What kind of tables, you can not see from USER_TABLES
I'm a little confused on the following queriesOE > SELECT nom_segment, segment_type FROM WHERE user_segments nom_segment = "CATEGORIES_TAB";
NOM_SEGMENT SEGMENT_TYPE
--------------------------------------------------------------------------------- ------------------
CATEGORIES_TAB TABLE
OE > SELECT table_name FROM user_tables WHERE table_name = 'CATEGORIES_TAB ';
no selected line
OE > SELECT COUNT (*) FROM categories_tab;
COUNT (*)
----------
22
OE > SELECT * FROM categories_tab WHERE rownum < = 1;
CATEGORY_NAME CATEGORY_DESCRIPTION
-------------------------------------------------- --------------------------------------------------
monitors hardware1
>
What type of table appears in WHERE USER_SEGMENTS, behaves like a normal table, but does not appear in USER_TABLES
Thank you
User_tables displays only the relational tables. Tables of objects are displayed in USER_ALL_TABLES:
SQL> select count(*) from user_tables;
COUNT(*)
----------
0
SQL> select count(*) from user_segments;
COUNT(*)
----------
0
SQL> create table t of xmltype;
Table created.
SQL> select count(*) from user_tables;
COUNT(*)
----------
0
SQL> select count(*) from user_segments;
COUNT(*)
----------
4
SQL> select count(*) from user_all_tables;
COUNT(*)
----------
1
Tags: Database
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Version Oracle 11.2.0.2
I have a problem where I try to avoid duplicates in a table using a trigger. Data looks like:
EQUIP LO ACCT
---------- -- ----
1000000000 0
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1000000002 0
1000000003 0
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for example
EQUIP LO ACCT
---------- -- ----
1000000000 1 1234
1000000001 1 1234
1000000002 0
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*
ERROR on line 1:
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Are there other ways in addition to a trigger to achieve?
Thank you!
Adam
Monty77 wrote:
... I can't do this, acct is not a null value, it is ' '. Right or wrong it is not editable as integrated in application logic.
Thank you!
Adam
Then also consider this value in your index of function according to:
create table test
(
equip the varchar2 (10),
location varchar2 (2),
ACCT varchar2 (4)
);
CREATE a UNIQUE INDEX TestLocationAcct_UK ON Test
(case when the ACCT is not null ACCT AND! =' ' then location |) « ; » || end of the ACCT);
Insert test values ('1000000000 ', ' 0',' ');
Insert test values ('1000000001 ', ' 0',' ');
Insert test values ('1000000002 ', ' 0',' ');
Insert test values ('1000000003 ', ' 0',' ');
Insert test values ('1000000004 ', ' 0',' ');
Update test set acct = "1234", location = '1' where equip is '1000000000';.
Update test set acct = "1234", location = '1' where equip is '1000000001';.
Error on line 1
ORA-00001: unique constraint (SYSADM. TESTLOCATIONACCT_UK) violated
Kind regards.
Al
Name of the index has changed to testlocationacct
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