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用两个这玩意存到SQL表格里边在读取出来加减结果是NaN？？？

附代码

if(voxels.name(voxel) == 'coffee' || voxels.name(voxel) == 'milk'){
        db.sql`UPDATE list1 SET record_e = ${new Date().valueOf()} WHERE name = ${entity.player.name}`;
        st = db.sql`SELECT * FROM list1 WHERE name=${entity.player.name} ORDER BY record_s ASC LIMIT 1`; 
        et = db.sql`SELECT * FROM list1 WHERE name=${entity.player.name} ORDER BY record_e ASC LIMIT 1`
        entity.position.set(1, 32, 121);
        if((et-st)<=30000){
            world.say(`${entity.player.name}仅用${(et-st)/1000}秒到达终点，挑战成功！`)
            entity.player.directMessage(`恭喜你获得血量增加500`)
            entity.hp += 500
        }
        else{
            world.say(`${entity.player.name}到达了终点`)
            entity.player.directMessage(`用时${(et-st)/1000}秒，在30秒内通关才可挑战成功！`)
            entity.hp += 200
        }
        
    }

原版Scriptjvav代码（）

表格信息

db.sql`CREATE TABLE IF NOT EXISTS list1 (
        name VARCHAR(50) NOT NULL,
        record_s REAL,
        record_e REAL
    )`