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Why is '+' not understood by Python sets?
...ts don't have an implementation for the + operator.
You can use | for set union and & for set intersection.
Sets do implement - as set difference. You can also use ^ for symmetric set difference (i.e., it will return a new set with only the objects that appear in one set but do not appear in b...
Schrödingers MySQL table: exists, yet it does not
...or if you have backups, try the following:
Delete all schemas (excluding mysql)
shut down the database
Make sure that all folders in your data directory have been removed properly (again, excluding mysql)
delete ibdata and log files
restart the database. It should recreate the tablespace and logs ...
搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...着副本集的问题来看吧！
副本集故障转移，主节点是如何选举的？能否手动干涉下架某一台主节点。
官方说副本集数量最好是奇数，为什么？
mongodb副本集是如何同步的？如果同步不及时会出现什么情况？会不会出现不一致...
Sql Server string to date conversion
...tedDate,
100 as FormatValue,
'mon dd yyyy hh:miAM (or PM)' as OutputFormat
union all
select @d,convert(varchar,@d,101),101,'mm/dd/yy'
union all
select @d,convert(varchar,@d,102),102,'yy.mm.dd'
union all
select @d,convert(varchar,@d,103),103,'dd/mm/yy'
union all
select @d,convert(varchar,@d,104),104,...
How to declare a type as nullable in TypeScript?
...wever, salary = undefined; will work just fine in this case. Solution: use Union i.e. '|'
– Ankur Nigam
Apr 21 at 6:19
...
App Inventor 2 中文网VIP专享内容 · App Inventor 2 中文网
... 实现上传文件到服务器全方案总结
【MySQL】App Inventor 2 如何连接MySQL数据库（阿里云数据库）
[【云图片】利用网络微数据库实现图片上传至云端及从云端下载]
[【AI云识图】利用云API进行AI识图]
【OCR识别】App Inventor 2 OCR ...
Downloading MySQL dump from command line
...tion to a more noob-friendly service, I need to download the contents of a MySQL database. Is there a way I can do this from the command line?
...
How to export a mysql database using Command Prompt?
...
First check if your command line recognizes mysql command. If not go to command & type in:
set path=c:\wamp\bin\mysql\mysql5.1.36\bin
Then use this command to export your database:
mysqldump -u YourUser -p YourDatabaseName > wantedsqlfile.sql
You will then...
How do I find the MySQL my.cnf location
Is there a MySQL command to locate the my.cnf configuration file, similar to how PHP's phpinfo() locates its php.ini ?
...
ORACLE 启动提示 内存不足 OUTOF MEMORY - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...ore.wmem_max=262144
在ORACEL 用户下
输入 su - root
敲入密码
输入 gedit /etc/sysctl.conf
修改为
#kernel.shmall =2097152
kernel.shmall = 4194304
kernel.shmmax =2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_por...