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Nested select statement in SQL Server
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SQL how to increase or decrease one for a int column in one command
...al ways to do this. Since you did not specify a database, I will assume MySQL.
INSERT INTO table SET x=1, y=2 ON DUPLICATE KEY UPDATE x=x+1, y=y+2
REPLACE INTO table SET x=1, y=2
They both can handle your question. However, the first syntax allows for more flexibility to update the record rath...
How to assign an exec result to a sql variable?
How do you assign the result of an exec call to a variable in SQL? I have a stored proc called up_GetBusinessDay , which returns a single date.
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optional parameters in SQL Server stored proc?
I'm writing some stored procs in SQL Server 2008, and wondered if the concept of optional input parameters is possible here?
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How do SQL EXISTS statements work?
I'm trying to learn SQL and am having a hard time understanding EXISTS statements. I came across this quote about "exists" and don't understand something:
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Unique Constraint in Entity Framework Code First
...alizable isolation level because of performance reasons. The default in MS Sql Server is read committed. See the 4 part series starting at: michaeljswart.com/2010/03/…
– Nathan
Jan 15 '14 at 16:32
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Difference Between Schema / Database in MySQL
Is there a difference between a schema and a database in MySQL? In SQL Server, a database is a higher level container in relation to a schema.
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Difference between left join and right join in SQL Server [duplicate]
I know about joins in SQL Server.
9 Answers
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What's the difference between a temp table and table variable in SQL Server?
In SQL Server 2005, we can create temp tables one of two ways:
12 Answers
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Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...撑的连接数个数，而并非qps，当然qps也是我们需要考虑的性能点之一。这种应用常见于消息推送系统，也称为comet应用，比如聊天室或即时消息推送系统等。comet应用具体可见我之前的介绍，在此不多讲。对于这类系统，因为很...