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Best way to check for “empty or null value”
What is best way to check if value is null or empty string in Postgres sql statements?
10 Answers
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how to convert a string to date in mysql?
I have a string column which acts as a date and I want to select it as a date .
5 Answers
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开源跳板机(堡垒机)Jumpserver v2.0.0 使用说明 - 开源 & Github - 清泛网 ...
...e 可以进入二级菜单批量在主机执行命令，根据提示输入IP，支持通配符，可以逗号分隔，下面输入执行的命令
注意：报错可能提示没有目录权限，添加该目录并修改权限
# mkdir –p /opt/jumpserver/logs/exec_cmds
# chmod 777 /opt/jumpse...
Apache .htaccess 禁止访问某目录方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...代码。
order allow,deny
deny from all
(可以把all换成某一ip地址)最简单方法，在所要禁止的目录中的.htaccess文件中添加一下两行代码。
order allow,deny
deny from all
(可以把all换成某一ip地址)
【.htaccess简介】
.htaccess文件，又叫分...
What is the best way to auto-generate INSERT statements for a SQL Server table?
..._Type varchar(128),
@Actual_Values varchar(8000), --This is the string that will be finally executed to generate INSERT statements
@IDN varchar(128) --Will contain the IDENTITY column's name in the table
--Variable Initialization
SET @IDN = ''
SET @Column_ID = 0
SET @Column...
Is there any way to post events to Google Analytics via server-side API? [closed]
...ublic class GoogleAnalyticsApi
{
public static void TrackEvent(string type, string category,
string action, string label, string value)
{
ASCIIEncoding encoding = new ASCIIEncoding();
string postData =
"v=1&tid=UX-XXXXX...
How can I run MongoDB as a Windows service?
...he following error: Cannot open MongoDB service
on computer '.'.
At line:1 char:1
+ Start-Service MongoDB
+ ~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : OpenError: (System.ServiceProcess.ServiceController:ServiceController) [Start-Service],
ServiceCommandException
+ FullyQualifiedError...
What characters are allowed in an email address?
...cters are allowed with restrictions (they are only allowed inside a quoted string, as described in the paragraph below, and in addition, a backslash or double-quote must be preceded by a backslash);
comments are allowed with parentheses at either end of the local-part; e.g. john.smith(comment)@exa...
UDP vs TCP, how much faster is it? [closed]
...gh, a missing or 'rearranged' packet is critical. You'd have to write some extra code to run on top of UDP to retry if things got missed, and enforce correct order. This would add a small bit of overhead in certain places.
Thankfully, some very very smart people have done this, and they called it T...
Fixing “Lock wait timeout exceeded; try restarting transaction” for a 'stuck" Mysql table?
... query is stuck, there is a problem somewhere :
in your query (misplaced char, cartesian product, ...)
very numerous records to edit
complex joins or tests (MD5, substrings, LIKE %...%, etc.)
data structure problem
foreign key model (chain/loop locking)
misindexed data
As @syedrakib said, it wor...