ORACLE处理组合索引含有in条件时,对于in条件列是索引非前导列,也会考虑选择性: 1)如果前导列选择性很好,后面的列条件是in,可能index access只有前导列,in的作为index filter,这时候不用inlist iterator算子。 2)如果前导列选择性不好,则会调用inlist iterator算子,转为多个索引区间扫描,这样in条件也会index acce...
下面对这个sql进行inlist的查询转换: ops$admin@orcl>altersessionsetoptimizer_index_caching=100;delete/*+ use_concat*/fromtest twherecol1=:1andcol2in( :2, :3, :4, :5, :6, :7, :8, :9, :10, :11, :12, :13, :14, :15, :16, :17, :18, :19, :20, :21);---|Id|Operati...
postgres=# \d+tpart_list Partitioned table"public.tpart_list"Column|Type|Collation|Nullable|Default|Storage|Stats target|Description---+---+---+---+---+---+---+---a|text||notnull||extended||b|integer|||plain||c|integer|||plain||Partition key:LIST(a)Indexes:"tpart_list_pkey"P...
1.SQL*PLUS定义,它是一个由ORACLE开发的、能够运行SQL语句的环境,它也是提供了一种连接数据库的直接运行方式。 2.SQL*PLUS特征 它是一个client应用工具。如命令行SQL*PLUS、Oracle中的SQL*PLUS 或iSQL*PLUS他们都能够与数据库管理系统直接通信。 3.假设出现以下界面,就是SQL*PLUS环境。例如以下图: 四、显示表...
我在Oracle中有一个sql查询: SELECT listagg(A.name, ",") within group (ORDER BY A.id) as A, listagg(B.name, ",") within group (ORDER BY B.id) as B FROM some_table join A on A.id = some_table.id join B.name = some_table.name where some_table.status in (1,2,3) group ...
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Portlist.ini Oracle安装完成后,install目录下的portlist.ini文件记录了OEM、iSQL*Plus等服务的URL及端口号。问题中的文件名的正确拼写和格式应为"portlist.ini",尽管原文存在空格格式错误(如"in stall"应为"install"),但核心问题指向Portlist.ini是明确的。故答案正确且命题完整,无需舍弃。反馈...
Show all tables in the Oracle Database To showall tablesin the entire Oracle Database, you query from thedba_tablesview as follows: SELECTtable_nameFROMdba_tables;Code language:SQL (Structured Query Language)(sql) You will get the following error message if you don’t have access to thedba...
PL/SQLHome » Oracle Basics » Oracle IN Oracle INSummary: in this tutorial, you will learn how to use the Oracle IN operator to determine whether a value matches any value in a list or a subquery. Introduction to Oracle IN operator The Oracle IN operator determines whether a value mat...
Applies to: SQL Server 2016 (13.x) Power BI Report Server SharePoint To include data from a Microsoft SharePoint list in your report, you must add or create a dataset that is based on a report data source of type Microsoft SharePoint List. This is a built-in data source type based ...