Is there any way I can create a mixed case table name in Oracle without using quotes?
The table names change to uppercase if I do not use quotes while creating the table.
Let me know if you need more information.
Eg:
create table testTable(testColumn varchar);
This creates a table named TESTTABLE with column name TESTCOLUMN.
I can use quotes, but it makes it more messy and difficult to write queries.
Can you please let me know how I can do this without using quotes? Thanks.
Regards,
Sawan
Please refer to the official Oracle Database documentation:
"Nonquoted identifiers are not case sensitive. Oracle interprets them as uppercase."
https://docs.oracle.com/en/database/oracle/oracle-database/20/sqlrf/Database-Object-Names-and-Qualifiers.html#GUID-3C59E44A-5140-4BCA-B9E1-3039C8050C49
All the data dictionary views will show the identifiers as Oracle interprets them. In other words, without quotes everything will be uppercase. I can testify that this is true even for accented characters.
You can't always get what you want...
Related
I would like to add a field with:
ALTER TABLE Table_name ADD COLUMN ABCD012345(en) Memo;
Here is described what to do in that case:
To work arond this problem, do not use special characters. If you must use special characters in query expressions, enclose the special characters in brackets ([]). For example, if you want to use the greater than sign (>), use [>].
As I understand it I would Need to Change it to:
ALTER TABLE Table_name ADD COLUMN ABCD012345[(]en[)] Memo;
But this still leads to the same error: Syntax error in field Definition. If you Need a little more context: I do this with a ADODB.Recordset in a VBA macro.
Where do I go wrong? How can I solve it?
You need to surround the entire name with brackets, not just the special characters:
ALTER TABLE Table_name ADD COLUMN [ABCD012345(en)] Memo;
-- Here --------------------------^--------------^
How to turn off forced upper-case mode for table and column names in HSQL?
<artifactId>hsqldb</artifactId>
<version>2.3.1</version>
OS: Windows 7 x64
The rules around this are explained in the HSQLDB documentation:
When a database object is created with one of the CREATE statements or
renamed with the ALTER statement, if the name is enclosed in double
quotes, the exact name is used as the case-normal form. But if it is
not enclosed in double quotes, the name is converted to uppercase and
this uppercase version is stored in the database as the case-normal
form.
Case sensitivity rules for identifiers can be described simply as
follows:
all parts of SQL statements are converted to upper case before processing, except identifiers in double quotes and strings in single
quotes
identifiers, both unquoted and double quoted, are then treated as case-sensitive
most database engines follow the same rule, except, in some respects, MySQL and MS SQLServer.
AFAIK this behaviour can't be turned off. (It's worth noting that standard SQL is case-insensitive when quoted identifiers aren't used.) But as mentioned above, a lower case identifier can be specified by enclosing in quotes, e.g:
CREATE TABLE "lowercasetablename" ("lowercasecolname" INT);
SELECT "lowercasecolname" FROM "lowercasetablename";
I am not sure, i understand the problem correctly but just trying to put some effort.
SET DATABASE COLLATION SQL_TEXT_UCC
May be you can refer http://hsqldb.org/doc/guide/dbproperties-chapt.html
I was trying to use sqlFetch. The fetch works perfectly when I change the name of my table to have underlines instead of periods. So if I use the command
sqlFetch(conn, "HelloWorld_40")
It works fine. Unfortunately, my friends are all using the real name of the table
sqlFetch(conn, "HelloWorld.40")
But then it crashes and it tells me that
Error in sqlColumns(conn, "HelloWorld.40") :
'HelloWorld.40': table not found on channel
I'm guessing the period "." is illegal name for a table. But I don't want my friends to change it because it's a lot of people who would be affected. Is there a way I can call the table, or do I have to secretly go to their database, change the name while I use it and then change it back to a period (risking that I will forget, someone will read, blah blah).
Thanks.
put the table name in square brackets:
[HelloWorld.40]
It is a problem with sqlFetch which parse table name. Unfortunately it did not handle table quotes, so it's search for table 40 in schema HelloWorld. You need to directly call sqlQuery (with quoted table name, brackets for MS SQL Server):
sqlQuery(dbhandle, "SELECT * FROM [HelloWorld.40]")
Side note: you should specify which database you are using.
The best delimiter is double quotes -- that should work in most underlying databases:
"HelloWorld.40"
In MySQL, you can also use back ticks (`):
`HelloWorld.40`
In SQL Server, Access, and I think Sybase, you can also use square braces:
[HelloWorld.40]
I have created a table with some columns using PL/SQL Develper to access this Oracle database.
After clicking the "Apply" button that will create the table, all my column names suddenly become upper case (which can hardly be read), including the table name!
Would that be possible to configure PL/SQL Developer IDE to leave the columns names and table names as they are?!
Oracle DBMS ignores case and translates everything to uppercase unless you use quotes. But the quotes have the liability that you always have to use them.
If you do not use the quotes you will get an error message ORA-00942: table or view does not exist
You can give column name in double quote "". Then those column name will be in as it is.
UPDATE files
SET filepath = REPLACE(filepath, `sites/somedomain.com/files/`, `sites/someotherdomain.com/files/`);
I have a table called files with a field called filepath. MySQL returns this error: Unknown column 'sites/somedomain.com/files/' in 'field list'
Use normal quotes instead of backquotes: normal quotes identify strings, backquotes identify column names.
To expand on kemp's answer:
Backquotes or backticks ` are used in MySQL to enclose the names of schema objects (databases, tables, columns, indexes, procedures, ...). They cannot be used to enclose strings. You must use regular single- or double-quotes: ' or " for that.
+1 to answers given by #kemp and #Hammerite.
See also my answer to this question: Do different databases use different name quote?