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altering table

Posted on 2011-09-19
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I want to alter table's column's (x) to change to datatype to bit and set default to 'false'  how can I do that?
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Question by:1jaws
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Accepted Solution

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Kevin Cross earned 2000 total points
ID: 36564075
1jaws,

You can use, ALTER TABLE ALTER COLUMN and ADD CONSTRAINT.
BOL: http://msdn.microsoft.com/en-us/library/ms190273.aspx

For example, if your column is called Flag1 in the Table1 table:
ALTER TABLE Table1 
ALTER COLUMN Flag1 BIT NOT NULL;
ALTER TABLE Table1 
ADD CONSTRAINT Flag1Dflt 
DEFAULT 0 FOR Flag1;

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If you have existing data that fits BIT data type, use WITH VALUES:
ALTER TABLE Table1 
ALTER COLUMN Flag1 BIT NOT NULL;
ALTER TABLE Table1 
ADD CONSTRAINT Flag1Dflt 
DEFAULT 0 FOR Flag1 WITH VALUES;

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Kevin
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Author Comment

by:1jaws
ID: 36564226
I am doing second one and it is giving me error saying cannot insert null into tbl1... by the way what is Flag1Dflt means?
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LVL 60

Assisted Solution

by:Kevin Cross
Kevin Cross earned 2000 total points
ID: 36564245
Sorry. I plugged in NOT NULL. If field has NULLs currently and NULLs are allowed then that should be just NULL. Flat1Dflt is name of the CONSTRAINT. You can name that what you want. If you do not want NULLs, then before doing the ALTER statement:

UPDATE Table1 SET Flag1 = 0
WHERE Flag1 IS NULL;

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Author Closing Comment

by:1jaws
ID: 36564250
thank you!!
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