Where 1 =1, Where 1 = 2, what does it mean?

Could anyone roughly tell me what does it mean?

Yes, create table t1 as select * from t where 1=2 will create a copy of t with no data in it. IT would take about as long to do it that was as it would to do it explicitly as:
CREATE TABLE t1 (col1 NUMBER, col2 VARCHAR2(10));copying the column list from t. The size of the table used in the select is not material because Oracle is smart enough to know that 1=2 will not return any rows from the selected table so will not even try.
Any equality condition of constants will work the same as 1 = 1 e.g. 'fred' = 'fred' or 1999545678342 = 1999545678342. Similarly, any inequlity predicate will work the same as 1=2 e.g. 'fred = 'barney' or 1999545678342 = 66
John

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