How do I get rid of this sql warning?

Question

Hi folks,
I am running oracle 10.2.0 on Linux. I would like to get rid of this sql code warning
(Warning(151,3): PLW-07202: bind type would result in conversion away from column type)I get when I compile the code below. Basically Oracle does not like the idea of using a number in an expression with sysdate. eg (sampling_date < sysdate - p_n_value) where p_n_value is a number;
What is the best way to do this?
CREATE TABLE "USERDATA"."TBL_SESSION_SQL_WAIT_HISTORY"
   (           "SESSION_SQL_WAIT_HIST_SEQ_ID" NUMBER,
                "DBID" NUMBER,
                "SID" NUMBER,
                "SEQ#" NUMBER,
                "EVENT" VARCHAR2(64 BYTE),
                "P1TEXT" VARCHAR2(64 BYTE),
                "P1" NUMBER,
                "P1RAW" RAW(8),
                "P2TEXT" VARCHAR2(64 BYTE),
                "P2" NUMBER,
                "P2RAW" RAW(8),
                "P3TEXT" VARCHAR2(64 BYTE),
                "P3" NUMBER,
                "P3RAW" RAW(8),
                "WAIT_TIME" NUMBER,
                "SECONDS_IN_WAIT" NUMBER,
                "STATE" VARCHAR2(19 BYTE),
                "SAMPLING_DATE" DATE,
                "SAMPLING_TIME" VARCHAR2(8 BYTE),
                "SERIAL#" NUMBER,
                "USERNAME" VARCHAR2(30 BYTE),
                "OSUSER" VARCHAR2(30 BYTE),
                "PADDR" RAW(4),
                "LOGON_TIME" DATE,
                "PROCESS" VARCHAR2(24 BYTE),
                "SQL_HASH_VALUE" NUMBER,
                "SADDR" RAW(4),
                "MODULE" VARCHAR2(48 BYTE),
                "ROW_WAIT_OBJ#" NUMBER,
                "ROW_WAIT_FILE#" NUMBER,
                "ROW_WAIT_BLOCK#" NUMBER,
                "ROW_WAIT_ROW#" NUMBER
   ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  STORAGE(INITIAL 16384 NEXT 65536 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
  TABLESPACE "USERDATA" ;
  CREATE TABLE "USERDATA"."TBL_SQLTEXT_WAIT_HISTORY"
   (           "SQLTEXT_SEQ_ID" NUMBER,
                "DBID" NUMBER,
                "ADDRESS" RAW(4),
                "HASH_VALUE" NUMBER,
                "SQL_ID" VARCHAR2(13 BYTE),
                "COMMAND_TYPE" NUMBER,
                "PIECE" NUMBER,
                "SQL_TEXT_PIECE" VARCHAR2(64 BYTE),
                "SQL_TEXT" VARCHAR2(1000 BYTE),
                "DISK_READS" NUMBER,
                "BUFFER_GETS" NUMBER,
                "DIRECT_WRITES" NUMBER,
                "PARSE_CALLS" NUMBER
   ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  STORAGE(INITIAL 16384 NEXT 65536 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
  TABLESPACE "USERDATA" ;
create or replace
PROCEDURE data_coll AS
p_n_value userdata.tbl_options.n_value%type;  -- number
BEGIN
-- irrelevant code here
  select n_value into p_n_value from tbl_options where name ='PURGE_DAY_COUNT';
  DELETE FROM tbl_sqltext_wait_history t where t.hash_value in
    (select s.sql_hash_value from cc_session_sql_wait_history s
    where s.sampling_date < sysdate  - p_n_value
    and s.sql_hash_value = t.hash_value);
  DELETE FROM tbl_session_sql_wait_history
  WHERE sampling_date < sysdate - p_n_value;
END;Thanks in advance for your feedback.
rgds, Efachim
Edited by: efachim on Jan 19, 2009 10:44 AM

Answer 1

One general suggestion.
"TBL_SESSION_SQL_WAIT_HISTORY"Did you create your table and column names within double quotes?
It will make your table as case sensitive.
Regards.
Satyaki De.