Oracle query data out garbled problem?

Why is the data generated by Oracle garbled?

the installation of the database and the client encoding code inconsistencies will produce garbled, To fix this problem, change the client code to

1. select * FROM table;

If this is the problem there are many ways to solve, the following is a more general approach

1. Check Character set encoding

SELECT * from V$nls_parameters;

2. Use this information to conclude that you need to configure environment variables

Add key-value to the user variable

LANG ZH_CN. GBK

Add key-value to system variable

Nls_lang simplified Chinese_china. ZHS16GBK

Complete the above configuration before restarting the following PL/SQL client, I hope I can help you thank you ^_^

Oracle query data out garbled problem?