DELETE Statements [SOLVED]

This is simple question.
I have 1 big table. select * from big_table requires a lot of time.
Then I delete some records on big_table. delete from big_table where no > 1000.
Thus the table size has reduced significantly. However when I select again using select statement above. The query still take a long time.
Why?
When I truncate the big_table with drop storage option. Then insert the big_table with records that saved previously. Then it runs quickly.
Question how to use DELETE statements that drop storage? Is DELETE statements doesnt release the storage?
regards n thanks
Message was edited by:
user465837+++eric

No. DELETE does not release storage that is already allocated to a table. It just makes those blocks available on the free list of blocks for that segment.
However, the high water mark for that segment is reset ONLY by the truncate/MOVE commands (DROP also is useful but not always ;)).
Since FTS against such tables is going to scan all the rows below the HWM, it is bound to take time when a table is cleaned up using DELETE command.

Similar Messages

Oracle deadlocks on delete statement

I had a package procedure that deletes from a inline-view. It worked well and didn't create any database locks, looked like this:
PROCEDURE serverdisconnect(pCode1 NUMERIC, pCode2 NUMERIC) IS
BEGIN
     DELETE FROM
        SELECT cl.* FROM CurrentLogins cl, Accounts a
        WHERE cl.Code1 = pCode1
        AND cl.Code2 = pCode2
        AND cl.Code = a.code
        AND a.Type = 'lplayer'
        ORDER BY a.code
    COMMIT;
END serverdisconnect;I slightly changed the procedure to look like following, and deadlocks started to come:
PROCEDURE ServerDisconnect(pCode1 NUMERIC, pCode2 NUMERIC, pChannelServerCode CurrentLogins.ChannelServerCode%TYPE, pDeleteList OUT cursor_type)
IS
    vDeleteList sys.ODCINumberList;
BEGIN
    DELETE FROM
        SELECT cl.* FROM CurrentLogins cl, Accounts a
        WHERE cl.Code1 = pCode1
       AND cl.Code2 = pCode2
       AND cl.Code = a.code
       AND cl.ChannelServerCode = pChannelServerCode
       AND cl.Code = a.code
       AND a.Type = 'lplayer'
    ) RETURNING Code
      BULK COLLECT INTO vDeleteList;
    OPEN pDeleteList FOR
      SELECT * FROM TABLE(vDeleteList);
    COMMIT;
END ServerDisconnect;As you see the main difference in the delete statement is that i removed "ORDER BY"-clause? Can really such data ordering plays a role with dead locking? Does the data records be always ordered with ORDER-BY-clause same way always to avoid deadlock? Why i started to get deadlock after changing the procedure?
I have Oracle 10g.

Yes, typo, i fixed initial post now.
Delete will be technically done on table CurrentLogins, using that inline-view.
I will move the Commit to proper place as you suggested.
but still i don't understand why deadlocks started to occure.
Maybe really the answer is having "order by" clause, which solves the deadlocks?
See this link:
http://www.oracle-base.com/articles/misc/Deadlocks.php
>
To resolve the issue, make sure that rows in tables are always locked in the same order.
>
Does it says that i always have to have "order by" sentence included into my delete statement?
Relationships between tables:
alter table CURRENTLOGINS
add constraint FK_CURRENTLOGINS_ACCOUNTS foreign key (CODE)
references ACCOUNTS (CODE);Maybe ORDER-BY really solves deadlocks then, see:
http://www.dbasupport.com/forums/archive/index.php/t-50438.html
>
Add an explicit ORDER BY to the select, and it will probably go away.
>
Edited by: CharlesRoos on Sep 9, 2010 6:05 AM

Missing privilege - DELETE statement in procedure

Hello experts,
I am facing a problem for my procedure. I am not able to active the procedure if I use DELETE statement in the produce. When I use only selects, it is working fine. The SYSTEM user has access to the schema with full rights, including DELETE.
PROCEDURE "SYSTEM"."DEV_COL.procedures::FI" ( )
LANGUAGE SQLSCRIPT
SQL SECURITY INVOKER
DEFAULT SCHEMA UXX790
AS
BEGIN
Write your procedure logic
-- SELECT vbeln
--count(*)
DELETE
from vbapold
where erdat < ADD_days(now(), -1700);
END;
Did anybody had the same issue? I run HANA rev70.
BR
Tamas

Hi Tamas
if this is a repository procedure user _SYS_REPO has to have the DELETE privilege with grant option as well.
- Lars

Delete statement evaluation

Hi People,
I have the following delete statement i'm trying to execute. i get ORA-923 error. Please review and comment.
DELETE FROM INACTIVE_ORDERS IO WHERE IO.REQ_NUM IN (SELECT REQ_NUM SRINI_ARCHIVE_VIEW) OR
IO.REQ_NUM IN (SELECT REQ_NUM FROM SRINI_CHILD_VIEW);

Seems like a simple syntax error; should be:
DELETE FROM INACTIVE_ORDERS IO WHERE IO.REQ_NUM IN (SELECT REQ_NUM FROM SRINI_ARCHIVE_VIEW) OR
IO.REQ_NUM IN (SELECT REQ_NUM FROM SRINI_CHILD_VIEW);

Delete Statement Exception Handling

Hi guys,
I have a problem in my procedure. There are 3 parameters that I am passing into the procedure. I am matching these parameters to those in the table to delete one record at a time.
For example if I would like to delete the record with the values ('900682',3,'29-JUL-2008') as parameters, it deletes the record from the table but then again when I execute it with the same parameters it should show me an error message but it again says 'Deleted the Transcript Request.....' Can you please help me with this?
PROCEDURE p_delete_szptpsr_1 (p_shttran_id IN saturn.shttran.shttran_id%TYPE,
p_shttran_seq_no IN saturn.shttran.shttran_seq_no%TYPE,
p_shttran_request_date IN saturn.shttran.shttran_request_date%TYPE) IS
BEGIN
DELETE FROM saturn.shttran
WHERE shttran.shttran_id = p_shttran_id
and shttran.shttran_seq_no = p_shttran_seq_no
and trunc(shttran_request_date) = trunc(p_shttran_request_date);
DBMS_OUTPUT.PUT_LINE('Deleted the Transcript Request Seq No (' || p_shttran_seq_no || ') of the Student (' || p_shttran_id ||') for the requested date of (' || p_shttran_request_date ||')');
COMMIT;
EXCEPTION WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE('Error: The supplied Notre Dame Student ID = (' || p_shttran_id ||
'), Transcript Request No = (' || p_shttran_seq_no || '), Request Date = (' || p_shttran_request_date || ') was not found.');
END p_delete_szptpsr_1;
Should I have a SELECT statement to use NO_DATA_FOUND ???

A DELETE statement that deletes no rows (just like an UPDATE statement that updates no rows) is not an error to Oracle. Oracle won't throw any exception.
If you want your code to throw an exception, you'll need to write that logic. You could throw a NO_DATA_FOUND exception yourself, i.e.
IF( SQL%ROWCOUNT = 0 )
THEN
RAISE no_data_found;
END IF;If you are just going to catch the exception, though, you could just embed whatever code you would use to handle the exception in your IF statement, i.e.
IF( SQL%ROWCOUNT = 0 )
THEN
<<do something about the exception>>
END IF;In your original code, your exception handler is just a DBMS_OUTPUT statement. That is incredibly dangerous in real production code. You are relying on the fact that the client has enabled output, that the client has allocated a large enough buffer, that the user is going to see the message, and that the procedure will never be called from any piece of code that would ever care if it succeeded or failed. There are vanishingly few situations where those are safe things to rely on.
Justin

Delete statement: how to get count of affected rows in a variable

Hi folks
I write a proc which deletes data from bunch of table based on data value. i want to produce a report which will have 1 line for each table like:
Del: Table name : number of rows
I parse delete statement into variable and use execute immediate. I know I could precede delete by select count(*) using the same criteria. Is there any more effective way to catch output from execution of 'delete' itself to avoid an overhead of running select count(*)?
Thank you, Gene.

Gene,
I thought you said you wanted to have the number of rows deleted. In that case, see Sänjay's example above.
Btw, is there a particular reason that you are using EXECUTE IMMEDIATE (?)
To have it in a variable
declare
   v_rows_deleted number;
begin
   delete from emp;
   v_rows_deleted := SQL%ROWCOUNT;
end ;Regards
Peter
Edited by: Peter on Jul 23, 2009 7:48 AM
Added example

How to delete the data from KNVP without using the delete statement

Hello friends,
I have a requirement that I have to delete the data from KNVP table without using any delete statement. For it I have to use the Standard BAPI or any standard program.
Can you please tell me the name of the standard program or BAPI to delete the data .
Thanks in Advance
Kuldeep

Hello Raymond,
I have use the function 'CUSTOMER_UPDATE' in which I only gives the data in T_XKNVP table only but still the data is not get deleting. Please see the code below.
=============================================================
REPORT ZK_TEST2                                .
data :
    I_KNA1     LIKE     KNA1,
    I_KNB1     LIKE     KNB1,
    I_KNVV     LIKE     KNVV,
    I_YKNA1     LIKE     KNA1,
    I_YKNB1     LIKE     KNB1.
Data :
T_XKNAS       LIKE     FKNAS occurs 0,
T_XKNB5     LIKE     FKNB5 occurs 0,
T_XKNBK     LIKE     FKNBK occurs 0,
T_XKNVA     LIKE     FKNVA occurs 0,
T_XKNVD     LIKE     FKNVD occurs 0,
T_XKNVI     LIKE     FKNVI occurs 0,
T_XKNVK     LIKE     FKNVK occurs 0,
T_XKNVL     LIKE     FKNVL occurs 0,
T_XKNVP     LIKE     FKNVP occurs 0 with header line,
T_XKNVS     LIKE     FKNVS occurs 0,
T_XKNEX     LIKE     FKNEX occurs 0,
T_XKNZA     LIKE     FKNZA occurs 0,
T_YKNAS     LIKE     FKNAS occurs 0,
T_YKNB5     LIKE     FKNB5 occurs 0,
T_YKNBK     LIKE     FKNBK occurs 0,
T_YKNVA     LIKE     FKNVA occurs 0,
T_YKNVD     LIKE     FKNVD occurs 0,
T_YKNVI     LIKE     FKNVI occurs 0,
T_YKNVK     LIKE     FKNVK occurs 0,
T_YKNVL     LIKE     FKNVL occurs 0,
T_YKNVP     LIKE     FKNVP occurs 0 with header line,
T_YKNVS     LIKE     FKNVS occurs 0,
T_YKNEX     LIKE     FKNEX occurs 0,
T_YKNZA     LIKE     FKNZA occurs 0.
T_XKNVP-KUNNR     =     '7000002648'     .
*T_XKNVP-VKORG     =     '0001'     .
*T_XKNVP-VTWEG     =     '01'     .
*T_XKNVP-SPART     =     '01'     .
T_XKNVP-KZ      =     'D'     .
append T_XKNVP to T_XKNVP.
CALL FUNCTION 'CUSTOMER_UPDATE'
EXPORTING
    I_KNA1        = I_KNA1
    I_KNB1        = I_KNB1
    I_KNVV        = I_KNVV
    I_YKNA1       = I_YKNA1
    I_YKNB1       = I_YKNB1
TABLES
    T_XKNAS       = T_XKNAS
    T_XKNB5       = T_XKNB5
    T_XKNBK       = T_XKNBK
    T_XKNVA       = T_XKNVA
    T_XKNVD       = T_XKNVD
    T_XKNVI       = T_XKNVI
    T_XKNVK       = T_XKNVK
    T_XKNVL       = T_XKNVL
    T_XKNVP       = T_XKNVP
    T_XKNVS       = T_XKNVS
    T_XKNEX       = T_XKNEX
    T_XKNZA       = T_XKNZA
    T_YKNAS       = T_YKNAS
    T_YKNB5       = T_YKNB5
    T_YKNBK       = T_YKNBK
    T_YKNVA       = T_YKNVA
    T_YKNVD       = T_YKNVD
    T_YKNVI       = T_YKNVI
    T_YKNVK       = T_YKNVK
    T_YKNVL       = T_YKNVL
    T_YKNVP       = T_YKNVP
    T_YKNVS       = T_YKNVS
    T_YKNEX       = T_YKNEX
    T_YKNZA       = T_YKNZA
=============================================================

Delete Statement is not working correctly

Hello,
The following delete statement is not working correctly.
If I press delete it will delete everything in the category table
I don't know whats wrong with it.
----delete row from category if there is not infrastructure to support------
IF :P12_DFCY_SEQNO4 IS NOT NULL AND :P12_DFCY_CATG_C = '7' THEN
DELETE FROM DFCY_CATG
WHERE NOT EXISTS(SELECT I.DFCY_SEQNO
FROM DFCY_CATG C, DFCY_CATG_INFRSTRCTR I
WHERE C.DFCY_SEQNO = I.DFCY_SEQNO
AND :P12_DFCY_SEQNO4 = I.DFCY_SEQNO);
end if;
Thanks
Mary

Hi,
IF :P12_DFCY_SEQNO4 IS NOT NULL AND :P12_DFCY_CATG_C = '7' THEN
DELETE FROM DFCY_CATG
WHERE NOT EXISTS(SELECT I.DFCY_SEQNO
FROM DFCY_CATG C, DFCY_CATG_INFRSTRCTR I
WHERE C.DFCY_SEQNO = I.DFCY_SEQNO
AND :P12_DFCY_SEQNO4 = I.DFCY_SEQNO);
end if;So, if P12_DFCY_SEQNO4 does not exist, then I would expect all records to be deleted because the NOT EXISTS() function would just return TRUE for every record on the table. Somewhere in the statement, I would expect to see something that links between the table being deleted from and the NOT EXISTS() data or, perhaps, using the P12_DFCY_CATG_C value as a filter?
Andy

Delete statement is not working.

Hi,
find the code. Here the delete statement is not working and i am getting sy-subrc = 4. although ,
xe1edp10-idnkd = 34596 and dint_edidd -sdata = 34596.
please help me ...
loop at dekek_x.
loop at dint_edidd where segnam = 'E1EDP10'.
if dekek_x-stpin = 1 .
CLEAR xe1edp10.
MOVE dint_edidd-sdata TO xe1edp10.
delete dint_edidd where sdata = xe1edp10-idnkd.
endif.
endloop.

1st thing..
i tried this :
tables: edidd, e1edp10.
edidd-sdata = '315934 EA 017'.
WRITE edidd-sdata.
move edidd-sdata to e1edp10.
IF edidd-sdata = e1edp10-idnkd.
WRITE: e1edp10-idnkd.
else.
WRITE: 'nothing'.
ENDIF.
output
>315934 EA 017
>315934 EA 017
2nd thing,.
your loop inside loop doesnt make any sense as they are not related any where.
3rd thing:
the fields are not type compatible.. this might be the reason for wrong delete statement..
and 1 more clarification:
TABLES: edidd, e1edp10.
DATA :it TYPE TABLE OF edidd WITH HEADER LINE.
edidd-sdata = '315934 EA 017'.
WRITE edidd-sdata.
APPEND edidd TO it.
edidd-sdata = '315934 EA 018'.
APPEND edidd TO it.
LOOP AT it." where segnam = 'E1EDP10'.
CLEAR e1edp10.
MOVE it-sdata TO e1edp10.
DELETE it WHERE sdata = e1edp10-idnkd.
ENDLOOP.
in this also delete is working perfectly fine... you run and check..

Delete statement that uses a sub-select with the statement in the cursor

Hi all,
How to write write a delete statement that uses a sub-select with the statement in the cursor?
CURSOR excluded_dates IS
       SELECT TO_TIMESTAMP(report_parameter_value, in_date_format_mask)
      INTO my_current_date_time
      FROM report_parameters
     WHERE report_parameters.report_parameter_id    = in_report_parameter_id
       AND report_parameters.report_parameter_group = 'DATE_TIME'
       AND report_parameters.report_parameter_name = 'EXCLUDED_DATE';
OPEN excluded_dates;
LOOP
    FETCH excluded_dates INTO my_excluded_date;
    EXIT WHEN excluded_dates%NOTFOUND;
    DELETE FROM edr_rpt_tmp_inclusion_table
    WHERE TO_CHAR(date_time, 'mm/dd/yyyy') = TO_CHAR(my_excluded_date, 'mm/dd/yyyy');
END LOOP;
CLOSE excluded_dates;Thanks

Hi,
In such case I think is better to create a view an perform the delete using it. Example (using HR schema):
Connected to Oracle Database 10g Express Edition Release 10.2.0.1.0
Connected as hr
SQL> create or replace view v_employees as select * from employees where first_name like 'J%';
View created
SQL> select * from v_employees;
EMPLOYEE_ID FIRST_NAME           LAST_NAME                 EMAIL                     PHONE_NUMBER         HIRE_DATE   JOB_ID         SALARY COMMISSION_PCT MANAGER_ID DEPARTMENT_ID
        110 John                 Chen                      JCHEN                     515.124.4269         28/09/1997 FI_ACCOUNT    8200,00                       108           100
        112 Jose Manuel          Urman                     JMURMAN                   515.124.4469         07/03/1998 FI_ACCOUNT    7800,00                       108           100
        125 Julia                Nayer                     JNAYER                    650.124.1214         16/07/1997 ST_CLERK      3200,00                       120            50
        127 James                Landry                    JLANDRY                   650.124.1334         14/01/1999 ST_CLERK      2400,00                       120            50
        131 James                Marlow                    JAMRLOW                   650.124.7234         16/02/1997 ST_CLERK      2500,00                       121            50
        133 Jason                Mallin                    JMALLIN                   650.127.1934         14/06/1996 ST_CLERK      3300,00                       122            50
        139 John                 Seo                       JSEO                      650.121.2019         12/02/1998 ST_CLERK      2700,00                       123            50
        140 Joshua               Patel                     JPATEL                    650.121.1834         06/04/1998 ST_CLERK      2500,00                       123            50
        145 John                 Russell                   JRUSSEL                   011.44.1344.429268   01/10/1996 SA_MAN       14000,00           0,40        100            80
        156 Janette              King                      JKING                     011.44.1345.429268   30/01/1996 SA_REP       10000,00           0,35        146            80
        176 Jonathon             Taylor                    JTAYLOR                   011.44.1644.429265   24/03/1998 SA_REP        8600,00           0,20        149            80
        177 Jack                 Livingston                JLIVINGS                  011.44.1644.429264   23/04/1998 SA_REP        8400,00           0,20        149            80
        181 Jean                 Fleaur                    JFLEAUR                   650.507.9877         23/02/1998 SH_CLERK      3100,00                       120            50
        186 Julia                Dellinger                 JDELLING                  650.509.3876         24/06/1998 SH_CLERK      3400,00                       121            50
        189 Jennifer             Dilly                     JDILLY                    650.505.2876         13/08/1997 SH_CLERK      3600,00                       122            50
        200 Jennifer             Whalen                    JWHALEN                   515.123.4444         17/09/1987 AD_ASST       4400,00                       101            10
16 rows selected
SQL> delete from v_employees where hire_date >= to_date('01/06/1998', 'dd/mm/yyyy');
2 rows deleted
SQL> regards,

Looping delete statement where table name is coming from another table

Hi All,
We have to write code to delete records from active tables of WDSO.We have 5 DSO so inspite of writing delete statement for each table we want to put all table names into one table and then loop through it .but we are getting error when we are refering that table field which has active table name.error is :
"dictionary structure or table is either not active or does not exist "
As per my understanding in a delete /select /insert /update statement we need to put table name (whose field we are refering ) it can't be replaced by a variable .
ex: v_table = 'EMPLOYEE' .
DELETE FROMv_table WHERE EMP_NAME = 'ABDC' .
is wrong and it must be like
ex : DELETE FROM EMPLOYEE WHERE EMP_NAME = 'ABDC' .
but we want to make our code dynamic .
Can you please suggest a way so that we can read the table names from another table and delete data based on some selection fom those tables .
I tried variants ,perform etc and even searched FM for the same but not found a solution .Your help will be greatly appreciated .
Thanks in advance .
Regards,
Jaya

Hi,
You can change your statement as follows:
DELETE FROM (v_table) WHERE EMP_NAME = 'ABDC' .
However, I would not recommend this. There is a standard function module RSAN_ODS_DATA_DELETE which allows selective deletion - that should be a safer way to do this. You can

Converting a delete statement using VPD policies and context

Hello,
I'm trying to convert a delete statement in a update statement using VPD policies and context.
+/* Supose the user 'user1' already exists. This is an application user */+
conn user1/pwd
create table user1.test_a (
id                number(4),
description       varchar2(100),
deleted           number(1)
+);+
alter table user1.test_a add constraint test_a_pk primary key (id);
insert into user1.test_a (1, 'abc', 0);
insert into user1.test_a (2, 'def', 0);
commit;
I'd like to convert each physical deletion into a logical deletion: statements like "delete from user1.test_a where id = 1" must be converted into "update user1.test_a set deleted = 1 where id = 1".
I've found the following way: I will create a policy to avoid physical deletion. Additionally, the policy function should update the deletion flag too.
conn user1/pwd
+/* Create context package */+
create or replace package user1.pkg_security_context is
procedure p_set_ctx(
i_test_a_id      in   user1.test_a.id   %type
+);+
end;
+/+
create or replace package body user1.pkg_security_context is
procedure p_set_ctx (
i_test_a_id      in   user1.test_a.id   %type
+) is+
begin
dbms_session.set_context( 'user1_ctx', 'test_a_id', i_test_a_id );
end;
end;
+/+
show errors
+/* Create trigger to set the context before deletion */+
create or replace trigger user1.test_a_bef_trg
before delete on user1.test_a
for each row
declare
pragma autonomous_transaction;
begin
-- only commits the preceding update, not the delete that fired the trigger.
commit;
user1.pkg_security_context.p_set_ctx( :old.id );
end;
+/+
show errors
create context user1_ctx using user1.pkg_security_context;
+/* Policy function */+
create or replace function user1.f_policy_chk_dels (
object_schema in   varchar2,
object_name   in   varchar2
+) return varchar2+
is
out_string                 varchar2(400)   default '1=2 ';
+/*+
* out_string is the return value.
* - 'WHERE 1=2' means 'nothing to access'
begin
if ( loc_logged_usr_authorized > 0 ) then
+/*+
* Set the flag deleted to 1
update user1.test_a set deleted = 1 where id = sys_context( 'user1_ctx', 'test_a_id' );
out_string := out_string || 'or 1=1 ';
end if;
return out_string;
end;
+/+
show errors
+/*+
* Create policy
begin
dbms_rls.add_policy(
object_schema   => 'user1'                   ,
object_name     => 'test_a'                  ,
policy_name     => 'policy_chk_dels'         ,
function_schema => 'user1'                   , -- function schema
policy_function => 'f_policy_chk_dels'       , -- policy function
statement_types => 'DELETE'
+);+
end;
+/+
When I try to delete a record of the table test_a:
conn user1/pwd
SQL> delete from ilogdia.oplsimulaciones sim       where sim.id = 9999;
+0 rows deleted+
No rows has been deleted, but the update stmt does not work. That means, the "deleted" flag has not been updated.
Any ideas?
Thank you in advance.
Marco A. Serrano
Edited by: albrotar on Oct 15, 2012 8:42 AM
Edited by: albrotar on Oct 15, 2012 8:42 AM
Edited by: albrotar on Oct 15, 2012 8:43 AM

The policy function is applied once per statement execution. The policy function executes first and the UPDATE statement, presumably, updates no rows because the context is not yet populated. The row-level populates the context (I'm assuming that your session can even see context values populated by an autonomous transaction-- I would guess it could but I'd have to test that) after the UPDATE statement is already complete. The COMMIT in the row-level trigger is also pointless-- it only applies to changes made by the current autonomous transaction, of which there are none-- it cannot apply to changes made in other autonomous transactions. Declaring the row-level trigger to use autonomous transactions doesn't seem to accomplish anything other than to open the question of whether the values set in the context by the autonomous transaction are visible in the caller's transaction.
Even if this, somehow, did work, using autonomous transactions would be a very bad idea since Oracle is free to roll-back a partially executed statement (and the work done by its triggers) and re-execute it. Oracle does that with some regularity to maintain write consistency.
Justin

Verification on delete statement

Hi
i need a verification on delete statement and am trying to execute this delete using prepareStatement and through parameter passing
the code is given below.plz do let me know the problem with the statement
=============================================================
public int delete(String tableName,String empName){
          int n=0;
          System.out.println("Starting!!!delete");
          try{
               /*stmnt=con.createStatement();
               stmnt.executeUpdate("delete from Employees where Name= 'jaggu'");*/
               stmt=con.prepareStatement("delete from ? where Name = ? ");
               stmt.setString(1, tableName);
               stmt.setString(2, empName);
               n=stmt.executeUpdate();
          System.out.println("Deletion Done!!!");
          }catch(Exception e){
               System.out.println("Error on deletion :"+e);
          return n;
===========================================================
the error being displayed is:
Error on deletion :java.sql.SQLException: Syntax error or access violation, message from server: "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''' where Name = ''' at line 1"
PLZ DO LET ME KNOW WHAT IS WRONG HERE!!!

yes tat was the problem and now i got it rectified.. for more dynamisation u can use the following code. If so u can delete any row based on the column value from any table...plz tell whether its looking fine or not:
     public int delete(String tableName,String empName){
          int n=0;
          System.out.println("Starting!!!delete");
          try{
               stmt=con.prepareStatement("delete from "+tableName+" where name = ?");
               stmt.setString(1, empName);
               n=stmt.executeUpdate();
          System.out.println("Deletion Done!!!");
          }catch(Exception e){
               System.out.println("Error on deletion :"+e);
          return n;
     }

Problem with delete statement

Hi there, I have created this code below. The select statement works, however the delete statement does not work.
DECLARE
@CategoryASVARCHAR(255)
DECLARE
@NameASVARCHAR(255)
DECLARE
@Name1ASVARCHAR(255)
DECLARE
@ParentTypeAsint
SET
@Category='General
Building Data'
SET
@Name='Purchase
Date'
SET
@Name1='Purchase
Cost'
Set
@ParentType=20
Select
*fromtbAttributeValueA
Join
tbAttributeTemplateDefinitionLinkATDLONATDL.AttributeTemplateDefinitionLinkID=A.AttributeTemplateDefinitionLinkID
Join
tbAttributeTemplateDefinitionATDONATD.AttributeTemplateDefinitionID=ATDL.AttributeTemplateDefinitionID
JOIN
tbAttributeSetSONS.AttributeSetID=ATDL.LinkedParentID
Where
S.ParentType=@ParentType
AND
S.Name=@Category
AND
([email protected]=@Name1)
AND
A.Value=0
delete
fromtbAttributeValueA
Join
tbAttributeTemplateDefinitionLinkATDLONATDL.AttributeTemplateDefinitionLinkID=AttributeTemplateDefinitionLinkID
Join
tbAttributeTemplateDefinitionATDONATD.AttributeTemplateDefinitionID=ATDL.AttributeTemplateDefinitionID
JOIN
tbAttributeSetSONS.AttributeSetID=ATDL.LinkedParentID
Where
S.ParentType=@ParentType
AND
S.Name=@Category
AND
([email protected]=@Name1)
AND
A.Value=0
The delete statement fails on the first join. Incorrect Syntax near 'A'. What am I doing wrong? As I have only changed the select * to delete. So therefore does this mean I need to put the delete statement into a
sql sub query? Or is there another way of doing this?

Try this:
DELETE FROM tbAttributeValue
FROM tbAttributeTemplateDefinitionLink ATDL
JOIN tbAttributeValue t
ON ATDL.AttributeTemplateDefinitionLinkID = t. AttributeTemplateDefinitionLinkID
JOIN tbAttributeTemplateDefinition ATD
ON ATD.AttributeTemplateDefinitionID = ATDL.AttributeTemplateDefinitionID
JOIN tbAttributeSet S
ON S.AttributeSetID = ATDL.LinkedParentID
WHERE S.ParentType = @ParentType
AND S.NAME = @Category
AND ( ATD.NAME = @Name
OR ATD.NAME = @Name1 )
AND A.Value = 0

Help on delete statement

hi
I need to maintain records in a table1 only latest 2 records .
remaining i nee to delete
can any one help me out in delete statement
Table1 contains below columns
empno deptno lastupdatedate

The below query will delete all the rows except the 2 latest record -
DELETE TABLE1
WHERE (EMPNO, DEPTNO, LASTUPDATEDATE) NOT IN (
SELECT EMPNO, DEPTNO, LASTUPDATEDATE
FROM (SELECT EMPNO, DEPTNO, LASTUPDATEDATE
FROM TABLE1
ORDER BY LASTUPDATEDATE DESC)
WHERE ROWNUM <= 2);
There is similar thread already answered for this. You can refer the below link -
Performing Top-N Analysis

DELETE Statements [SOLVED]

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