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Count(*) vs Count(1) - SQL Server
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In SQL Server, these statements yield the same plans.
Contrary to the popular opinion, in Oracle they do too.
SYS_GUID() in Oracle is quite computation intensive function.
In my test database, t_even is a table with 1,000,000...
How to request a random row in SQL?
... request a random row (or as close to truly random as is possible) in pure SQL?
28 Answers
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What's the best way to store co-ordinates (longitude/latitude, from Google Maps) in SQL Server?
I'm designing a table in SQL Server 2008 that will store a list of users and a Google Maps co-ordinate (longitude & latitude).
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Avoid duplicates in INSERT INTO SELECT query in SQL Server
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In MySQL you can do this:
INSERT IGNORE INTO Table2(Id, Name) SELECT Id, Name FROM Table1
Does SQL Server have anything similar?
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Find all tables containing column with specified name - MS SQL Server
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@Revious INFORMATION_SCHEMA views included in SQL Server comply with the ISO standard definition for the INFORMATION_SCHEMA., sys.columns, sys.tables is Microsoft Sql Server specific.
– Tomasito
Mar 18 '14 at 21:36
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SQL Server IIF vs CASE
I recently came to know about the availability of IIF function in SQL Server 2012. I always use nested CASE in my queries. I want to know the exact purpose of the IIF statement and when should we prefer using IIF over CASE Statement in the query.
I mostly use nested CASE in my queries.
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What's the purpose of SQL keyword “AS”?
You can set table aliases in SQL typing the identifier right after the table name.
9 Answers
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Escaping keyword-like column names in Postgres
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Some warning: Without the quotes PostgreSQL folds all identifiers to lowercase. MyTable, myTable and mytable are just the same. With the quotes this folding is not done. So "MyTable" is no more the same as mytable.
– A.H.
Oct ...
Check if table exists in SQL Server
...ke this to be the ultimate discussion on how to check if a table exists in SQL Server 2000/2005 using SQL Statements.
28 An...
再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升
...eber]标记的类和属性会被DataContractSerializer序列化。在WCF中使用Contract模式来分辨和指定序列化/反序列化的类型，它是通过http://xmlns/Class这样的命名空间来标识这个序列化的对象的，一旦在序列化过程中无法找到这样的标识（比如...