SQL查询日期时间问题

Question

I have a query on SQL Server that's finding wrong results based on a datetime condition.

SET LANGUAGE Português

select distinct
       CONVERT(varchar(10), DATENAME(MONTH, i9_parcelaBase.i9_data_vencimento)) + '/' + CONVERT(varchar(10), 
       DATENAME(YEAR,i9_parcelaBase.i9_data_vencimento)) AS Periodo,
       i9_parcelaBase.i9_data_vencimento,
       i9_parcelaBase.i9_data_limite_envio_nf,
       i9_parcelaBase.i9_status_atual,
       i9_processo_statusBase.i9_status, 
       i9_processo_statusBase.i9_name
      --i9_nota_fiscalBase.i9_nota_fiscalid as ID
from  i9_parcelaBase 
  left join i9_processo_statusBase 
    on i9_parcelaBase.i9_status_atual = i9_processo_statusBase.i9_processo_statusId
where  i9_processo_statusBase.i9_entidade = 100000002 
and    i9_parcelaBase.i9_data_vencimento between CONVERT(varchar(10),  year(getdate())-1) + '-' +  CONVERT(varchar(10),  month(getdate())+1) + '-1'   
                                             and CONVERT(varchar(10),  year(getdate())) + '-' +  CONVERT(varchar(10),  month(getdate())) + '-1'
order by i9_data_vencimento asc

Basically, Month that's receiving data without '0' before (when necessary).

Sample: Actual return: '2017-6-1' Expected return '2017-06-01'

Can anyone help me to solve this problem?

Answer 1

By the look of your query, i9_data_vencimento is expected to end with just -1, not -01. You can cast the string into a date, then recast it back as a string as a way to format it:

select distinct
       CONVERT(varchar(10), DATENAME(MONTH, i9_parcelaBase.i9_data_vencimento)) + '/' + CONVERT(varchar(10), 
       DATENAME(YEAR,i9_parcelaBase.i9_data_vencimento)) AS Periodo,
       CONVERT( VARCHAR(10), CONVERT( DATETIME, i9_parcelaBase.i9_data_vencimento ), 120 ) AS i9_data_vencimento,
        :
        :

Also, considering that i9_data_vencimento is just a string, and assuming it always ends with '1' in the format 'yyyy-mm-1', you could use a LEFT function to strip off the last character and replace it with '01':

SELECT DISTINCT
       :
       LEFT(i9_parcelaBase.i9_data_vencimento, 8) + '01' AS i9_data_vencimento,
       :