獲取最近2天的生產數據

Question

我有一個關於從兩天前獲取製造數據的問題。我的代碼工作，但我認爲它對我的實現效率低下。我有這個，

// YESTERDAYS FABRICATION 
      $yesterdaySql = "SELECT SUM(CURRENT_WEIGHT) AS TOTALYESTERDAYWEIGHT FROM FABRICATION_HIST 
           WHERE TO_CHAR (FAB_ENTRY_DATE,'MM/DD/YYYY') = TO_CHAR(SYSDATE - 1, 'MM/DD/YYYY') 
           AND PROJECT_NAME = :projName"; 
      $yesterdayParse = oci_parse($conn, $yesterdaySql); 
      oci_bind_by_name($yesterdayParse, ":projName", $_SESSION['cd-dropdown']);    
      oci_define_by_name($yesterdayParse, "TOTALYESTERDAYWEIGHT", $sumWeightYesterday); 
      oci_execute($yesterdayParse); 

      // TWO DAYS AGO FABRICATION 
      $twoDaysSql = "SELECT SUM(CURRENT_WEIGHT) AS TOTALTWODAYSAGOWEIGHT FROM FABRICATION_HIST 
           WHERE TO_CHAR (FAB_ENTRY_DATE,'MM/DD/YYYY') = TO_CHAR(SYSDATE - 2, 'MM/DD/YYYY') 
           AND PROJECT_NAME = :projName"; 
      $twoDaysParse = oci_parse($conn, $twoDaysSql); 
      oci_bind_by_name($twoDaysParse, ":projName", $_SESSION['cd-dropdown']);    
      oci_define_by_name($twoDaysParse, "TOTALTWODAYSAGOWEIGHT", $sumWeightTwoDays); 
      oci_execute($twoDaysParse); 

我知道這是非常低效的。任何人都可以建議我，這樣我可以在單個查詢中獲取兩天查詢？

在此先感謝

Answer 1

在這裏，你是...

SELECT 
    SUM(CASE WHEN TRUNC(FAB_ENTRY_DATE) = TRUNC(SYSDATE) - 1 THEN CURRENT_WEIGHT END) AS TOTALYESTERDAYWEIGHT, 
    SUM(CASE WHEN TRUNC(FAB_ENTRY_DATE) = TRUNC(SYSDATE) - 2 THEN CURRENT_WEIGHT END) AS TOTALTWODAYSAGOWEIGHT 
FROM FABRICATION_HIST 
WHERE FAB_ENTRY_DATE >= TRUNC(SYSDATE) - 2 
    AND FAB_ENTRY_DATE < TRUNC(SYSDATE) 
    AND PROJECT_NAME = :projName 
; 

...它通過甚至良好的可轉位：從PHP的時限爲查詢

create index i_fabrication_hist_something 
on t_fabrication_hist (project_name, fab_entry_date) 
compress 1 
compute statistics 
;