在过去的一年中,我一直花费大部分时间处理noSQL数据库。也就是说,我已经开始了一个与SQL数据库和SQL Server Management Studio(SSMS)一起工作的新工作。任何可以提高可读性并使查询更简洁的建议都将受到高度赞赏。使用SSMS改进我的SQL查询
SELECT DISTINCT
[db1].[id] as "Node ID",
[db2].[name] as "Node Name",
[db3].[name] as "ISP",
[db4].[name] as "City",
CASE
WHEN [db1].[object_type_id] = 17
THEN 'Client'
WHEN [db1].[synthetic_location].[object_type_id] = 5
THEN 'System'
WHEN [db1].[object_type_id] IS NULL
THEN 'System'
END AS Type
FROM
[db1].[synthetic_location]
JOIN
[db2].[machine] ON [db2].[synthetic_location_id] IS NULL
JOIN
[db3].[internet_service_provider] ON [db3].[id] = [db1].[internet_service_provider_id]
JOIN
[db4].[geography_city] ON [db4].[geography_city].[id] = [db1].[synthetic_location].[geography_city_id]
WHERE
[db2].[status_type_id] < 1
AND [db1].[flags] = 6
它是什么不可读和不简明? – dfundako
似乎没有标准。你看到一些非常糟糕的。这对我来说很好。这个问题可能会关闭,因为你只是在问风格。 – Paparazzi
您的第一次加入并未说明要加入的列,例如db1.synthetic_location.column_name = db2.machine.coumn_name和db2.machine.column_name为'db1.synthetic_location.column_name join db2.machine.column_name'为空' –