SQL Server日期时间文字-将数据类型varchar转换为float时出错

Question

Am sure I'm missing something obvious here, but how do I pass a datetime string literal to SQL server?

For instance:

select * 
from [dbo].temp_rk_table 
where tx_from <= '2015-10-01T06:37:16'  
  and '2015-10-01T06:37:16' < tx_to

gives:

Error converting data type varchar to float.

Also:

select * 
from [dbo].temp_rk_table 
where tx_from <= convert(datetime,'2015-10-01T06:37:16')
  and convert(datetime,'2015-10-01T06:37:16' ) < tx_to

gives:

GetNextRows failed. : Arithmetic overflow error converting expression to data type datetime.

??

Answer 1

So (as per the comments) I was indeed missing something obvious! The TX_FROM and TX_TO variables were defined as FLOAT and hence would not accept my converted datetime strings.

Be sure your datetimes are indeed defined as datetimes. The query below may help ( source ):

select data_type + 
    case
        when data_type like '%text' or data_type like 'image' or data_type like 'sql_variant' or data_type like 'xml'
            then ''
        when data_type = 'float'
            then '(' + convert(varchar(10), isnull(numeric_precision, 18)) + ')'
        when data_type = 'numeric' or data_type = 'decimal'
            then '(' + convert(varchar(10), isnull(numeric_precision, 18)) + ',' + convert(varchar(10), isnull(numeric_scale, 0)) + ')'
        when (data_type like '%char' or data_type like '%binary') and character_maximum_length = -1
            then '(max)'
        when character_maximum_length is not null
            then '(' + convert(varchar(10), character_maximum_length) + ')'
        else ''
    end as CONDENSED_TYPE
    , *
from information_schema.columns