Question

CREATE VIEW tcs.meter_data_eb2 AS
select ar.created_date AS created_date,
p.id AS parameter_id,
p.parameter_name AS parameter_name,
ar.parameter_value AS parameter_value,
m.meter_primary_id AS meter_id,
m.meter_name AS meter_name
m.meter_code As meter_code
 from tcs.parameter_values_archieve ar
 inner join tcs.parameter_master p on p.id = ar.parameter_id
 inner join tcs.meter_primary_master m on m.meter_primary_id = ar.meter_id
 inner join tcs.meter_master mm on mm.meter_primary_id = m.meter_primary_id;

此查询有什么问题？

给出错误：

您的SQL语法有错误;检查手册对应于您的MySQL服务器版本，以便使用正确的语法靠近'm.meter_code作为来自tcs.parameter_values_archieve ar的meter_code 内联接tc'在第8行

Answer 1

您只是在m.meter_name和m.meter_code

之间缺少逗号

, m.meter_name AS meter_name, m.meter_code AS meter_code

全视图查询，

CREATE VIEW tcs.meter_data_eb2
AS
SELECT ar.created_date AS created_date , 
        p.id AS parameter_id , 
        p.parameter_name AS parameter_name , 
        ar.parameter_value AS parameter_value , 
        m.meter_primary_id AS meter_id , 
        m.meter_name AS meter_name,
        m.meter_code AS meter_code
FROM    tcs.parameter_values_archieve ar
        INNER JOIN tcs.parameter_master p
            ON p.id = ar.parameter_id
        INNER JOIN tcs.meter_primary_master m
            ON m.meter_primary_id = ar.meter_id
        INNER JOIN tcs.meter_master mm
            ON mm.meter_primary_id = m.meter_primary_id;

使用join创建视图

1 个答案: