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Mysql returns some records as empty in date field because date has multiple formats

I am trying to analyze order_date column and the column has multiple date formats and I want to convert all th...

From [MySQLdiscussion group] 2024-04-06 13:29:40 0  1  946

The problem of Amazon RDS being unable to execute the SET GLOBAL command still exists

I'm using AmazonRDS for mysql database. I want to run some SET commands like: SETGLOBALgroup_concat_max_len=18...

From [MySQLdiscussion group] 2023-08-24 14:42:31 0  2  946

Reasons for Chinese garbled characters in MySQL database

This is the statement for creating a table in my database. This is the garbled picture of my database query. W...

From [MySQLdiscussion group] 2017-05-18 10:54:52 0  7  946

How to implement numeric value length limit in Laravel 10?

Is this the correct way to validate a numeric value in a tinyint(4) field? This is the command I'm currently u...

From [MySQLdiscussion group] 2023-08-09 14:49:31 0  1  945

MySQL deduplication, why can only a few hundred or dozens of duplicate data be removed each time, when there are obviously hundreds of thousands of duplicate data?

Requirement: Delete the items with the same primaryid and drugname in DRUG, and keep the smallest row of drug_...

From [MySQLdiscussion group] 2022-09-05 14:49:26 0  0  945

mysql - 為什么limit前面加上order by 索引查詢性能會(huì)更好？

為什么limit前面加上order by 索引查詢性能會(huì)更好？SELECT * FROM sys_client LIMIT 100000,10 耗時(shí)：0.0004而：SELECT * FROM sys_client OR...

From [MySQLdiscussion group] 2017-04-17 16:45:33 0  5  945

Mysql樂觀鎖悲觀鎖行鎖表鎖是從哪幾個(gè)方面來分類的？比如說表鎖也可是樂觀鎖，也可以是悲觀鎖嗎？

如題。Mysql樂觀鎖悲觀鎖行鎖表鎖是從哪幾個(gè)方面來分類的？比如說表鎖也可是樂觀鎖，也可以是悲觀鎖嗎？

From [MySQLdiscussion group] 2017-04-17 13:24:59 0  1  945

Sequelize CLI migration error: Cannot access property of undefined (specifically 'details')

I'm running npxSequelize-clidb:migrate to create a table in the database and the following message is returned...

From [MySQLdiscussion group] 2023-11-04 23:07:03 0  2  944

golang - go-sql-driver/mysql for rows.Next()的性能問題

1.當(dāng)查詢出來的記錄過萬時(shí)，遍歷Rows的時(shí)間過長(zhǎng)，達(dá)到1分鐘甚至更多 程序代碼： {代碼...}

From [MySQLdiscussion group] 2017-04-17 15:19:56 0  2  944

windows10配置mysql失敗

各位大神看看下面是什么錯(cuò)誤以下是mysql啟動(dòng)日志： mysqld: Can't change dir to 'D:\soft\mysql\mysql-5.7.10\data\' (Errcode: 2 - No suc...

From [MySQLdiscussion group] 2017-04-17 13:32:12 0  2  944

mysql - 5星評(píng)分系統(tǒng)數(shù)據(jù)庫表結(jié)構(gòu)如何設(shè)計(jì)更高效？

我們常見給產(chǎn)品進(jìn)行5星評(píng)價(jià)的系統(tǒng)，我初步的構(gòu)想如下， {代碼...} 如何修改更高效？ 例如， 當(dāng)數(shù)據(jù)上萬時(shí)，把平均值存儲(chǔ)下來，而不是每次都進(jìn)行計(jì)算？ 在games表中進(jìn)行適當(dāng)?shù)娜哂啵黾右粋€(gè)評(píng)論加1？ 我現(xiàn)在有點(diǎn)...

From [MySQLdiscussion group] 2017-04-17 11:08:33 0  1  944

mysql - SQL語句使用聚合函數(shù)之后有些字段沒有分組顯示,那它顯示的規(guī)則是什么?

{代碼...} hk.backMoney這個(gè)字段會(huì)顯示的是最大的hk.backTime對(duì)應(yīng)的數(shù)據(jù)嗎? 多個(gè)字段使用聚合函數(shù)之后,如果沒有對(duì)其它的字段進(jìn)行分組,這時(shí)候只有一條,其他字段是怎么取的.?

From [MySQLdiscussion group] 2017-04-17 13:44:49 0  1  943

Does it mean that each row and column does not include fields?

From [MySQLdiscussion group] 2017-11-24 15:54:57 0  0  942

【求大神】現(xiàn)在有1000個(gè)string與一個(gè)MYSQL字典，查詢這1000個(gè)string在MYSQL中的id并輸出結(jié)果

1.這是需要查詢string的示例（txt文件）vivo X5S LCHE-TL00HG621-TL00vivo Y51AKIW-AL10Samsung SM-G9200XiaoMi MI PADSamsung SM-G...

From [MySQLdiscussion group] 2017-04-17 15:24:41 0  2  942

What is the functional difference between the update operation and the replacement operation when MySQL primary key conflicts (as shown in the figure)

(www.sf.gg) is China's leading developer technology community. We hope to provide a pure, high-quality technic...

From [MySQLdiscussion group] 2017-06-07 09:25:03 0  2  941