1=1 or (1=0 and 0=1) (put and into parentheses)

   

SQL>
SQL>
SQL>
SQL> select 'is true  ' as condition
  2  from   dual
  3  where  1=1 or (1=0 and 0=1);

CONDITION
---------
is true

SQL>

1.	Query specific columns with where clause and 'or' operator
2.	OR operator
3.	OR operator : combine date compare and number compare
4.	Query specific columns with where clause, or operator and order by
5.	(1=1 or 1=0) and 0=1
6.	1=1 or 1=0 and 0=1 (no parentheses)
7.	Use or to connect two boolean expression
8.	OR operator combines two comparisons into one

1=1 or (1=0 and 0=1) (put and into parentheses) : OR « Select Query « Oracle PL / SQL