Data model conversion into database Generate database script according to DB design, “Database”-“Generate Database…”;
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Set the script storage path and name, select “Direct generati
Author: Simo
Deploy high performance PostgreSQL cluster
Postgres-XL is composed of three major components: the GTM (Global Transaction Manager), the Coordinator and the Datanode. Their features are given in the following sections. GTM (Global Transactio
PostgreSQL – How do I know the actual count in a big table of high insertion rates
Suppose I have a table with exactly 10M rows. I need to know the exact number of rows. It takes 5 seconds for COUNT requests. Suppose 100 rows are added to the table every second.
If I now re
An article detailed Nosql database Redis
A picture to explain the branch products of DB
Introduction to osql database
It is a non-relational database service that can solve the concurrency capabilities of conventional databases,
How to sort in PostgreSQL via UUID?
Is there any order guarantee for using uuid_generate_v1() on postgresql?
If yes, it does not matter whether it is guaranteed to generate the UUID on each machine or on which machine? Since V1
Anyone uses the NOSQL database for medical record storage?
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
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