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Difference between natural join and inner join
...+----------+
The INNER JOIN of TableA and TableB on Column1 will return
SELECT * FROM TableA AS a INNER JOIN TableB AS b USING (Column1);
SELECT * FROM TableA AS a INNER JOIN TableB AS b ON a.Column1 = b.Column1;
+------------+-----------+---------------------+
| a.Column1 | a.Column2 | ...
How do I kill all the processes in Mysql “show processlist”?
...peration saves time. Do it in MySql itself:
Run these commands
mysql> select concat('KILL ',id,';') from information_schema.processlist
where user='root' and time > 200 into outfile '/tmp/a.txt';
mysql> source /tmp/a.txt;
Reference
---------edit------------
if you do not want to sto...
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
...irm this - I just updated a query with 4 joins on a 168,000 row database. Selecting just the first 100 rows with a SQL_CALC_FOUND_ROWS took over 20 seconds; using a separate COUNT(*) query took under 5 seconds (for both count + results queries).
– Sam Dufel
Ju...
程序员才能听得懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...子出去约会了，一群SX程序员还在加班。。。
33、问：如何生成一个随机的字符串？答：让新手退出VIM 。
34、“我给你出个脑筋急转弯，你说达芬奇密码的上面是什么？” “这。。太难了吧。。不知道。。。” “笨！达芬...
MySQL error 1449: The user specified as a definer does not exist
...finer for views
Run this SQL to generate the necessary ALTER statements
SELECT CONCAT("ALTER DEFINER=`youruser`@`host` VIEW ",
table_name, " AS ", view_definition, ";")
FROM information_schema.views
WHERE table_schema='your-database-name';
Copy and run the ALTER statements
How to change the...
How to update two tables in one statement in SQL Server 2005?
... by GROUP BY, HAVING, or DISTINCT clauses.
TOP is not used anywhere in the select_statement of the view together with the WITH CHECK OPTION clause.
In all honesty, though, you should consider using two different SQL statements within a transaction as per LBushkin's example.
UPDATE: My original ass...
Optimal way to concatenate/aggregate strings
...Transact SQL, which should work fine in Azure.
;WITH Partitioned AS
(
SELECT
ID,
Name,
ROW_NUMBER() OVER (PARTITION BY ID ORDER BY Name) AS NameNumber,
COUNT(*) OVER (PARTITION BY ID) AS NameCount
FROM dbo.SourceTable
),
Concatenated AS
(
SELECT
...
C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
... list.Clear();//清空列表
fStream.Position = 0;//重置流位置
list = (List<Programmer>)binFormat.Deserialize(fStream);//反序列化对象
foreach (Programmer p in list)
{
Console.WriteLine(p);
}
...
C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
... list.Clear();//清空列表
fStream.Position = 0;//重置流位置
list = (List<Programmer>)binFormat.Deserialize(fStream);//反序列化对象
foreach (Programmer p in list)
{
Console.WriteLine(p);
}
...
C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
... list.Clear();//清空列表
fStream.Position = 0;//重置流位置
list = (List<Programmer>)binFormat.Deserialize(fStream);//反序列化对象
foreach (Programmer p in list)
{
Console.WriteLine(p);
}
...