Need help with complex column creation command
I need help with a complex column creation command and SQL anywhere help is not sufficient for it.
Here is the situation:
I need to write a generic DDL "alter table" command, which can add/modify columns without knowing in advance if they already exist in the destination table.
Is there a command, which looks like:
alter table "table1" add (on existing modify) column1 <datatype> <default> ?
I don't think this is supported in alter table command. But you can code that inside an if statement which queries systables & syscolumns. Your code should be something like that:
if (select count(*) from sysobjects, syscolumns where sysobjects.id = syscolumns.id and sysobjects.name = 'some_table' and syscolumns.name = 'some_column') < 1
alter table some_table add some_column numeric(12) not null
This is an example..