本次實驗一張表中的90%的資料由相關連的外表（b表）資料得到，即用觸發器得到。

https://blog.csdn.net/IT_95/article/details/84064958

那麼如何實現這張表裡面的資料得到一個總的值放在一個欄位呢？

第一時間的想法是在這張表（b表）裡面加觸發器實現，但是觸發器實現的是兩張表之間的資料變化。

最後的解決方案是在a表中觸發器裡面加上更新欄位資料指令

UPDATE db_corporatecreditscore SET IntegrityTotalScore=SolvencyIndicatorScore+ProfitabilityIndicatorScore+BusinessIndicatorScore+PerformanceIndicatorScore+DevelopmentIndicatorScore+TranceBackIndicatorScore;
 

連著上一個觸發器，一起執行就可以實現。

觸發器程式碼如下：

BEGIN
IF new.EventKind=1 THEN
UPDATE db_corporatecreditscore SET SolvencyIndicatorScore=SolvencyIndicatorScore+new.ScoreChange WHERE CreditCode=new.CreditCode;
END IF;
IF new.EventKind=2 THEN
UPDATE db_corporatecreditscore SET ProfitabilityIndicatorScore=ProfitabilityIndicatorScore+new.ScoreChange WHERE CreditCode=new.CreditCode;
END IF;
IF new.EventKind=3 THEN
UPDATE db_corporatecreditscore SET BusinessIndicatorScore=BusinessIndicatorScore+new.ScoreChange WHERE CreditCode=new.CreditCode;
END IF;
UPDATE db_corporatecreditscore SET IntegrityTotalScore=SolvencyIndicatorScore+ProfitabilityIndicatorScore+BusinessIndicatorScore+PerformanceIndicatorScore+DevelopmentIndicatorScore+TranceBackIndicatorScore;
END
 

資料庫表資訊如下

a表：

b表：