在同时处理不同数据类型的值时,SQL Server一般会自动进行隐式类型转换,这种隐式类型。转换对于数据类型相近的数值是有效的,比如int和float,但是对于其他数据类型,例如整数类型和字符数据类型,这种隐式转换就无法实现了,此时必须使用显式转换。为了实现这种转换,Transact-SQL提供了两个显式转换的函数,分别是CAST()函数和...
Creating a CLR function in SQL Server involves the following steps: Define the function as a static method of a class in a language supported by the .NET Framework. For more information about how to program functions in the common language runtime, see CLR user-defined functions. Then, compi...
Creating a CLR function in SQL Server involves the following steps: Define the function as a static method of a class in a language supported by the .NET Framework. For more information about how to program functions in the common language runtime, see CLR user-defined functions. Then, compi...
Ranking Functions in SQL ServerArticle 03/24/2010 SQL Server introduced four different ranking functions either to rank records in a result-set or to rank records within groups of records of a result-set. With this inclusion we are no longer required to write several lines of code to get ...
PATINDEXReturns the position of a pattern in a string QUOTENAMEReturns a Unicode string with delimiters added to make the string a valid SQL Server delimited identifier REPLACEReplaces all occurrences of a substring within a string, with a new substring ...
Like functions in programming languages, SQL Server user-defined functions are routines that accept parameters, perform an action, such as a complex calculation, and return the result of that action as a value. The return value can either be a single scalar value or a result set. Benefits of...
Implementing table valued functions in Transact-SQL is easy: create function t_sql_tvfPoints() returns @points table (x float, y float) as begin insert @points values(1,2); insert @points values(3,4); return; end This is fine if your function can be done entirely in Transact-SQL. Bu...
Implementing table valued functions in Transact-SQL is easy: create function t_sql_tvfPoints() returns @points table (x float, y float) as begin insert @points values(1,2); insert @points values(3,4); return; end This is fine if your function can be done entirely in Transact-SQL. Bu...
We had a problem whenever we wanted to identify the end date of a month. There was no built in function. But now that problem is solved in SQL Server 2012. The function EOMONTH returns the date of the month. SELECT EOMONTH('05/02/2012') AS 'EOM Processing Date' ...
This topic describes the change tracking functions in SQL Server 2008 and how to use them to obtain the changes that are made in a database and information about the changes. About the Change Tracking Functions Applications can use the following functions to obtain the changes that are made in...