mysql - 如何在mysql中写多个条件的触发器

Question

我制作了两个包含以下字段的表:

TABLE 1: "demo"
FIELD: "demoid"
FIELD: "cpid"
FIELD: "status"     


TABLE 2: "sample"
FIELD: "id"
FIELD: "conid"    
FIELD: "statussample"
FIELD: "date"

每当示例表字段 statussample 更改时，我想更新 status。条件是

1) `demoid` and `id` would be same and `cpid` and `conid` would be same.(if more than one values comes i want the last inserted value of  `sample` using the field `date`)

该怎么做？我一直坚持这个......新的触发器格式

Answer 1

DELIMITER //

CREATE TRIGGER sample_after_update
AFTER UPDATE
    ON sample FOR EACH ROW

BEGIN

   UPDATE demo
   SET demoid = NEW.id,
       cpid   = NEW.conid

END; //
DELIMITER;