How to query the default port number of the mainstream database system

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Database default port query method

Oracle 1521 is viewed in the Oracle Net Manager interface

DB2 50000 executes db2 get dbm cfg in db2cmd | find "SVCENAME"

SQL Server 1433 is viewed in SQL Server Configuration Manager

PostgreSQL 5432 enter show port on the command line

MySQL 3306 enter show variables like 'port%' on the command line

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