Difference between out-of-line and inline constraint?

Hello
What is the difference between i) declaring a constraint using the inline constraint syntax and ii) declaring a constraint using the syntax of the out-of-line constraint?

There is no practical difference, it's just syntax. Of course
-You cannot define a multi-column inline constraint
-Constraints NON NULL cannot be defined inline
-a NOT NULL constraint is different from an equivalent check constraint

Connected to:
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production

SQL> create table nulltest
  2  ( dummy1 number not null -- inline not null
  3  , dummy2 number check (dummy2 is not null) -- inline check constraint
  4  , dummy3 number
  5  , check (dummy3 is not null)  -- out of line check constraint
  6  );

Table created.

SQL> desc nulltest
 Name                                      Null?    Type
 ----------------------------------------- -------- ---------------

 DUMMY1                                    NOT NULL NUMBER
 DUMMY2                                             NUMBER
 DUMMY3                                             NUMBER

SQL> select constraint_name,constraint_type from user_constraints where table_na
me='NULLTEST'
  2  /

CONSTRAINT_NAME                C
------------------------------ -
SYS_C0010503                   C
SYS_C0010504                   C
SYS_C0010505                   C

SQL>

See that no NOT NULL is indicated for DUMMY2 and DUMMY3 - look in USER_CONSTRAINTS to this...

HTH

Nigel cordially

Tags: Database

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