Mysql 为视图表创建列并粘贴值'；1'；所有行

我的第一个问题是视图模式的实际用途是什么？目的是什么？如果在链接到视图的表中添加、删除或更改了某些内容，结果是否会自动更新

这是我关于一些代码的问题：

我这里有创建视图表的代码：

CREATE VIEW innerb_comma AS
SELECT CONCAT(Pcode, ',') AS Pcode,
       CONCAT(Brand, ',') AS Brand,
       CONCAT(descr, ',') AS descr,
       CONCAT(Size, ',') AS Size,
       Barcode AS Barcode
FROM innerb
WHERE NOT EXISTS (SELECT * FROM wms WHERE barcode = innerb.barcode) 
  AND Pcode like '%102';

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我想在那里插入一个名为

Quantity

的新列，只需为每一行粘贴一个编号

1

您可以在下面尝试-只需在选择列表中添加1作为数量

CREATE VIEW innerb_comma AS
SELECT CONCAT(Pcode, ',') AS Pcode,
       CONCAT(Brand, ',') AS Brand,
       CONCAT(descr, ',') AS descr,
       CONCAT(Size, ',') AS Size,
       Barcode AS Barcode, 1 as quantity
FROM innerb
WHERE NOT EXISTS (SELECT * FROM wms WHERE barcode = innerb.barcode) 
  AND Pcode like '%102'

---

您可以在下面尝试-只需在选择列表中添加1作为数量

CREATE VIEW innerb_comma AS
SELECT CONCAT(Pcode, ',') AS Pcode,
       CONCAT(Brand, ',') AS Brand,
       CONCAT(descr, ',') AS descr,
       CONCAT(Size, ',') AS Size,
       Barcode AS Barcode, 1 as quantity
FROM innerb
WHERE NOT EXISTS (SELECT * FROM wms WHERE barcode = innerb.barcode) 
  AND Pcode like '%102'

---

我不认为我能改进我不认为我能改进我所需要的完美！我会尽快完成我所需要的！时间一到我就来哈哈