DB2查詢返回0記錄

Question

我試圖執行以下查詢：

select * from trgdms.src_stm where trim(src_stm_code) in (select concat (concat('''', trim(replace(processed_src_sys_cd,',',''','''))),'''') from trgdms.batch_run_log where src_stm_cd_or_hub_cd='CTR' and file_process_dt='2015-06-19' and batch_id=42); 

表trgdms.src_stm的src_stm_code列有像T19，T68，T73等值當我孤獨我做運行內部查詢得到正確的結果：

select concat (concat('''', trim(replace(processed_src_sys_cd,',',''','''))),'''') from trgdms.batch_run_log where src_stm_cd_or_hub_cd='CTR' and file_process_dt='2015-06-19' and batch_id=42 

結果： 'T19'， 'T68'， 'T73'

如果有人使用DB2類似的東西想知道？

Answer 1

從內部查詢中刪除concat部分。當連接值時，生成的值列表將被視爲字符串，並且查詢不會返回任何結果。

select * from trgdms.src_stm where trim(src_stm_code) 
in (select trim(replace(processed_src_sys_cd,',',''',''')) from trgdms.batch_run_log 
    where src_stm_cd_or_hub_cd='CTR' and file_process_dt='2015-06-19' and batch_id=42);