Tag: column

Feed: R-bloggers. Author: sang-heon lee. [This article was first published on K & L Fintech Modeling, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your content on R-bloggers? click here if you have a blog, or here if you don't. This post makes a useful wrapper R function merge() for left outer join, which preserves the orders of row and column of input x data. It is not a must but useful when we prefer these fixed orders in some case. Left Outer Join which we try to do ... Read More

Feed: Recent Announcements. Amazon Web Services, Inc. (AWS), an Amazon.com company (NASDAQ: AMZN), extends Automatic Table Optimization to modify column compression encodings. This new capability maintains the optimal compression encodings in Amazon Redshift database tables on an ongoing basis to achieve high performance and reduce the storage utilization. By using automation to manage column compression, customers can ensure that column compression encodings are always optimized in order to get the best possible performance. A compression encoding specifies the type of compression that is applied to data values in a column as rows are added to a table. Choosing the right ... Read More

Feed: Recent Announcements. Amazon Redshift, a fully-managed cloud data warehouse, now supports case-insensitive collation with column and expression level overrides. Starting today, you can use the COLLATE clause within a CREATE DATABASE statement to specify the default collation for all CHAR and VARCHAR columns in the database as case-sensitive or case-insensitive. You can also specify a COLLATE clause in a CREATE TABLE statement to specify collation for columns in that table. In addition, the COLLATE() function allows you to override the collation of a string column or an expression. Collation is a set of rules that defines how database engines ... Read More

Feed: Planet PostgreSQL. This blog is about my work on the Postgres open source database, and is published on Planet PostgreSQL. PgLife allows monitoring of all Postgres community activity. Jsonb Multi-Column Type Casting Monday, May 3, 2021 I already covered jsonb type casting of single values. However, if you are extracting multiple values from jsonb that casting method can be cumbersome, and it also has limitations. Fortunately, there is another way — a way to retrieve multiple jsonb or json values and cast everything in one location. Here is a simple table taken from my previous blog post: CREATE TABLE ... Read More

Feed: Planet PostgreSQL. Contributing author David YouattAn underappreciated element of PostgreSQL performance can be the data types chosen and their organization in tables. For sites that are always looking for that incremental performance improvement, managing the exact layout and utilization of every byte of a row (also known as a tuple) can be worthwhile. This is an important consideration for databases that are migrating from other databases to PostgreSQL as the data types available in PostgreSQL and how they are laid out is unlike many other platforms ... Read More

Feed: Planet PostgreSQL. Every so often, on irc, someone asks how to get value from column that is passed as argument. This is generally seen as not possible, as pl/PgSQL doesn't have support for dynamic column names. We can work around it, though. Are the workarounds usable, in terms of performance? To test it, I will need some sample data. This doesn't have to be big, but let's make it big enough so that I can test performance within Pg itself. Let's say 10 million rows. =$ CREATE TABLE test ( id int4 generated always AS IDENTITY PRIMARY KEY, payload ... Read More

Feed: Planet MySQL; Author: Joshua Otwell; Be it running reports or displaying data in some other visualization, SQL SELECT column expressions should be meaningful and understandable. To provide those valuable query results, SQL Developers, use a multitude of available functions, adjacent columns, or other means not readily apparent to end-users. All that being said, the column names often suffer the most as far as readability is concerned, taking on long function call names or other combined expressions. But, as luck would be on our side, there is an easy fix and that is aliasing columns using the AS keyword. Although ... Read More

Feed: SAS Blogs. Author: Chevell Parker. View more Problem Solvers postsA customer recently contacted SAS Technical Support and wanted to know how he could generate a report that displays just the column headings for a data set (or table) that does not contain any records. Rather than just omitting the missing data, he wanted to provide his customers with a visual way to see where data was missing. This blog demonstrates how to create a report that provides only the column headings for data that is missing. The blog also explains how to create, select, and exclude output objects as ... Read More

Feed: SAS Blogs. Author: Mike Gilliland. Following is Editor Len Tashman's preview of the new issue of Foresight: The International Journal of Applied Forecasting. Jonathon Karelse, author of the lead story, will be presenting in the Practitioner Track of the International Symposium on Forecasting (June 27-30). Preview of Foresight #61 (2021:Q2) For many years, we’ve identified Foresight issues by the seasons of publication as those of us who live in the Northern Hemisphere experience them. A continuation of this policy would see the current issue labeled Spring 2021. But Foresight is distributed to IIF members across the globe, including many ... Read More

Feed: CronJ. Author: Nupur Pal; IntroductionWell, you must have come across the terms 3PL and 4PL quite often. But have you ever wondered what these terms mean? Or where are these terms used? Now if you belong from the field of logistics, then you must have an in-depth knowledge about them. But if you are a beginner and want to know all about it then this article is just for you. Oh, and for you, logistics managers, if you want to know how to improve your logistics performance then simply stay tuned. Since we have a little surprise for you ... Read More