Parameters for substr and dbms_lob.substr

The syntax for substr in SQL functions and for the function in dbms_lob package is not matching and hence confusing for programmers. It will be less confusing if parameters for both functions are of the same order.
In Sql functions the the syntax for substr is substr(string, offset, amount)
In dbms_lob package the syntax for the substr function is dbms_lob.substr(lob_loc, amount, offset)
Mohan

I think he wants to send a suggestion to Oracle via this forum.

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Is there a performance gain by dropping the "dbms_lob."?
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From the manual.
The SUBSTR functions return a portion of string, beginning at character position, substring_length characters long. SUBSTR calculates lengths using characters as defined by the input character set. SUBSTRB uses bytes instead of characters. SUBSTRC uses Unicode complete characters. SUBSTR2 uses UCS2 code points. SUBSTR4 uses UCS4 code points.
If position is 0, then it is treated as 1.
If position is positive, then Oracle Database counts from the beginning of string to find the first character.
If position is negative, then Oracle counts backward from the end of string.
If substring_length is omitted, then Oracle returns all characters to the end of string. If substring_length is less than 1, then Oracle returns null.
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After looking at your structure which is comma separated and doesn't have any keyfields it will be difficult to content convert it into different nodes like header and item.
I was looking at using fixed field lenght's along with field separator to split the structure, as the first 4-5 fields of u r row seem to be standard structures which will have fixed length, but then your last field "receiving point" is not a of fixed length.
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Since in your scenario looks like you are creating one sales order per row of file, the above structure should do the job for you.
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Why substring and not subString?

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Substr and instr for long column

Plesae need support ,how can use instr and substr function for column with long datatype
select substr(rec,1,(instr(rec,'?',1))) from F_DE_O_HISTORY_QUEUE_PRE_TST2
rec column is long,When execute this select message displayed as ORA-00932: inconsistent datatypes: expected NUMBER got LONG

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SQL> desc t;
Name                                      Null?    Type
X                                                  NUMBER(38)
Y                                                  LONG
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Table created.
SQL> desc tmp;
Name                                      Null?    Type
X                                                  NUMBER(38)
Y                                                  CLOBEdited by: P. Forstmann on 19 janv. 2010 12:42

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SEVERE     43     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:ORA-00600: internal error code, arguments: [qctosop:like transform], [], [], [], [], [], [], []
SEVERE     44     114     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     45     7     oracle.dbtools.db.DBUtil     Closed Connection
SEVERE     46     9     oracle.dbtools.db.DBUtil
SEVERE     47     1     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     48     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     49     5     oracle.dbtools.db.DBUtil     Closed Connection
SEVERE     50     0     oracle.dbtools.db.DBUtil
SEVERE     51     1     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     52     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     53     5     oracle.dbtools.db.DBUtil     Closed Connection
SEVERE     54     0     oracle.dbtools.db.DBUtil
SEVERE     55     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     56     1     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     57     4     oracle.dbtools.db.DBUtil     Closed Connection
SEVERE     58     0     oracle.dbtools.db.DBUtil
SEVERE     59     1     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     60     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     61     4     oracle.dbtools.db.DBUtil     Closed Connection
SEVERE     62     1     oracle.dbtools.db.DBUtil
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SEVERE     64     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     65     5     oracle.dbtools.db.DBUtil     Closed Connection
SEVERE     66     0     oracle.dbtools.db.DBUtil
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SEVERE     68     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
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SEVERE     70     0     oracle.dbtools.db.DBUtil
SEVERE     71     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
SEVERE     72     0     oracle.dbtools.raptor.nls.OracleNLSProvider     Error loading nls:Closed Connection
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Parameters for substr and dbms_lob.substr

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