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Mysql語句，on，where，having..區(qū)別

提出這個問題很多人會覺得這太基礎(chǔ)了..on為join服務(wù)，where為物理表服務(wù)，having可以為別名服務(wù).可惜我要的不是這樣的答案我在想一個問題，為什么mysql官方要出三個篩選條件關(guān)鍵字？即一個關(guān)鍵字不能解決嗎？（...

From [MySQLdiscussion group] 2017-04-17 13:59:07 0  7  730

mysql - sql怎么隨機取50條數(shù)據(jù)?

MySQL從一張表怎么隨機取50條數(shù)據(jù)?

From [MySQLdiscussion group] 2017-04-17 13:40:55 0  7  730

MySQL #1064 ALTER添加多個外鍵約束

see here also: http://stackoverflow.com/questions/13...I've checked it out for 4 times and didn't find any syn...

From [MySQLdiscussion group] 2017-04-17 11:03:51 0  0  730

Do the flat files need to have the same json format?

You can see the different responses from the API explained: In the screenshot shared above, I compared two dif...

From [MySQLdiscussion group] 2023-09-07 09:19:43 0  1  729

"SQL query for valid records within a specific date range"

I am working on attendance control. Check-in and check-out are two different records in the table. It is possi...

From [MySQLdiscussion group] 2023-08-31 13:58:14 0  2  729

Mariadb troubleshooting using UNION's CREATE TABLE SELECT

I'm working on a PHP script that contains six UNION SELECTs, and within the script this command runs just fine...

From [MySQLdiscussion group] 2023-08-02 11:25:48 0  1  729

macbook - mac下為什么不能使用mysql命令

如題

From [MySQLdiscussion group] 2017-04-17 16:25:04 0  1  729

電商 - 如何用 mysql 定時任務(wù) 處理訂單超時 庫存釋放的問題？

現(xiàn)在我需要下訂單15分鐘 將訂單改變狀態(tài)為 無效單 ，并且釋放庫存，更新對應(yīng)的庫存表 假設(shè)我的訂單表叫 order_form 庫存表 叫 stock 小弟對Mysql的操作不太熟，麻煩知道的寫下 謝謝

From [MySQLdiscussion group] 2017-04-17 15:07:37 0  2  729

mysql 怎么修改用戶名?

大家好,我是看教程學(xué)習(xí)的mysql,其實一般的增刪改查導(dǎo)入導(dǎo)出我都會了,不信你看: {代碼...} 但是我不會改服務(wù)器端口什么,也不會改用戶名..因為我看的教程都沒教,請問怎么改??我看了三套教程,都沒教..真的..謝謝...

From [MySQLdiscussion group] 2017-04-17 15:06:35 0  1  729

mysql - sql中update語句 and 和直接where語句的區(qū)別是什么？

現(xiàn)在我有如下兩條sql請問有什么區(qū)別？ update customer set moeny = 100 and balance >= 100 udpate customer set money =100 w...

From [MySQLdiscussion group] 2017-04-17 13:47:50 0  3  729

MySQL - LIMIT & IN/ALL/ANY/SOME subquery is not currently supported in this version of MySQL

This is the php code I am using $Last_Video=$db->fetch_all('SELECTVID,thumbFROMvideoWHEREVIDIN(SELECTVIDFRO...

From [MySQLdiscussion group] 2023-10-16 22:44:50 0  2  728

Company name registration form

FYI, new to coding, self taught, take it easy... I have a signup form that I use to create new SQL tables. The...

From [MySQLdiscussion group] 2023-09-05 19:05:36 0  1  728

Using Docker to run Mariadb but the database is empty

So I can access running mysql inside the virtual machine using: mysql -h (mariadb's IP) -u (user) -p (password...

From [MySQLdiscussion group] 2023-08-31 14:40:53 0  1  728

How to use variables in SQL statements in Python?

I have the following Python code: cursor.execute("INSERTINTOtableVALUESvar1,var2,var3,") where var1 ...

From [MySQLdiscussion group] 2023-08-20 17:35:10 0  2  728

MySQL部署單機多實例無法初始化數(shù)據(jù)庫

嘗試在單機上部署mysql多實例，但是無法初始化數(shù)據(jù)庫，文件目錄如下： {代碼...} 嘗試執(zhí)行mysqld --defaults-file=/mysql_multi/3306/my.cnf --initialize-i...

From [MySQLdiscussion group] 2017-04-17 16:31:00 0  1  728