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Format number to 2 decimal places
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You want to use the TRUNCATE command.
https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html#function_truncate
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dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
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Since dplyr 0.8 group_by gained the .drop argument that does just what you asked for:
df = data.frame(a=rep(1:3,4), b=rep(1:2,6))
df$b = factor(df$b, levels=1:3)
df %>%
group_by(b, .drop=FALSE) %>%
summarise(count_a=length(a)...
Imply bit with constant 1 or 0 in SQL Server
Is it possible to express 1 or 0 as a bit when used as a field value in a select statement?
8 Answers
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How to read the content of a file to a string in C?
...-codes for fseek, ftell and fread. (omitted for clarity).
char * buffer = 0;
long length;
FILE * f = fopen (filename, "rb");
if (f)
{
fseek (f, 0, SEEK_END);
length = ftell (f);
fseek (f, 0, SEEK_SET);
buffer = malloc (length);
if (buffer)
{
fread (buffer, 1, length, f);
}
fclo...
Generate a Hash from string in Javascript
...perty(String.prototype, 'hashCode', {
value: function() {
var hash = 0, i, chr;
for (i = 0; i < this.length; i++) {
chr = this.charCodeAt(i);
hash = ((hash << 5) - hash) + chr;
hash |= 0; // Convert to 32bit integer
}
return hash;
}
});
Source:
htt...
How to initialize array to 0 in C?
...are automatically initialized to zero. If you have simply
char ZEROARRAY[1024];
at global scope it will be all zeros at runtime. But actually there is a shorthand syntax if you had a local array. If an array is partially initialized, elements that are not initialized receive the value 0 of the ap...
css3 drop shadow under another div, z-index not working [duplicate]
... TylerH
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answered Jul 15 '10 at 19:10
gearsdigitalgearsdigital
12k66 ...
net use命令使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...建立新的网络连接1. 连接局域网中共享的目录：net use 0.0.0.0 dir "your password" User:username PERSISTENT...net use命令用于建立新的网络连接
1. 连接局域网中共享的目录：
net use \\0.0.0.0\dir "your password" /User:username /PERSISTENT:YES
net use x...
Mac版AxureRP_PRO7.0.0.3173 带注册码完美简体中文破解版 - 软件下载 - 清...
Mac版AxureRP_PRO7.0.0.3173 带注册码完美简体中文破解版AxureRP MacAxure RP 为一款办公自动化帮助工具，可以帮你快速地制作线框图，流程图，定义和创建HTML模板及MS WORD文件格式等。Axure RP 功能包括 Axure RP 为一款办公自动化帮助工具...
Common MySQL fields and their appropriate data types
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answered Dec 10 '08 at 0:57
da5idda5id
8,83288 gold badges3636 silver badges5050 bronze badges
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