Name of the table - low, capital letters
HelloThank you for reading my post.
--------------------------------------------------------------------------------------------------------------------------------
(1) I created a table:
CREATE TABLE radios (name varchar2 (20), varchar2 (20)) frequency;
Note that the table name is tiny ("radio").
--------------------------------------------------------------------------------------------------------------------------------
(2) I added a constraint on the column 'name ':
ALTER TABLE ADD CONSTRAINT name_pk KEY (name) PRIMARY radio;
--------------------------------------------------------------------------------------------------------------------------------
(3) now, I want to list the existing constraints for the table "radio".
3.a) if I use low table name of case, the result is empty:
SQL > SELECT constraint_name, constraint_type
From user_constraints
WHERE table_name = 'radio '.
no selected line
3.b) now, if I use the high table name of case, I get what I'm looking for:
SQL > SELECT constraint_name, constraint_type
From user_constraints
WHERE table_name = 'RADIOS ';
CONSTRAINT_NAME C
NAME_PK P
--------------------------------------------------------------------------------------------------------------------------------
Can you explain this phenomenon?
I mean: I've created a tiny name table so why it works
with the formulation of capital letters?
Have we not create uppercase table constantly names?
How to create table names: you create uppercase?
Thank you for your help.
Sincerely,
--
Lmhelp
All the names of the objects are stored in uppercase letters, unles you use double quotation marks to create:
SQL > create table TesT_1 (number);
Table created.
SQL > create table 'TesT_2' (a number);
Table created.
SQL > select table_name from user_tables where table_name like '%1' or table_name like '%2 ';
TABLE-NAME
------------------------------
TEST_1
TesT_2
More details:
http://download.Oracle.com/docs/CD/B28359_01/server.111/b28286/sql_elements008.htm
Published by: SKU on December 9, 2009 02:42
Tags: Database
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