I using a query where I am selecting some attributes from the table based on a where condition. My where condition is-
date>GetDate();
I have tried this-
SELECT TOP 2 img,name,substring(description,1,80) as
description,Convert(nvarchar,date,106) as date
FROM tbl_test
where date>=Convert(nvarchar,GetDate(),106)
order by date Asc;
This query is running fine but showing different result as compared to a different query of similar kind in which I am not converting the date format.
SELECT TOP 2 img,name,substring(description,1,80) as description,date
FROM tbl_test
where date>=GetDate()
order by date Asc;
Please guide me where I am doing wrong?
Your first query will convert getdate() into nvarchar data type and it will compare date with string while 2nd query will compare 2 dates. So 2nd option is better. Still if you want to convert date into string then check then use 102 format like
WHERE CONVERT(varchar(20),date,102) >= CONVERT(varchar(20), getdate(),102)
For select column you can use format which you want like
SELECT CONVERT(varchar(20),date,106)
Final Query is :
SELECT TOP 2
img,
name,
SUBSTRING(description,1,80) as description,
CONVERT(varchar(20),date,106) as [DisplayDate]
FROM tbl_test
WHERE CONVERT(varchar(20),date,102) >= CONVERT(varchar(20), getdate(),102)
ORDER BY date ASC;
Without convert to varchar, you can cast getdate() to date to remove time part :
SELECT TOP 2
img,
name,
SUBSTRING(description,1,80) as description,
CONVERT(varchar(20),date,106) as [DisplayDate]
FROM tbl_test
WHERE date >= CAST(getdate() as date)
ORDER BY date ASC;
SQL Fiddle Demo
DECLARE #Date Datetime;
SET #Date = GETDATE();
SELECT CONVERT(VARCHAR(12), #Date, 113) AS Date
RESULT
╔══════════════╗
║ Date ║
╠══════════════╣
║ 01 Jan 2014 ║
╚══════════════╝
Edit
as Upendra Chaudhari has explained that when you do comparing column Date with a string =Convert(varchar(20),GetDate(),102),
what is actually happening behind the scenes is Convert(varchar(20),GetDate(),102) returns a string 2014.01.01 but to compare this string with a Datetime column SQL Server does an implicit conversion to compare both values. Sql Server have to have both values in the same datatype to compare them.
Now datatype Datetime has Precedence over nvarchar/varchar datatype so sql server converts the string into datetime datatype which returns something like
SELECT CAST('2014.01.01' AS DATETIME)
Result : 2014-01-01 00:00:00.000
Now in this process of converting your values to string and then back to datetime you have actually lost all the time values in your comparing values. and this is the reason why you are getting unexpected results back.
so make sure whenever you are comparing to have exactly the same datatype on both sides and take control of any data conversions in your code rather then sql server doing datatype conversions for you.
I hope this will explain you why you are getting different results .
You may try:
where date>=CONVERT(VARCHAR(11), GETDATE(), 113)
Related
I have 4 CTE's in this table and the third one contains a DATETIME converted to VARCHAR (with format based on the requirement) as startDate in DD/MM/YYYY format. The last cte does calculations based on the data generated and one of the columns needs to store YYYYMM date based on startDate.
The problem it's getting the year and the month from this converted DATETIME, using convert() it shows this:
IDPER
-------
01/01/ --DD/MM/
These 2 show YYYYMM correctly when startDate isn't converted:
Select *, left(convert(nvarchar(6),new_ini,112),6) as IDPER from table
Select *, convert(nvarchar(6),new_ini,112) as IDPER from table
How could I get YYYYMM format having startDate converted? Or what could be a more smart approach to the requirement
If you have a string in the format DD/MM/YYYY and you want YYYYMM, then use string operations:
select right(new_ini, 4) + substring(new_ini, 4, 2)
You should be storing date values as dates or a related type, not as string. But given that you have already stored this as a string, string operations can do what you need.
My way would be slightly different
SELECT CONVERT(NVARCHAR(6), CONVERT(DATE, new_ini, 103), 112);
Here, I first converted it to date and then formatted to YYYYMMDD and taken 6 chars only
declare #date DATE = GETDATE();
select REPLACE(LEFT(CONVERT(DATE,#date,112),8),'-','') -- 1st approach
select FORMAT(#date,'yyyyMM') --2nd approach
I have VARCHAR column (MyValue) in my table. It has date value in two different format.
MyValue
----------
25-10-2016
2016-10-13
I would like to show them in DATE format.
I wrote query like below:
SELECT CONVERT(date, MyValue, 105) FROM MyTable
SELECT CAST(MyValue as date) FROM MyTable
Both are giving me this error. Conversion failed when converting date and/or time from character string.
Is there anyway convert to DATE datatype format even the value stored in different formats like above?
Expecting your answers. Thanks in advance.
Does this help?
declare #varchardates table
(
vcdate varchar(20)
)
INSERT INTO #varchardates VALUES
('25-10-2016'),
('2016-10-13')
SELECT CONVERT(date,vcdate, case when SUBSTRING(vcdate, 3, 1) = '-'
THEN 105 ELSE 126 END) as mydate
FROM #varchardates
Depending on how many different formats you have in your data, you may need to extend the case statement!
See here for list of the different format numbers
You can use TRY_CONVERT and COALESCE. TRY_CONVERT returns NULL if the conversion fails, COALESCE returns the first NOT NULL value:
SELECT COALESCE(TRY_CONVERT(DATETIME, x, 105), TRY_CONVERT(DATETIME, x, 120))
FROM (VALUES('25-10-2016'), ('2016-10-13')) a(x)
I assumed the value 2016-10-13 is in format yyyy-MM-dd.
You mention in a comment you may have other formats as well. In that case it gets very tricky. If you get a value 01-12-2017 and you have no idea about the format, there is no way to tell whether this is a date in januari or in december.
I want to retrive data from table according to a particular time so I use this query below.
select * from a
where convert(smalldatetime,date,datepart(hh,date)) ='09:12:00'
but I get no row as result. So what should I do for my expected result?
You can convert directly to varchar as below
SELECT * FROM a
WHERE CONVERT(VARCHAR(8), [date], 108) = '09:12:00'
Try this:
SELECT *
FROM a
WHERE CONVERT(VARCHAR(8), [DATE],108) = '09:12:00'
Your datatype is already smalldatetime so you have to convert to varchar and compare with string.
EDIT:
Answer explanation:
You have smalldatetime inside [DATE] column. For example 2015-10-01 09:12:00. To compare only time you need to convert to string which contains only time. For this reason you will use command CONVERT from TSQL.
It will convert smalldatetime to 8 characters string. As a result you will have 09:12:00 and then you compare it with your string.
In Sql server 2008 you can convert to TIME. By specifying TIME(0) you have the desired format:
SELECT *
FROM a
WHERE CAST(date as time(0)) ='09:12:00'
//CONVERT(data_type(length),expression,style)
SELECT * FROM a
WHERE CONVERT(varchar(8),[columnName],108) = '09:12:00'
I want to find records from my database which lie between any user input date range(say between 10/2/2008 to 26/9/2024). I tried using
SELECT NAME
,TYPE
,COMP_NAME
,BATCH_NO
,SHELF
,MFG_DATE
,EXP_DATE
,QTY
,VAT
,MRP
FROM STOCK_LOCAL
WHERE
convert(VARCHAR(20), EXP_DATE, 103)
BETWEEN convert(VARCHAR(20), #MEDICINEEXP_DATE, 103)
AND convert(VARCHAR(20), #MEDICINEEXPDATE, 103)
but with this query i need to enter perfect date range which is available in my database, it is not giving me data lying in between any date entered.
Thanks in advance
Since it is a poolr designed schema there isnt going to be any decent/Efficient solution for this.
In sql server if you are storing Date or Date & Time data. Use the Data or DATETIME datatypes for your columns.
In your case you are trying to compare a string with passed date. and even when you tried to convert the string (Date) into date datatype you didnt do it correctly.
My suggestion would be Add new columns to your table with Date datatype and update these columns with existing date/string values.
For now you can convert the Date(string) into date datatype using the following code.
DECLARE #MEDICINEEXP_DATE DATE = 'SomeValue1'
DECLARE #MEDICINEEXPDATE DATE = 'SomeValue1'
SELECT query....
FROM TableName
WHERE
CAST(
RIGHT(EXP_DATE, 4)
+SUBSTRING(EXP_DATE,CHARINDEX('/',EXP_DATE)+1,2)
+LEFT(EXP_DATE,2)
AS DATE) >= #MEDICINEEXP_DATE
AND CAST(
RIGHT(EXP_DATE, 4)
+SUBSTRING(EXP_DATE,CHARINDEX('/',EXP_DATE)+1,2)
+LEFT(EXP_DATE,2)
AS DATE) <= #MEDICINEEXPDATE
Note
This solution will get you the expected results but very inefficient method. It will not make use of any indexses on your EXP_DATE Column even if you have a very buffed up index on that column.
I am using SQL Server 2005.
My Trade_Date column is of datatype datetime.
It has values as: 2/12/2013 11:59:00 PM , 2/13/2013 11:59:00 PM
i.e. different dates with time.
I want to compare date [only date] in where clause.
I am trying with following query:
select *
from foclosing
where CONVERT(varchar(11), Trade_Date) like '2/12/2013 %'
or
select *
from foclosing
where Trade_Date = CONVERT(datetime, '2/12/2013')
but both of these queries are not working.
What can be the issue?
select * from foclosing
where Trade_Date >= '20130212' AND Trade_Date < '20130213'
Use yyyymmdd which is safe for SQL Server
Don't apply functions to columns, then compare (your 1st query)See mistake 2 here: https://www.simple-talk.com/sql/t-sql-programming/ten-common-sql-programming-mistakes/
Don't compare locale-based dates as varchar (your 1st query)
Trade_Date has a time element which is why your 2nd query fails
In summary, a date conversion should not be used for examples like this: datetime is a range