if not exists( select 1 from dbo.syscolumns s
where name ='yourColumn'
and id = object_id(N'YourTable'))
begin
alter table YourTable add yourColumn ColumnType
end
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if not exists( select 1 from dbo.syscolumns s
where name ='yourColumn'
and id = object_id(N'YourTable'))
begin
alter table YourTable add yourColumn ColumnType
end
相关文章：