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Why does TIMESTAMPDIFF always return null?

I want to notify users that the server is undergoing maintenance and provide them with the remaining time unti...

From [MySQLdiscussion group] 2023-09-11 23:45:20 0  1  826

mysql: key reference and table reference do not match

Error message: SQLSTATE[42000]: Syntax error or access violation: 1239 Incorrect foreign key definition for 'f...

From [MySQLdiscussion group] 2023-07-18 15:17:02 1  1  826

mysql - thinkphp3.2 csv batch import of tens of thousands of data reports a timeout error. Is there any good way to deal with it?

{Code...} Upload a CSV file, and an error will be reported after execution. Please give me some advice. PS: Yo...

From [MySQLdiscussion group] 2017-05-25 15:08:12 0  1  826

mysql - 這條sql語句為什么加上where就報錯？

這條SQL {代碼...} 加上where就報錯說不存在total_time列，但是我看了明明存在啊

From [MySQLdiscussion group] 2017-04-17 15:57:37 0  3  826

mysql - SQL SERVER 鏈接服務器，"MSDASQL" 無法啟動分布式事務

SQL SERVER 更新數據時，MySQL相應的更新某個表的字段信息，現(xiàn)在遇到一個問題：鏈接服務器"XXX"的 OLE DB 訪問接口 "MSDASQL" 返回了消息 "...

From [MySQLdiscussion group] 2017-04-17 13:47:17 0  1  826

去重復 - 一個mysql多表，多條件查詢去重的問題

有以下這樣的mysql查詢語句，請問怎么去掉重復數據 $sql="select * from "; {代碼...}

From [MySQLdiscussion group] 2017-04-17 13:37:17 0  2  826

node.js - nodejs中，mysql連接——是每次查詢連接一次數據庫，還是啟動node時連接數據庫，關閉時再斷開好呢？

因為我之前用php，都是每次查詢的時候才連接，查詢完了就關閉的，但是用nodejs，我發(fā)現(xiàn)其實壓根沒必要每次查詢都連接-關閉啊，啟動node app的時候連接，然后保持連接，怎么查詢都沒看出有什么不好的地方啊，想問...

From [MySQLdiscussion group] 2017-04-17 12:08:15 0  2  826

MySQL修改最大連接數，沒有my.ini文件，只有my-default，這怎么改呀？

# For advice on how to change settings please see # http://d...

From [MySQLdiscussion group] 2016-11-07 11:09:36 0  1  826

Liquibase and MySql - How to automatically generate id from UUID

I want to create a script for liquibase. When I do an insert in the next script, I want to automatically gener...

From [MySQLdiscussion group] 2024-03-27 00:01:32 0  1  825

MariaDB: Issues with SQL delete using exist clause

I run this select in MariaDB and it works as expected, it's just a select with exists: select*frompred_loan_de...

From [MySQLdiscussion group] 2023-08-30 23:16:01 0  1  825

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From [MySQLdiscussion group] 2017-12-13 16:19:31 0  0  825

Database - Is there a function in mysql to check the data size??

What is the length() function in mysql? Isn't it checking the number of characters: length('Hello') //returns ...

From [MySQLdiscussion group] 2017-06-06 09:51:55 0  1  825

php - How to replace null with the value of other fields in database table

There are two fields A in the data table class. Field B contains all data in field A. Part of field B contains...

From [MySQLdiscussion group] 2017-05-18 10:45:16 0  2  825

MySQL聯(lián)合查詢和簡單查詢究竟如何選擇？

最近看高性能ＭySQl，里面是推薦把聯(lián)合查詢分解為多個簡單的查詢，既然是這樣 那么還要聯(lián)合查詢干嘛？究竟是如何選擇才是效率更高的選擇呢？

From [MySQLdiscussion group] 2017-04-17 16:03:20 0  3  825

PostgreSQL、MySQL、Oracle，查詢的默認排序是怎樣的？

意思是指SELECT語句不加ORDER BY的情況下，是根據什么來排序的？多次查詢此排序是否會變化？謝謝。

From [MySQLdiscussion group] 2016-11-07 11:32:58 0  1  825