Compare blob in SQL statement

Question

Hi,
Is it possible to compare blob in SQL statement?
Example:
Table1 (id number
image long raw);
Table2 (name varchar2
pic long raw);
select id, name from table1, table2
where image = pic

Answer 1

Hi,
Try the following and see if it works :
I have TEXT in the LONG RAW column and not image
files.
Method I
You can use PL/SQL to check if the 2 Long RAW Columns are
identical or not :
NOTE :- PL/SQL however has a limitation of processing
data size less than 32k in size. If the
Long Raw column exceeds 32k in size then PL/SQL
cannot be used.
SQL> desc temp9;
Name Null? Type
ID NUMBER
COL1 LONG RAW
SQL> desc temp9a;
Name Null? Type
ID NUMBER
COL1 LONG RAW
SQL> @t
Id = 1, Long Raw is not the same
Id = 2, Long Raw is the same
PL/SQL procedure successfully completed.
SQL> select id from temp9;
ID
1
2
SQL> get t
1 Set ServerOutput On Size 999999;
2 Declare
3 CURSOR c1 Is
4 Select id, col1
5 from temp9;
6 xCol1 Temp9a.Col1%Type;
7 BEGIN
8 For x In c1 Loop
9 Select col1
10 Into xCol1
11 From temp9a
12 Where id = x.id;
13 If ( x.col1 = xCol1) Then
14 Dbms_Output.Put_Line ('Id = ' || x.id || ', Long Raw is the same');
15 Else
16 Dbms_Output.Put_Line ('Id = ' || x.id || ', Long Raw is not the same');
17 End If;
18 End Loop;
19 END;
20* /
Method II
You can create a Database function for the above script and use it within
your SQL .
-- Shailender Mehta --