将字符串转换为日期 SQL Server

Question

I have a query when I need to convert a string to datetime, I use

CONVERT(DATETIME, '')

but it's still not working. My column fechac is of type Datetime .

If I pass in for example '2019-11-20 00:03:56.120' , the query works but I don't need the time because is a parameter from an application web and I send the date example '2019-11-20'. Thanks!

This is my query:

SELECT * 
FROM table 
WHERE cb.fechac = CONVERT(DATETIME, '2019-11-20');

Answer 1

Use the format yyyyMMdd . With the datetime datatype yyyy-MM-dd is ambiguous. Otherwise, use a style code :

CONVERT(datetime,'2019-11-20',126);
CONVERT(datetime,'20191120')

Reading a lot through the lines in the comments here, however, are you actually after..?:

WHERE fechac >= '20191120'
  AND fechac < '20191121'

Final reading through the lines. it appears the OP is actuaklly passing a parameter (I assume of the data type date ), therefore...

WHERE fechac >= @fechac
  AND fechac < DATEADD(DAY, 1, @fechac)

Answer 2

这应该适用于任何系统，无论国际化设置如何：

WHERE cb.fechac=convert(DATE,'20191120');

Answer 3

SELECT *
FROM table cb
WHERE cast(cb.fechac as date) = convert(date, '2019-11-20', 23)