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Using virtual db instead of cross join and rule-based filter

Using virtual db instead of cross join and rule-based filter

Using virtual db instead of cross join and rule-based filter

Scenario: We have a loopup table of Cities and we want to retrieve the cities whose name starts with a given list from a table Requests.

Solutions:
1. Typically, using Knime nodes, since it is not an exact match, we cannot do a join. Instead, we would:
(i). Do a cross join between the 2 tables;
(ii). Apply a rule-based filter;

2. Alternatively, we can load the tables in a virtual DB (in memory), for example H2, and do SQL-style JOIN

Scenario: We have a loopup table of Cities and we want to retrieve the cities whose name starts with a given list from a table Requests.Solutions:1. Typically, using Knime nodes, since it is not an exact match, we cannot do a join. Instead, we would: (i). Do a cross join between the 2 tables; (ii). Apply a rule-based filter;2. Alternatively, we can load the tables in a virtual DB (in memory), for example H2, and do SQL-style JOIN CitiesRequestsNode 3Node 4Node 5Node 6 Table Creator Table Creator H2 Connector DB Writer DB Writer DB Query Reader Scenario: We have a loopup table of Cities and we want to retrieve the cities whose name starts with a given list from a table Requests.Solutions:1. Typically, using Knime nodes, since it is not an exact match, we cannot do a join. Instead, we would: (i). Do a cross join between the 2 tables; (ii). Apply a rule-based filter;2. Alternatively, we can load the tables in a virtual DB (in memory), for example H2, and do SQL-style JOIN CitiesRequestsNode 3Node 4Node 5Node 6Table Creator Table Creator H2 Connector DB Writer DB Writer DB Query Reader

Nodes

Extensions

Links

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To use this workflow in KNIME, download it from the below URL and open it in KNIME:

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Created by: bruno
Created at: 2022-06-10
On NodePit since: 2022-06-11
Last update: 2024-11-17
Created with KNIME version: v4.5.2

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