In-memory OLTP syntax for natively compiled, scalar user-defined functions. syntaxsql 复制 CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL | NOT NULL ] [ = default ] [ READONLY ] } [ ...
> SELECT area(c1, c2) AS area FROM t; 0.0 2.0 -- Use a SQL function in the WHERE clause of a query. > SELECT * FROM t WHERE area(c1, c2) > 0; 1 2 -- Compose SQL functions. > CREATE FUNCTION square(x DOUBLE) RETURNS DOUBLE RETURN area(x, x); > SELECT c1,...
新建的SQL语言定义函数的名称。函数名称需要在项目内唯一,同名函数只能注册一次,且不能与系统内建函数同名。您可以通过LIST FUNCTIONS命令查看项目下的全部函数,来检查是否有同名函数。 parameter_in:必填。函数的输入参数。入参支持函数类型参数(包括匿名函数)。入参为函数类型的示例详情请参见SQL UDF示例:入参为函数...
No more than 90 parameters are allowed (SQLSTATE 54023). It is possible to register a function that has no parameters. In this case, the parentheses must still be coded, with no intervening data types. For example: CREATE FUNCTION WOOFER() ... No two identically-named functions within a...
User-defined functions in SQL Server has a fixed number of parameters. There is no provision to create a function that takes a variable number of parameters. So the best you could do is to create a CREATE_WS which takes, say, six strings plus the separator. But then you need to always...
如果程序代码包含 IRIS Macro Preprocessor语句(# commands, ## functions,或$$$ Macro references),则这些语句的处理和扩展是过程方法定义的一部分,并在方法编译时进行处理和扩展。 IRIS在生成过程时提供额外的代码行,该过程将SQL嵌入到ObjectScript“包装器”中,提供过程上下文处理程序,并处理返回值。 下面是iris...
Table type in a table-valued function as a returned value Table-Valued Function Expression (U-SQL) for examples on how to call the above functions. See Also U-SQL Functions U-SQL Table-valued Functions DROP FUNCTION (U-SQL) Table-Valued Function Expression (U-SQL) Built-in Fun...
The function may run in the same thread as the invoking SQL statement. NOT FENCED functions can keep SQL cursors open across individual calls to the function. Since cursors can be kept open, the cursor position will also be preserved between calls to the function. However, cursor names may ...
A user-defined function can implement complex calculations, taking zero or more scalar parameters and returning a scalar result. UDFs operate like built-in functions such as FLOOR() or LOWER(). For each occurrence of a user-defined function within a SQL statement, that UDF is called once per...
User-defined functions can't call a stored procedure, but can call an extended stored procedure. User-defined functions can't make use of dynamic SQL or temp tables. Table variables are allowed. SETstatements aren't allowed in a user-defined function. ...