什麼是 '＃@' 是指在Oracle查詢

Question

我有以下

SELECT 
tr.hetid, 
tr.hfncd, 
tr.op_code, 
tr.bps_batch_seq, 
substr(op_code, -3) add_del_flag, 
tr.ack_msg, 
'#@' seg_data 
from table_name 
where <condition> 

Oracle查詢我不明白，什麼 '＃@' 查詢手段

Answer 1

'#@'是一個簡單的text literal
就像其他文字文字一樣。

SELECT 
    'some name' As name, 
    'Some text' as Text, 
    'This is some string' As String, 
    '#@' As seg_data 
FROM dual 

NAME  TEXT  STRING    SE 
--------- --------- ------------------- -- 
some name Some text This is some string #@