CODEWITHSUNDEEP
sql-server
Ali Adravi
Ali Adravi

Reputation: 22763

SQL Server - Get all records with invalid date format

In existing database there a field CreatedOn varchar(10) which contains some invalid dates like 99/99/9999 and many more.

I want to change all the invalid dates to 1/1/1990, so I can convert this column to datetime by using

ALTER TABLE xyzAlter Column CreatedOn DateTime

but it is giving error:

Msg 242, Level 16, State 3, Line 2
The conversion of a varchar data type to a datetime 
   data type resulted in an out-of-range value.

Is there any way to get all the records which are not in correct date time format?

Upvotes: 4

Views: 15517

Answers (2)

Anup Shah
Anup Shah

Reputation: 1254

You can use ISDATE ( expression ).

Upvotes: 0

KM.
KM.

Reputation: 103637

try this:

select * from yourTable WHERE ISDATE(yourColumn)!=1

see: ISDATE(), it returns 1 if the expression is a valid date, time, or datetime value, otherwise it returns a 0.

EDIT to update then alter your column try this:

--table name: xyz
--column name: CreatedOn varchar(10) to datetime

UPDATE xyz
    SET CreatedOn ='1990/01/01'
    WHERE ISDATE(CreatedOn)!=1
GO
ALTER TABLE xyz Alter Column CreatedOn DateTime
GO

Upvotes: 9

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