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请看下面的SQL查询。在MySQL触发器中创建变量
DELIMITER $$
CREATE TRIGGER `Portfolio_AINS` AFTER INSERT ON `Portfolio` FOR EACH ROW
INSERT INTO Initial_Fees (idPortfolio, Current_Time_Stamp, Initial_Gross_Fee, Initial_Monetary_Fee)
VALUES (
New.idPortfolio,
current_timestamp,
(New.Invest_Amount*(New.Initial_Gross_Fee/100)),
(New.Invest_Amount*(New.Initial_Gross_Fee/100))*(New.Initial_Company_Fee/100)
)
在这里,Initial_Monetary_Fee = Initial_Gross_Fee * (New.Initial_Company_Fee/100)
但我写它(New.Invest_Amount*(New.Initial_Gross_Fee/100))*(New.Initial_Company_Fee/100)
取而代之的是,我想创建变量和分配值给他们,所以我能避免这样长的计算。举个例子,像下面这样的东西。
InitialGrossFee = (New.Invest_Amount*(New.Initial_Gross_Fee/100))
IntialMonetaryFee = InitialGrossFee * (New.Initial_Company_Fee/100)
那么,我该如何创建这样的变量并将值存储在侧面的MySQL触发器中呢?我更喜欢有一些解释。