不同数据库查看数据库版本的方法

select *from v$version

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE    11.2.0.4.0    Production
TNS for 64-bit Windows: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production

select @@version

Microsoft SQL Server 2017 (RTM) - 14.0.1000.169 (X64) 
    Aug 22 2017 17:04:49 
    Copyright (C) 2017 Microsoft Corporation
    Enterprise Edition: Core-based Licensing (64-bit) on Windows Server 2019 Datacenter 10.0 <X64> (Build 17763: ) (Hypervisor)

select * from version();

PostgreSQL 10.4, compiled by Visual C++ build 1800, 64-bit