行:1文本:createorreplacefunctionselect_table_marco(table_nametable)---错误用法四CREATEORREPLACEfunctionselect_table_marco(table_name varchar2)returnvarchar2 SQL_MACROisstmtvarchar(2000);beginstmt :='select select_table_marco.table_name from hr.countries';returnstmt;end;/select*fromselect_table_marco...
There are also a number of caching methods that can increase the performance of function calls in SQL, and may be more appropriate than a scalar SQL macro in some circumstances. You can read more about efficient function calls from SQLhere. ...
create or replacepackageGENisfunctionRANGE(stop number)returnvarchar2SQL_MACRO(TABLE);functionRANGE(first numberdefault0,stop number,step numberdefault1)returnvarchar2SQL_MACRO(Table);endGEN;/create or replacepackagebodyGENisfunctionRANGE(stop number)returnvarchar2SQL_MACRO(TABLE)is beginreturnq’{select*...
最后总结一下 SQL Macro 的意义:• SQL宏提供了一个基于SQL的简单框架,用于封装业务/技术逻辑–无需在查询中调用自定义PL / SQL过程和函数• 可以在SQL语句内的任何地方使用;• 自动继承所有常用的数据库内查询优化;• 可以建立参数化视图;• 简化从非Oracle数据库迁移到Oracle数据库; 这就是 Oracle 20c...
在Oracle 20c 中,SQL的宏支持 - SQL Macro 为 SQL 开发带来了进一步的敏捷和便利,在这篇文章中,我们来详细了解一下 SQL Macro 的特性用法。 以下是概要介绍: 宏的作用在于让SQL获得进一步的概括和抽象能力,允许开发者将复杂的处理逻辑通过宏进行定义,然后在后续程序处理中可以反复引用这一定义。
Oracle Account Manage your account and access personalized content.Sign up for an Oracle Account Sign in to my Account Sign in to Cloud Access your cloud dashboard, manage orders, and more.Free Cloud Platform Trial Sign in to Cloud SQL_MACRO句では、ファンクションにSQLマクロとしてのマー...
在Oracle 20c 中,SQL的宏支持 - SQL Macro 为 SQL 开发带来了进一步的敏捷和便利,在这篇文章中,我们来详细了解一下 SQL Macro 的特性用法。 以下是概要介绍: 宏的作用在于让SQL获得进一步的概括和抽象能力,允许开发者将复杂的处理逻辑通过宏进行定义,然后在后续程序处理中可以反复引用这一定义。
我们先看看ORACLE官方是怎么说的https://docs.oracle.com/en/database/oracle/oracle-database/21/nfcon/sql-macros-282902288.htmlYoucancreateSQLMacros(SQM)tofactoroutcommonSQLexpressionsandstatementsintoreusable,parameterizedconstructsthatcanbeusedinotherSQLstatements.SQLmacroscaneitherbescalarexpressions,typically...
You can only call SQL macros where you are allowed to call functions in a SQL. And you are not allowed to do this inside column declaration in PIVOT. This is what ORA-56901 is saying. In fact, I think Oracle don’t even check that the function is a SQL macro. We are experiencing ...
22.1.2 Why Use SQL Modeling in Data Warehouses? Oracle modeling enables you to perform sophisticated calculations on your data. A typical case is when you want to apply business rules to data and then generate reports. Because Oracle Database integrates modeling calculations into the database,...