change datatype int to float

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SQL-Server-2005

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i have one table

id    name  marks
1     aaa    50
2     bbb    60

and marks datatype is int default 0

and now i have change datatype float

SQL

ALTER TABLE AAA
ALTER COLUMN marks float

now i get error

ALTER TABLE ALTER COLUMN marks failed because one or more objects access this column.

give me idea how to change datatype
thanks to advance

Posted 9-Aug-13 0:32am

Rashmikants Monpara

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Manas Bhardwaj · Answer 1 · 2013-08-09T00:45:00

Solution 1

I guess you have constraints on this column. Look at the discussion here:

http://stackoverflow.com/questions/9866989/alter-table-on-dependant-column[^]

http://social.msdn.microsoft.com/Forums/sqlserver/en-US/9ca4e7b6-7ae8-4bf2-963e-23cc935b4b9c/modify-column-datatype-length[^]

Posted 9-Aug-13 0:45am

Manas Bhardwaj

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[no name] 9-Aug-13 6:49am

if possible please give me example in my table thanks

Mukesh Ghosh · Answer 2 · 2013-08-09T01:00:00

For that you need to remove realted Table Constrain First. Like

ALTER TABLE table2
DROP CONSTRAINT FK_table2_table1;
ALTER TABLE table1
DROP CONSTRAINT PK_table1;

ALTER TABLE table1
ALTER COLUMN column1 nvarchar(32) NOT NULL;
ALTER TABLE table2
ALTER COLUMN column1 nvarchar(32);

ALTER TABLE table1
ADD CONSTRAINT PK_table1
PRIMARY KEY (column1, column2)

ALTER TABLE table2
ADD CONSTRAINT FK_table1_table2
FOREIGN KEY (column1, column2)
REFERENCES table1(column1, column2)