Electronic medical records are composed of different types of data. The access information (date/location/insurance information) seems to be applicable to the RDMS. Other types of medical informati
Category: Database
The database is a warehouse that organizes, stores and manages data according to the data structure. It was created more than 60 years ago. With the development of information technology and the market, especially after the 1990s, data management is no longer just It is to store and manage data, and transform it into various data management methods required by users. There are many types of databases, from the simplest tables that store various data to large-scale database systems that can store massive amounts of data. They have been widely used in all aspects.
PostgreSQL – Postgres unique constraint is not forced uniqueness
This is my constraint:
CREATE UNIQUE INDEX index_subscriptions_on_user_id_and_class_type_id_and_deleted_at
ON subscriptions
USING btree
(user_id, class_type_id, deleted_at); This query pr
PostgreSQL – Postgres hierarchy – counting of sub-level, sorted by subkey or grandson
I want to know how to write a postgres subquery so that the following example will output what I need.
id parent_id postdate
1 -1 2015-03-10
2 1 2015-03-11 (child level 1)
3 1 2015
PostgreSQL arrangement by query optimization order
I encountered a small problem here.
SELECT DISTINCT ON (“reporting_processedamazonsnapshot”.”offer_id”) *
FROM “reporting_processedamazonsnapshot” INNER JOIN
“offers_boooffer”
ON (“report
Introduction to the Venice Source Code and Nosql
NoSQL (Not Only SQL), which means “not just SQL”, is a brand-new revolutionary database movement. It was proposed in the early days, and the trend has been increasing until 2009. Proponents of NoSQ
High concurrent large capacity NOSQL solution exploration
In the era of big data, enterprises also put forward higher requirements for DBAs. At the same time, NoSQL, as a newly emerging technology in recent years, has also received more and more attention
PowerDesigner batch modification column case
Faced with different database capitalization specifications, it is too troublesome to modify each field. If you use PowerDesigner design, there is a relatively simple method. Enter PowerDesigner, o
PostgreSQL – Error in top level: flunt.entityError.Nodatabase
I am trying to fix an error I recently encountered while running the Vapor project.
It builds well, but when it runs, it crashes. This is my log:
fatal error: Error raised at top level:
What does the NOSQL database mean?
Unlimited is a term currently floating in the world of NoSql.
What does this mean?
>I have a document with 3 attributes today, and then go to production, then when I need to add 2 more attri
PostgreSQL – Database exception in Slick 3.0 when insertion insertion
By batch inserting thousands of records every 5 seconds in Smooth 3, I got
org.postgresql .util.PSQLException: FATAL: sorry, too many clients already My data access layer looks like:
va