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oracle group 取每组第一条 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...code_id =1;
这里涉及到的over()是oracle的分析函数。
参考sql reference文档：
Analytic functions compute an aggregate value based on a group of rows. They differ from aggregate functions in that they return multiple rows for each group.
Analytic functions are the last set o...
MongoDB仿关系型数据库Group聚合例子 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...x仿关系型数据库例子，通过BsonJavaScript脚本实现。相当的SQL：select * from GroupDemo a right join (select userName,max(date) maxdate from GroupDemo group by userName) b on a date=b maxdate
namespace MongoGroupDemo
{
class Program
{
private static string Mongo...
VBA读写UTF8文本文件，VBA生成UTF-8无BOM格式的文件 - 更多技术 - 清泛网 -...
...ect("ADODB.Stream")
nameto = "指定一个文件全路径 如：“D:\1.sql”"
With WriteStream
.Open
.Charset = "UTF-8"
.Type = 2 'adTypeText （文本）
.WriteText ("insert into name values('1','2','3')")
.Position = 3
End With
With BinSt
....
Linq 多字段排序，二次排序 - .NET(C#) - 清泛IT论坛，有思想、有深度
Linq：ordered = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );
类似SQL：select * from t1 order by f1 desc ,f2 asc
这种写法里 OrderBy、ThenBy 是升序的，OrderByDescending、ThenByDescending 是降序的。
本地SQLite实现注册登录功能 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
建表的SQL语句如下：
CREATE TABLE user(username TEXT PRIMARY KEY, password TEXT);
--------------
最后提一下日志调试功能：
上面其实是用户密码信息，在日志控制台中能够输出便于调试查看。
Filter rows which contain a certain string
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note that this does not work when the object is a tbl_sql as grepl does not translate to sql.
– David LeBauer
Aug 11 '15 at 17:17
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count(*) vs count(column-name) - which is more correct? [duplicate]
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there is a performance difference (at least in MySQL) as well (see my answer).
– nickf
Jun 9 '10 at 7:51
1
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Get the first element of each tuple in a list in Python [duplicate]
An SQL query gives me a list of tuples, like this:
5 Answers
5
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How to highlight text using javascript
...t-search or Lucene], then you can escape every character with \ and add an SQL-escape-statement, that way you'll find special characters that are LIKE-expressions.
e.g.
WHERE textField LIKE CONCAT('%', @query, '%') ESCAPE '\'
and the value of @query is not '%completed%' but '%\c\o\m\p\l\e\t\e\d%'
(...
Convert String[] to comma separated string in java
...in(names,"','") + "'"; this would give you the Single quotes needed by the SQL request.
– haysclark
Feb 26 '16 at 4:22
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