How do I alter columns data type in SQL server 2012(from varchar to float)?

Question

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SQL-Server-2008R2

SQL

ALTER TABLE tablename ALTER COLUMN columname datatype

is not working

What I have tried:

SQL

ALTER TABLE purchaserequestdetail ALTER COLUMN quantity float

Posted 24-Jul-16 20:35pm

neeraj_

Updated 24-Jul-16 21:04pm

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Karthik_Mahalingam · Accepted Answer · 2016-07-24T21:04:00

Solution 1

try this
Replace the non numeric values to Null and then try to alter the type.

SQL

update purchaserequestdetail set quantity =  case   ISNUMERIC(quantity) when 1 then quantity else null  end  
ALTER TABLE purchaserequestdetail ALTER COLUMN quantity float

Note : Take a backup of the table before updating.

Posted 24-Jul-16 21:04pm

Karthik_Mahalingam

Comments

neeraj_ 25-Jul-16 3:32am

thanks sir
but not working
Msg 8114, Level 16, State 5, Line 1
Error converting data type varchar to float.