MSSQL Create Function函数自定义 对于多处使用case when 来判断的SQL语句会觉得整个语句很繁琐。 对于MSSQL可以提供给用户自定义函数。虽然比较少用。 实例:将查询的字段进行非空处理。 分析:数据通过外表汇总过来,null值可以通过默认过滤掉,但对于外表是' '字段无法设置默认值。 1 2 3 4 5 6 7 8 9 10 11...
在純量函數中,function_body 是一系列的 Transact-SQL 陳述式,這些陳述式會一起評估為純量值。 在多重陳述式資料表值函式中,function_body 是 Transact-SQL 陳述式序列,這些陳述式會擴展 TABLE 傳回變數。 scalar_expression 指定純量函數傳回的純量值。 TABLE 指定資料表值函式的傳回值是資料表。只有常數和...
In-Memory OLTP-Syntax für systemeigene kompilierte, skalare benutzerdefinierte Funktionen.syntaxsql Kopieren CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL | NOT NULL ] [ = default ] [ ...
Syntax for CLR function clauses. syntaxsql Copy <order_clause> ::= { <column_name_in_clr_table_type_definition> [ ASC | DESC ] } [ , ...n ] <method_specifier> ::= assembly_name.class_name.method_name <clr_function_option> ::= { [ RETURNS NULL ON NULL INPUT | CALLED ON NU...
Using CREATE PARTITION FUNCTION is the first step in creating a partitioned table or index. Transact-SQL Syntax Conventions Syntax Copy CREATE PARTITION FUNCTION partition_function_name ( input_parameter_type ) AS RANGE [ LEFT | RIGHT ] FOR VALUES ( [ boundary_value [ ,...n ] ] ) [ ;...
syntaxsql -- In-Memory OLTP: Syntax for natively compiled, scalar user-defined functionCREATE[ORALTER]FUNCTION[schema_name. ]function_name( [ { @parameter_name[AS][type_schema_name. ]parameter_data_type[NULL|NOTNULL] [ = default ] [READONLY] } [ ,...n ] ] )RETURNSreturn_data_ty...
Transact-SQL 标量函数的语法。 syntaxsql复制 CREATE[ORALTER]FUNCTION[schema_name. ]function_name( [ { @parameter_name[AS] [type_schema_name. ]parameter_data_type[NULL] [ = default ] [READONLY] } [ , ...n ] ] )RETURNSreturn_data_type[WITH<function_option>[ , ...n ] ] [AS]BEGIN...
Transact-SQL 标量函数的语法。 syntaxsql复制 CREATE[ORALTER]FUNCTION[schema_name. ]function_name( [ { @parameter_name[AS] [type_schema_name. ]parameter_data_type[NULL] [ = default ] [READONLY] } [ , ...n ] ] )RETURNSreturn_data_type[WITH<function_option>[ , ...n ] ] [AS]BEGIN...
-- Transact-SQL Scalar Function Syntax CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ][ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ ,...n ] ] ) RETURNS return_data_type [ WITH <function_option>...
function-name Names the function being defined. It is a qualified or unqualified name that designates a function. The unqualified form offunction-nameis an SQL identifier. In dynamic SQL statements, the CURRENT SCHEMA special register is used as a qualifier for an unqualified object name. In sta...