今天碰到一個問題:往mysql中插入資料,兩條資料明明不一樣,插入時卻提示主鍵衝突,後來弄了半天才發現是建索引的時候,建成了unique索引,恰好建索引時只用了該列值的前12個字元,所以雖然插入時值雖然不一樣,但是索引值(取前12個字元)卻有可能一樣,這時候也會導致插入失敗,提示鍵衝突解決辦法1.刪除索引DROP INDEX index_name ON talbe_name2.重新建立非unique的索引mysql 某列上增加索引 ALTER TABLE tableName ADD INDEX
MySQL Error Number 1005Can’t create table ‘.\mydb\#sql-328_45.frm’ (errno: 150)If you get this error while trying to create a foreign key, it can be pretty frustrating. The error about not being able to create a .frm file seems like it would be some
查看當前編碼情況:mysql> show variables like \'%character%\'; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_
Since a stored procedure doesn't know ahead of time how many results will be returned, the client needs to support reading any multiple of results. Therefore, if the server sees that you don't have CLIENT_MULTI_RESULTS set, it will give an error
1、顯示資料庫列表。 show databases; 剛開始時才兩個資料庫:mysql和test。mysql庫很重要它裡面有MYSQL的系統資訊,我們改密碼和新增使用者,實際上就是用這個庫進行操作。 2、顯示庫中的資料表: use anying; //開啟庫,學過FOXBASE的一定不會陌生吧 show tables; 3、顯示資料表的結構: describe 表名; 4、建庫: create database 庫名; 5、建表: use 庫名;
mysql資料庫遠端存取設定方法1、修改localhost更改 "mysql" 資料庫裡的 "user" 表裡的 "host" 項,從"localhost"改成"%" mysql>use mysql; mysql>update user set host = '%' where user = 'root'; mysql>select host, user from user;mysql>FLUSH
現在來考慮MySQL在Ubuntu上的自動部署,有幾個問題需要解決:第一,檢查是否安裝過了MySQL第二,安裝過程中避免互動式輸入root密碼在tool.sh中添加函數檢查dpkg包。#$1 means the full name of dpkg#return 1 if dpkg is installed (found 'ii dpkg-name' in the returned string)#otherwise return 0function hasDpkg { r=`dpkg