在GLSL(OpenGL Shading Language)编程中,遇到“index expression must be constant”错误时,通常表示你在数组索引时使用了非常量表达式。以下是对该错误的详细解释和解决方案: 1. 错误含义 在GLSL中,数组索引必须是一个常量表达式。这意味着你不能使用变量或非常量表达式来索引数组。这是因为GLSL编译器需要在编译时确定...
A column in the filtered index expression doesn't need to be a key or included column in the filtered index definition if the filtered index expression is equivalent to the query predicate and the query doesn't return the column in the filtered index expression with the query results....
The partition number of a partitioned index that is to be rebuilt or reorganized. partition_number is a constant expression that can reference variables. These include user-defined type variables or functions and user-defined functions, but can't reference a Transact-SQL statement. partition_number...
If the pattern expression contains qualified names, anamespace-declarationmust be specified to define namespace prefixes. A default namespace can be defined for unqualified names. DECLARE NAMESPACEnamespace-prefix=namespace-uri Mapsnamespace-prefix,which is an NCName, tonamespace-uri, which is a...
A column in the filtered index expression should be a key or included column in the filtered index definition if the query predicate uses the column in a comparison that is not equivalent to the filtered index expression. For example, FIBillOfMaterialsWithEndDate is valid for the following quer...
partition_number is a constant expression that can reference variables. These include user-defined type variables or functions and user-defined functions, but can't reference a Transact-SQL statement. partition_number must exist or the statement fails. WITH ( <single_partition_rebuild_index_option>...
The function used for building the index can be an arithmetic expression or an expression that contains a SQL function, user-defined PL/SQL function, package function, or C callout. For example, a function could add the values in two columns. ...
a. Mathematics A number or symbol, often written as a subscript or superscript to a mathematical expression, that indicates an operation to be performed, an ordering relation, or a use of the associated expression. b. A number derived from a formula, used to characterize a set of data. 6...
ERROR: functions in index expression must be marked IMMUTABLE创建函数索引报错,”functions in index expression must be marked IMMUTABLE” ,意思为建立函数索引时 函数必须标识为 “IMMUTABLE”。3 查看 to_char 函数12345678910111213 skytf=> \df to_char(); List of functions Schema | Name | Result ...
主键或唯一键不能是维的子集 (SQLSTATE 429BE)。 如果指定了 ONnickname,那么仅当索引键的数据包含数据源表的每一行的唯一值时才应指定 UNIQUE。 将不会检查唯一性。 对于基于 XML 数据的索引,仅当pattern-expression的上下文步骤指定单个完整路径并且不包含后代或后代或自身轴 "//" ,xml-通配符,节点 ()或处理...