Oracle sql - global variable

I have two sql script file which are to be scheduled as windows tasks. 1.sql contains this at the begining: column dat1 new_value DAY_NUMBER; select 2 dat1 from dual;

While 2.sql contains this at the begining: column dat1 new_value DAY_NUMBER; select 1 dat1 from dual;

I开发者_如何学JAVAf I am going to combine this two script into one, will DAY_NUMBER be set to 1?

Thanks a lot.

Sarah

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I think it'll generate an error:

column dat1 new_value DAY_NUMBER; select 2 dat1 from dual;

column dat1 new_value DAY_NUMBER; select 1 dat1 from dual; 

The error is that you'll have the same column variable dat1 declared twice.