mysql - Error to create view use ifnull function in mysql

Question

select g.id, ifnull(s.count, 0)
from t_goods g
left join v_stock s on g.id = s.id

This sql works well, and then I create a view:

create or drop view v_goods_stock as
select g.id, ifnull(s.count, 0)
from t_goods g
left join v_stock s on g.id = s.id

I get the error:

[Err] 1064 - You have an error in your SQL syntax

My mysql version is 5.5.

I try to remove the ifnull function like this

create or drop view v_goods_stock as select g.id id, s.count c from t_goods g left join v_stock s on g.id = s.id

I still get the same error.

score 2 · Accepted Answer

您必须为计算值指定列名：

create or replace view v_goods_stock as
select g.id, ifnull(s.count, 0) as count
from t_goods g  
left join v_stock s on g.id = s.id

默认列名是表达式本身ifnull(s.count, 0)，它不是一个有效的名称（包含括号、逗号等）

score 0 · Accepted Answer

您的问题很简单，与以下内容无关IFNULL()：MySQL 无法识别语法CREATE OR DROP VIEW。（这里是的语法参考CREATE VIEW。）

如果您需要此语句在视图已经存在时工作，请删除单词OR DROP，或者将其替换为。OR REPLACE

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