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java - mysql query, how to query this

I saw an interview question posted by someone else in the group, =. =, how to query?

From [MySQLdiscussion group] 2017-06-22 11:54:36 0  4  853

MySQL 啟動不了，始終顯示“The server quit without updating PID file”

系統(tǒng)是 centos6.5 安裝的 AMH4.2 ，昨天下午網(wǎng)站始終打不開，于是我想重啟 MySQL ，用 amh 自帶的命令： amh mysql 然后選擇 restart ，但是，那個 MySQL 一直關(guān)不了，等了好...

From [MySQLdiscussion group] 2017-04-17 15:20:15 0  1  852

MySQL 水平拆分之后，自動增長的ID有什么好的解決辦法？

當(dāng)單表的數(shù)據(jù)量過大時，會采用MySQL進行水平拆分，請問原先的自動增長的ID有什么好的解決辦法？

From [MySQLdiscussion group] 2017-04-17 15:04:12 0  5  852

MySQL automatically convert/convert string to number?

Does MySQL automatically convert\convert strings to numeric values? How does this conversion work? '1234'=1234...

From [MySQLdiscussion group] 2023-10-24 08:36:29 0  2  851

Does field order matter in multi-column index in MySQL?

I know the importance of indexes and how join order changes performance. I've read a lot related to multi-colu...

From [MySQLdiscussion group] 2023-10-21 22:05:44 0  2  851

For MySQL, I need a report of rows that deviate more than 1 standard deviation from the mean (expressed as a percentage)

I'm trying to write a MySQL query to count rows that are significantly different from the most common row for ...

From [MySQLdiscussion group] 2023-09-13 22:06:57 0  1  850

MySQL數(shù)據(jù)庫的安全性控制機制如何發(fā)揮作用？

在數(shù)據(jù)庫管理過程中，我們經(jīng)常會為數(shù)據(jù)庫設(shè)置不同的用戶，不同的用戶有著不同的操作數(shù)據(jù)庫和各個表的權(quán)限。 那在MySQL中我們是如何發(fā)揮它的安全性控制機制的？

From [MySQLdiscussion group] 2017-04-17 12:59:10 0  0  850

mysql換MariaDB后，啟動錯誤

yum remove mysql-* -y yum install php-mysql MariaDB-server -y service mysql start 出現(xiàn)錯誤： Starting MySQL. ERROR!...

From [MySQLdiscussion group] 2017-04-17 11:16:17 0  1  850

Safe way to update mysql table entries using dictionary in python (prevent SQL injection)

I'm writing a helper function for my web application that updates the database based on some information obtai...

From [MySQLdiscussion group] 2023-09-08 20:06:07 0  1  849

php - 關(guān)于數(shù)據(jù)庫查詢，既要不影響查詢速度，又能實現(xiàn)分頁的辦法？

有兩個表，一張表存的用戶的用戶ID 及對應(yīng)的考勤ID，另一張表是考勤ID對應(yīng)的考勤數(shù)據(jù)，通過兩表聯(lián)合查詢得到了大致如下的數(shù)據(jù)! 然后通過php數(shù)組處理，將數(shù)據(jù)轉(zhuǎn)變成了大致如下的格式： 但是卻沒辦法分頁了，如若從...

From [MySQLdiscussion group] 2017-04-17 16:52:20 0  1  849

How to change SQL date format to YYYY-MM-DD?

I have a column called "start_date" with data type "DATE". On my database table it appears...

From [MySQLdiscussion group] 2024-01-04 16:42:59 0  1  848

MySQL restart fails in MySQL 8.0.30

The failure occurs when restarting MySQL server version 8.0.30 and so far there is no way to resolve the issue...

From [MySQLdiscussion group] 2023-12-23 20:57:20 0  1  848

Title rewritten to: Issue with rendering BLOB image

Hi I have saved jpg image in BLOB format in mysql. I'm having trouble rendering an image to my view page using...

From [MySQLdiscussion group] 2023-10-31 08:54:55 0  2  848

Using PHP's "Caution: undefined variable", "Caution: undefined index", "Warning: undefined array key" and "Caution: undefined offset"

I'm running a PHP script and continue to receive errors like this: NOTE: Undefined variable: my_variable_name ...

From [MySQLdiscussion group] 2023-08-23 11:45:50 0  2  848

Compare dates in SQL to rows from the same period last year.

I have a database that contains order dates, product codes, and customers, like this example: Index Code Cu...

From [MySQLdiscussion group] 2023-08-02 22:49:52 0  1  848