SQL2000 变更列默认值的方法

知道了，很简单。不知道，搞死你。

一、查询

select column_default from INFORMATION_SCHEMA.columns where table_name='<table name>' and column_name='<column name>'

SELECT object_name(cdefault) FROM syscolumns WHERE id = object_id('<table name>') AND name = '<column name>'

--EXEC sp_depends <table name>

EXEC sp_help <table name>

二、去除

ALTER TABLE <table name> DROP CONSTRAINT <constraint name>

Example:

DECLARE @default sysname
SELECT @default = object_name(cdefault) FROM syscolumns
WHERE id = object_id('<table name>')
AND name = '<column name>'
EXEC ('ALTER TABLE <table name> DROP CONSTRAINT ' + @default)

-----------------------另--------------------

解除：EXEC sp_unbindefault '<table name>.<column name>'
删除：DROP DEFAULT <oject name>

三、加上

ALTER TABLE <table name>
ADD CONSTRAINT <constraint name> DEFAULT <default value> FOR <column name>

绑定：EXEC sp_bindefault '<oject name>, '<table name>.<column name>'

tag:SQL2000, column, default, CONSTRAINT,列,字段,默认值,约束,syscolumns,sysobjects,

-----------------------另--------------------
创建：CREATE DEFAULT oject nameAS constant_expression