Oracle数据库中,表字段不能直接使用序列实现自增,但可以创建一个序列,写库的时候,先调用【序列.nextval】方法取得自增的值,再将该值赋给需要自增的字段,然后写库,从而实现自增字段。 PostgreSQL除了采用上面的赋值的方式外,还 提供了三种序列的数据类型,分别叫smallserial、serial、bigserial。它们三个实际上不是真...
首先先百度一轮简介,PostgreSQL 是最先进的开放源码的数据库系统, 它提供了多版本并行控制,支持几乎所有 SQL 构件(包括子查询,事务和用户定 义类型和函数), 并且可以获得非常广阔范围的(开发)语言绑定 (包括 C,C++,Java,perl,tcl,和 python)。由于PostgreSQL的开源免费,经历了从Oracle迁移PG数据库,遇到了各种坑,...
This blog on What is PostgreSQL covers an introduction to PostgreSQL, its history, features, applications, advantages, and disadvantages of PostgreSQL.
OK, another POC patch which has some support for AT TIME ZONE when using PostgreSQL. As far as I can see SQLite is somewhat easy to fix, PostgreSQL and Oracle are fixable if we can translate the Python time zone names to something the database understands. It seems the best fix for MyS...
Ora2Pg is a free tool used to migrate an Oracle database to a PostgreSQL compatible schema. It connects your Oracle database, scan it automatically and extracts its structure or data, it then generates SQL scripts that you can load into PostgreSQL. - dar
Multi-Version Concurrency Control allows for concurrent reading and writing of tables, blocking for only concurrent updates of the same row. This way, clashes are avoided. Scalability PostgreSQL supports Unicode, international character sets, multi-byte character encodings, and it is locale-aware for ...
In addition, TOra also supports postgres and mysql if your Qt library is compiled with that support.Toolkit for Oracle is a program for database developers and administrators. The features that are available so far is (As of version 1.2):...
支持多种数据库,MySql/SqlServer/PostgreSQL/Oracle/Sqlite; 《Select》|《Update》|《Insert》|《Delete》 《表达式函数》|《CodeFirst》|《DbFirst》 《Repository》|《UnitOfWork》|《过滤器》|《乐观锁》|《DbContext》 《读写分离》|《分区分表》|《租户》|《AOP》|更新日志 ...
What is PostgreSQL as a Service? PostgreSQL as a Service (PGaaS) is a specific form of Database as a Service (DBaaS) that enables users to easily create, manage, and use Postgres databases in the cloud. Various cloud service providers offer PGaaS options, including AWS with RDS ...
We will keep innovating and producing features to ensure our users have a wonderful experience using our platform and the entire PostgreSQL software ecosystem."Michael Howard, CEO, MariaDB: "We are honored to be recognized by DB-Engines, and grateful for the continued support of our growing ...