Initializes a new instance of theScalarVariableCollectionclass that uses the specifiedCollationInfoobject and the default initial capacity. 命名空间:Microsoft.SqlServer.Management.SqlParser.MetadataProvider 程序集:Microsoft.SqlServer.Management.SqlParser(在 Microsoft.SqlServer.Management.SqlParser.dll 中) ...
If the UDF-calling query contains a variable that's used as a UDF parameter for assignment (for example,SELECT @y=2, @x=UDF(@y)) (added in SQL Server 2019 CU6). If the UDF references encrypted columns (added in SQL Server 2019 CU11). If the UDF contains references toWITH XMLNAMESP...
SqlParser.SqlCodeDom Assembly: Microsoft.SqlServer.Management.SqlParser.dll Package: Microsoft.SqlServer.SqlManagementObjects v150.18208.0 C# 复制 public Microsoft.SqlServer.Management.SqlParser.SqlCodeDom.SqlScalarVariableRefExpression Variable { get; } Property Value SqlScalarVariableRefExp...
By default (without disabling the inline), when we execute a scalar UDF in SQL Server 2019, then SQL Server automatically"choose" if to execute it as a scalar expressions or as scalar subqueriesthat are executed inline (this part is documented). This is different from table valued function w...
Historically, UDFs in SQL server were known to perform poorly. This has implicitly resulted in customers avoiding UDFs whenever possible. Some of the main reasons forpoor performancewere the following Iterative execution: UDFs are invoked in an iterative manner, once per qualifying tuple. This ...
准备好上述测试环境,我们就可以用下面脚本来测试、验证标量函数被调用了多少次(注意下面这段脚本会被多次使用,下面测试部分会多次使用,后续可能直接称呼其为test.sql,而不会每次贴出这段脚本) variablecpu number; begin :cpu := dbms_utility.get_cpu_time; ...
string sql=@"select Sites_IP_Rede from tblRamais where E164 = '"+test.ToString()+"'";Sql...
准备好上述测试环境,我们就可以用下面脚本来测试、验证标量函数被调用了多少次(注意下面这段脚本会被多次使用,下面测试部分会多次使用,后续可能直接称呼其为test.sql,而不会每次贴出这段脚本) variable cpu number; 1. begin 1. :cpu := dbms_utility.get_cpu_time; ...
A scalar function takes input argument(s) and returns a single value result. A scalar function can be used wherever an expression can be used.
Now we'll see one very interesting behavior ofCompute Scalarthat it changes in SQL Server 2005/2008. Consider the following query: DECLARE@TabTABLE( IDSMALLINTPRIMARYKEY)DECLARE@ID_IntINTEGERSELECT*FROM@TabWHEREID=@ID_Int Notice that the Column ID is aSmallInttype, and the variable@ID_Intis...