06-10 09:49:40 0  2  928

mysql新建字段時(shí) timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' 報(bào)錯(cuò)

這是為什么，網(wǎng)上大家都可以，為什么就我不行。。。我報(bào)錯(cuò)是Invalid default value for 'sent_time'

From [MySQLdiscussion group] 2017-04-17 14:59:41 0  4  928

node.js - express執(zhí)行mysql刪除語(yǔ)句后，刷新頁(yè)面不更新

mysql.query('delete from cm_company where com_id = ' + com_id,function(err,rows, fields){if(err) throw err;res...

From [MySQLdiscussion group] 2017-04-17 14:58:01 0  2  927

c# - mysql select逐條輸出大量數(shù)據(jù)時(shí)的鎖表問(wèn)題

代碼如圖mysql 讀取目前大約2w條數(shù)據(jù)表items輸出信息，如果同時(shí)有其他程序操作這個(gè)表，那items表就會(huì)卡死 一直到這個(gè)程序執(zhí)行完畢，這個(gè)表才會(huì)正常，是什么情況呢，同樣的程序用在低配阿里云上的mysql就沒(méi)問(wèn)題，...

From [MySQLdiscussion group] 2017-04-17 16:09:49 0  0  926

MySQL 使用 group by 之后然后 IFNULL(COUNT(*),0) 為什么還是會(huì)獲得 null

如題 MySQL 使用 group by 之后然后 IFNULL(COUNT(*),0) 為什么還是會(huì)獲得 null。 {代碼...} 結(jié)果為 null

From [MySQLdiscussion group] 2017-04-17 15:16:08 0  1  926

What operations will cause mysql's binlog_size to quickly increase?

The binlog_size of mysql increases rapidly. What is the reason?

From [MySQLdiscussion group] 2017-05-18 10:49:03 0  3  925

MySQL 的性能指標(biāo)在什么條件下是正常的呢？

我在網(wǎng)上找了很久，很多 MySQL 性能測(cè)試都沒(méi)有提到他們使用的硬件配置，動(dòng)不動(dòng)都是讀 1.5w 每秒，寫(xiě) 4000 每秒的，平均響應(yīng) 10ms 以內(nèi)。我很好奇這到底什么級(jí)別的機(jī)器有這種性能。我在自己的機(jī)器上測(cè)，硬件是 ...

From [MySQLdiscussion group] 2016-11-09 11:05:33 0  1  925