In this tutorial, you will learn how to use the Oracle function-based index to speed up queries that consist of functions.
Function-based index 可以很巧妙地帮助我们实现“不一般”的unique index, 但是如果没有注意function-based index对于该index对应的function的要求,很有可能会触发ORA-01802这个错误。 本文尝试去阐述这个错误是如何触发的,以及如果去解决。 OK, let’s get down to business. 记得Tom大叔的力作《Oracle编程艺术》中提...
A nonunique index can be used to enforce a primary key or unique constraint. In Oracle8i indexes can be rebuilt without locking the table. The DROP COLUMN option of the ALTER TABLE command is restartable. The MOVE option of the ALTER TABLE command retains the constraints of the table. Data...
Oracle Database Exadata Express Cloud Service - Version N/A and later: ORA-10631 When Trying To Shrink A Table That Has A Function-based Index.
链接:https://www.eygle.com/archives/2006/01/create_function_based_index.html 留言版上的第2330号问题是: 在oralce中给自建函数创建索引,结果不成功。 source:Create Index IDX_T_SP_TWOTYPESTAT_0_f On T_SP_TWOTYPESTAT_0(f_dateadd(yearmonth,12,2)); ...
oracle 函数Function 基本使用 函数Function |-概念:与存储过程类似,遵循相同的规则,只能传递IN类型参数,不能使用OUT类型参数,其主要特征是必须有返回值; |-函数和存储过程的异同: |-标识符不同,函数-Function,存储过程-procedure; |-函数中一般不用传递变量,除非作为调试使用。使用函数名直接返回函数值;...
Positions in Oracle strings are 1-based, meaning the first character is at position 1. The result of this query will be an integer representing the position of the substring 'TH' within the string 'THIS IS THE THING'. Since 'TH' appears at the very beginning, the expected output is 1...
SQL_CU_PROCEDURE_INVOCATION = Catalogs are supported in the ODBC procedure invocation statement.SQL_CU_TABLE_DEFINITION = Catalogs are supported in all table definition statements: CREATE TABLE, CREATE VIEW, ALTER TABLE, DROP TABLE, and DROP VIEW.SQL_CU_INDEX_DEFINITION = Catalogs are supported ...
compact1, compact2, compact3 java.util.function Interface Function<T,R> Type Parameters: T- the type of the input to the function R- the type of the result of the function All Known Subinterfaces: UnaryOperator<T> Functional Interface: ...
in function 已进入函数,并且即将执行第一行。序进程后的第一个可执行代码用作实际断点位置。它可能是要初始化的局部变量所在的那一行。如果是 C++ 构造函数,在执行了所有基类构造函数后,将停止执行。如果使用 -instr 修饰符(请参见-instr),则它是即将执行的函数的第一个指令。function 规范可以接受形式参数签名...