Bagaimana cara membandingkan dua nilai CLOB di Oracle?

Formatnya begini:

dbms_lob.compare(  
lob_1    IN BLOB,  
lob_2    IN BLOB,  
amount   IN INTEGER := 18446744073709551615,  
offset_1 IN INTEGER := 1,  
offset_2 IN INTEGER := 1)  
RETURN INTEGER; 

Jika dbms_lob.compare(lob1, lob2) =0, keduanya identik.

Berikut ini contoh kueri berdasarkan contoh Anda:

Select key, glob_value  
From source_table Left Join target_table  
  On source_table.key = target_table.key  
Where target_table.glob_value is Null  
  Or dbms_lob.compare(source_table.glob_value, target_table.glob_value) <> 0