In SQL Server SQL Server Analysis Services, data must be fed to a data mining algorithm as a series of cases that are contained within a case table. However, not all cases can be described by a single row of dat
1.如何在PL/SQL中创建和使用Nested table 1DECLARE2/**创建一个 nested table **/3TYPE type_nstb_noind_varistableofvarchar2(300);4/** 创建一个索引类型为varchar的nested table,也可以指定其它类型(BINARY_INTEGER、PLS_INTEGER、String、Long、RAW、LONG RAW、ROWID,CHAR,CHARACTER) **/5Type type_nstb_...
SQL> CREATE OR REPLACE TYPE color_tab_t AS TABLE OF VARCHAR2(30); 2 / Type created SQL> SQL> CREATE TABLE color_models ( 2 model_type VARCHAR2(12) 3 , colors color_tab_t 4 ) 5 NESTED TABLE colors STORE AS color_model_colors_tab 6 / Table created SQL> SQL> BEGIN 2 INSERT IN...
Connected to Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 Connected as xxpo SQL> CREATE OR REPLACE TYPE color_tab_t AS TABLE OF VARCHAR2(30); 2 / Type created SQL> SQL> CREATE TABLE color_models ( 2 model_type VARCHAR2(12) 3 , colors color_tab_t 4 ) 5 NESTED TABLE ...
OraclePLSQL 之嵌套表（NestedTable ）Test Code:Connected to Oracle Database 11g Enterprise Edition Release color_model_colors_tab 6 / Table created SQL> SQL> BEGIN 2 INSERT INTO color_models 3 VALUES ('RGB', color_tab_t ('RED','GREEN','BLUE'));4 END;5 / PL/SQL procedure ...
前置说明:本文是线上环境的实战问题拆解,涉及复杂 DSL,看着会很长,但强烈建议您耐心读完。 问题描述: 有个复杂的场景涉及到按照求和后过滤,user_id是用户编号,gender是性别,time_label是时间标签,时间标签是nested结构,intent_order_count是意向订单数量,time是对应时间。
实验sql 假如有10000个城市,对应于10个国家(此例子仅仅可以解释join工作的过程) 更换优化器,添加索引,会影响下面的执行计划。 代码语言:javascript 代码运行次数:0 drop table country;CREATETABLEcountry(country_idSMALLINTNOTNULL,country_nameVARCHAR(50)NOTNULL);drop table city;CREATETABLEcity(city_idVARCHAR(50...
根项也就是这里的electronics的父项id为null,这种表结构非常的简单,而且我们很清楚的看到:flash的父项是MP3 , MP3的父项是protable electronics、protable electronics 的父项是electronics等等。虽然在客户端编码中邻接表模型处理起来也相当的简单,但是如果是纯SQL编码的话,该模型会有很多问题。
(Paris Region) SQL Syntax Reference (Paris Region) Spark SQL Syntax Reference Common Configuration Items of Batch SQL Jobs SQL Syntax Overview of Batch Jobs Spark Open Source Commands Databases Creating an OBS Table Creating a DLI Table Deleting a Table Checking Tables Modifying a Table Syntax for...
根项也就是这里的electronics的父项id为null,这种表结构非常的简单,而且我们很清楚的看到:flash的父项是MP3 , MP3的父项是protable electronics、protable electronics 的父项是electronics等等。虽然在客户端编码中邻接表模型处理起来也相当的简单,但是如果是纯SQL编码的话,该模型会有很多问题。 检索整个树 检索整个...