#1064 - 第 7 行的 SQL 语法有错误

Question

enter code here
    DELIMITER $$
DROP TRIGGER IF EXISTS `Update_Status`$$
CREATE TRIGGER `Update_Status` AFTER INSERT ON `occurance_time`
FOR EACH ROW BEGIN 
IF NOT EXISTS (SELECT `F_Seen` FROM `Total_Hours` WHERE (`SSN`=new.`SSN` and `Day_Date`=new.`Day_Date`))
THEN
INSERT INTO `total_time` (`SSN`,`Name`,`Day_Date`,`F_Seen`) VALUES(new.`SSN`,new.`Name`,new.`Day_Date`,new.`Cap_time`);
ELSE
UPDATE `total_time` SET(`L_Seen`=new.`Cap_time`) WHERE (`SSN`=new.`SSN` and `Day_Date`=new.`Day_Date`);
END$$

---

我已经在插入触发器 On Occurrence _time 后创建了这个我想在 Total_time 表中存储一天的第一次发生时间和一天的最后一次发生时间，但收到此错误 “1064 - 您的 SQL 语法有错误；请查看与您的 MariaDB 服务器版本相对应的手册，了解在 '(L_Seen=new.Cap_time) WHERE (SSN=new.@ 987654325@ 和 Day_Date=new.`Day_Date...' 在第 7 行" ***

Answer 1

请使用SET L_Seen=new.Cap_time，而不是SET(L_Seen=new.Cap_time)。你也错过了end if。下面的代码正在运行。

CREATE TRIGGER `Update_Status` AFTER INSERT ON `occurance_time`
FOR EACH ROW 
BEGIN 
IF NOT EXISTS (SELECT `F_Seen` FROM `Total_Hours` WHERE `SSN`=new.`SSN` and `Day_Date`=new.`Day_Date`)
THEN
INSERT INTO `total_time` (`SSN`,`Name`,`Day_Date`,`F_Seen`) VALUES(new.`SSN`,new.`Name`,new.`Day_Date`,new.`Cap_time`);
ELSE
UPDATE `total_time` SET `L_Seen`=new.`Cap_time`  WHERE `SSN`=new.`SSN` and `Day_Date`=new.`Day_Date`;
end if;
end

DB-Fiddle：

 create table occurance_time(SSN varchar(50),Name varchar(50),Day_Date date,Cap_time time);

 CREATE TRIGGER Update_Status AFTER INSERT ON occurance_time 
 FOR EACH ROW BEGIN 
 IF NOT EXISTS (SELECT F_Seen FROM total_time WHERE SSN=new.SSN and Day_Date=new.Day_Date) 
 THEN
 INSERT INTO total_time (SSN,Name,Day_Date,F_Seen) VALUES(new.SSN,new.Name,new.Day_Date,new.Cap_time); 
 ELSE
 UPDATE total_time SET L_Seen=new.Cap_time WHERE SSN=new.SSN and Day_Date=new.Day_Date; 
 end if; 
 end 

db小提琴here