Oracle's decode function

a grammar

decode(column_name,value1,result1,

...,defaultvalue)

two code

1. SQL>select username,decode(username,'aaa','jsj','bbb','scbm','other')as department
2. 2from users;
4. USERNAME DEPAR
5. -------------------------
6. aaa jsj
7. bbb scbm
8. cccc other
9. aaa jsj