如何在 Oracle SQL Developer for PostgreSQL 中聲明變量並為其賦值

Question

我一直在研究並嘗試了多種方法來使用 Oracle SQL Developer 為 PostgreSQL 數據庫聲明變量並為其賦值，但無濟於事。 這就是我想要做的：

DEFINE response = '0'
DEFINE startDate = TO_TIMESTAMP('2020/03/28 00:00:00', 'yyyy/mm/dd HH24:MI:SS');
DEFINE endDate = TO_TIMESTAMP('2020/03/30 19:00:00', 'yyyy/mm/dd HH24:MI:SS');

SELECT clog.ch_call_index
      ,clog.ch_response AS "Response"
      ,cdata.ch_final_disposition AS "Result"
      ,clog.ch_spoken
      ,cdata.ch_recorded_msg AS "Recorded Message"
      ,cdata.ch_menu_selections AS "Menu Selections"
      ,clog.ch_spoken_dt_tm
      ,clog.ch_response_dt_tm
FROM ch_call_log clog
INNER JOIN ch_call_data cdata ON clog.ch_call_index = cdata.ch_call_index
WHERE cdata.ch_start_dt_tm >= &startDate
AND cdata.ch_start_dt_tm <= &endDate
AND (SELECT ch_response
     FROM ch_call_log
     WHERE ch_call_index = clog.ch_call_index
     ORDER BY ch_spoken_dt_tm DESC
     LIMIT 1) = '&&response'
AND clog.ch_response = '&&response'
ORDER BY cdata.ch_final_disposition

以下工作很好，但我想弄清楚如何使用變量並在需要時輕松更新它們：

SELECT clog.ch_call_index
      ,clog.ch_response AS "Response"
      ,cdata.ch_final_disposition AS "Result"
      ,clog.ch_spoken
      ,cdata.ch_recorded_msg AS "Recorded Message"
      ,cdata.ch_menu_selections AS "Menu Selections"
      ,clog.ch_spoken_dt_tm
      ,clog.ch_response_dt_tm
FROM ch_call_log clog
INNER JOIN ch_call_data cdata ON clog.ch_call_index = cdata.ch_call_index
WHERE cdata.ch_start_dt_tm >= TO_TIMESTAMP('2020/03/28 00:00:00', 'yyyy/mm/dd HH24:MI:SS')
AND cdata.ch_start_dt_tm <= TO_TIMESTAMP('2020/03/30 19:00:00', 'yyyy/mm/dd HH24:MI:SS')
AND (SELECT ch_response
     FROM ch_call_log
     WHERE ch_call_index = clog.ch_call_index
     ORDER BY ch_spoken_dt_tm DESC
     LIMIT 1) = '0'
AND clog.ch_response = '0'
ORDER BY cdata.ch_final_disposition

Answer 1

試試這個！

DECLARE start_date AS TIMESTAMP
SET start_date = TO_TIMESTAMP('2020/03/28 00:00:00', 'yyyy/mm/dd HH24:MI:SS')