mysql - 按年调优sql

Question

我有这样的 sql 查询，其中输入是 @year = 2017 而列格式为 '2017-01-01 05:02:45.000'。我想调整这个查询，因为它的执行时间很长。

DECLARE @Device_List VARCHAR(500) = 'MKV005, MKV007, NWTN01, NWTN03, QUEEN02, MKV009';

DECLARE @YEAR VARCHAR(20) = '2017'

SELECT MONTH(deduction_timestamp) as [Month],
      ISNULL(sum(fare_deduction), 0) AS total_fare_deduction
FROM [dbfastsprocess].[dbo].[vClosingTransitLog]
WHERE bus_id in (select * from fnSplit(@Device_List, ','))
    and YEAR(deduction_timestamp) = ISNULL(@Year, YEAR(deduction_timestamp))
GROUP BY MONTH(deduction_timestamp)
ORDER BY [Month]

并且愿意这样做

SELECT MONTH(deduction_timestamp) as [Month],
      ISNULL(sum(fare_deduction), 0) AS total_fare_deduction
FROM [dbfastsprocess].[dbo].[vClosingTransitLog]
WHERE bus_id in (select * from fnSplit(@Device_List, ','))
    and (deduction_timestamp) >= '@year-01-01 00:00:00' and
 (deduction_timestamp) < '@year(plus one year)-01-01 00:00:00'
GROUP BY MONTH(deduction_timestamp)
ORDER BY [Month]

但目前由于错误无法正常工作

Conversion failed when converting date and/or time from character string.

你们能帮帮我吗？真的很感激。谢谢

Answer 1

您需要将年份变量与字符串的其余部分连接起来，不能将其嵌入到字符串中。

deduction_timestamp < CONVERT(DATETIME, @year + '-01-01 00:00:00')