This paper deals with database preference queries involving fuzzy conditions which do not explicitly refer to an attribute from the database, but whose meaning is rather inferred from a set of rules. The approach we propose, which is based on some concepts from the fuzzy control domain (...
Vague criteria in relational database queries - Tudorie () Citation Context ...ts on the selection criterion, hence theslogical complexity.sA review of several categories of linguisticallysterms with vague meaning, their fuzzy model andsspecific operations are presented in [4], =-=[5]-=-, ...
Though the data distribution restrictions on native joins do not exist for joins made via SQL, following the join guidelines on sharding will result in much more performant queries. Kinetica supports both JOIN ... ON and WHERE clause syntax for inner joins; all outer join types (LEFT, RIGHT,...
Our data is loaded into the database without any issues! The email field will be left blank, and the purchases_list column will be pre-filled with “Coca Cola, Fanta” values meaning that we won’t need to run an additionalUPDATEon that table – the results will be pre-filled. How co...
Trino requires a few backend components to function, like the Hive metastore and a relational database, for which we will use a plain MariaDB instance. You can access the demo code for this tutorial at any time in this GitHub repo. The building blocks # 1. The data lake The data lake...
In a database you can use "in" to pass in a collection of values to compare against. This is possible in TaffyDB via the array. // does a match for column that is one of two values db({column:["value","value2"]); // Real world example - records with a status of active or...
In this case, the Transitions table is used to give meaning to the TransitionNr listed in the Transitionhistory table. For more information on the use of these tables see: Querying SOLIDWORKS PDM Database - SQL Table Diagrams SOLIDWORKS PDM Database: Query Planning Attribute This table ...
For example, filtering data early in your query using WHERE clauses can often improve performance significantly. #3. Misunderstanding Data Types SQL is a strongly typed language, meaning that data types matter. Using functions on incompatible data types can lead to errors or unexpected results. ...
Doing so does not in itself select any database to work with, but that is okay. At this point, it is more important to find out a little about how to issue queries than to jump right in creating tables, loading data into them, and retrieving data from them. This section describes ...
Tables usually do not have digits in their names, and if they do they have a special meaning. We use them to name backup tables with date of an backup (of single specific table while sensitive operation), archival tables with year or for partitioning tables. Query below finds all tables ...