Null or Blanks records wat is the difference

Hi All,
I have a column which does not have have any value ( Datatype is Char for that column).
I need query which gets update all the records for which the particular column does not have any value..
UPDATE table name SET COL1='ABC' WHERE ITEM LIKE(' ') OR ITEM IS NULL AND EMPID=10001;
i also tried with other syntax item is not null it was not working updating the records .......
Thanks
Ananda
whether this syntax is correct.........

Maybe an example can help you.
create table t(
id number,
name varchar2(10)
insert into t
select 1 id, 'xxx' name from dual union all
select 2 id, null name from dual union all
select 3 id, '' name from dual union all
select 4 id, '    ' name from dual;
select * from t
where name is not null;
select * from t
where name is null;And the output:
Table created.
4 rows created.
        ID NAME
         1 xxx
         4
2 rows selected.
        ID NAME
         2
         3
2 rows selected.Regards,
Miguel

Similar Messages

Wat is the difference in following 3 codes??

wat is the difference in following 3 codes??
1) using write stm in select/endselect block
tables: vbak.
data: begin of t_ernam occurs 10,
 ernam type ernam,
 end of t_ernam.
select ernam from vbak into t_ernam where vbeln = '0000000001'.
write: t_ernam-ernam.
endselect.
2) using write stm separately
tables: vbak.
data: begin of t_ernam occurs 10,
 ernam type ernam,
 end of t_ernam.
select ernam from vbak into t_ernam where vbeln = '0000000001'.
endselect.
loop at t_ernam.
write: t_ernam-ernam.
endloop.
3) using select single
tables: vbak.
data: begin of t_ernam occurs 10,
 ernam type ernam,
 end of t_ernam.
select single ernam from vbak into t_ernam where vbeln = '0000000001'.
loop at t_ernam.
write: t_ernam-ernam.
endloop.
I got the output for the first set of codes only. and dint get any output for the remaining two..
so i wud like to know the difference b/w all..
Regards,
Kalai

2) using write stm separately
tables: vbak.
data: begin of t_ernam occurs 10,
ernam type ernam,
end of t_ernam.
select ernam from vbak into t_ernam where vbeln = '0000000001'.
append t_ernam. " Append is missing here
endselect.
loop at t_ernam.
write: t_ernam-ernam.
endloop.
3)
tables: vbak.
data: begin of t_ernam occurs 10,
ernam type ernam,
end of t_ernam.
select single ernam from vbak into table t_ernam where vbeln = '0000000001'.
write: t_ernam-ernam.
Infact you can represent the code like this.
TABLES: vbak.
DATA: BEGIN OF t_ernam OCCURS 10,
 ernam TYPE ernam,
 END OF t_ernam.
SELECT-OPTIONS : so_vbeln FOR vbak-vbeln.
START-OF-SELECTION.
SELECT ernam FROM vbak
 INTO TABLE t_ernam
 WHERE vbeln IN so_vbeln.
LOOP AT t_ernam.
 WRITE: t_ernam-ernam.
ENDLOOP.
Regards
Gopi

Wat is the difference between Check and Uncheck in SU24?

I am confused since documentation says :
UnCheck(U) :The check for corresponding authorization object is always executed. Field values are not displayed in the Profile Generator.
Check(C):Check always executed. Field values are not displayed in the Profile Generator
Wat is the difference between the two ? Any thoughts delete

Unchecked just means the check indicator has not been set. It should not have an impact on the way the transaction works other than the fact that the object will not be pulled into PG for the given transaction(s) for which it was set to unchecked and thus may not allow a user access.
Your example:
"For instance if you uncheck all the auth objects in a particular TCODE ( u cant do that with HR and Basis objects) then if u add it to a role then the person will not be able to execute anything in that TCODE"
If I was giving a user access to a tcode and I did not want them to perform some of the HR or basis functions I would inactivate the sensitive object(s) within the role. In most cases I would not change the check indicator in SU24 to unchecked. This way when you add the transaction to a user who should have access the object is correctly added.
Personally I would not change the check indicator to C instead of CM to make the role look neater. I would inactivate the object in the role.
Cheers,
Ben

What's the difference between Transferred Records and Added Records?

When right click an ODS or a cube to select Manage, then under the 3rd tab called Requests, there are two columns called Transferred Records and Added Records, what's the difference between these two?
Thanks

Hello KeLviN,
How r u ?
Consider a realtime example.
Assume a transfer of Transactional Data from R/3(with PSA) which is having Unit values in it.
Now, I found in RSA3 2844168 of records. In BW I saw one Data Packet with 306 error records(because of a UNIT value is not available in BW T006 table, Eg. YDD) which are automatically collected in PSA. Now in the Monitor screen you could see 2 Monitor status with GREEN Signals for 2 set of data.
1. with 2843862 records
2. with 306 records
Now, if u manage the Data Target you will get 2844168 in the Transferred Records & 2843862 in the Added Records. and the 306 error records are in the PSA.
Hope this is clear.
Best Regards....
Sankar Kumar
+91 98403 47141

Converting null and blank to NA in a column of a database table

Hi
This is a simple thing but is giving me a hard time. I need to change the values coming as null or blank to NA . The values comes in a flat file as a source and I need to laod it convertign to NA in database. I wrote the expression as
ISNULL([NPS Rating]) ? "NA" : [NPS Rating] in a derived column and checked the box " retain null values from source as null values in data flow:
However it is not working instead giving the error as : Truncation may occur due to inserting data from dataflow column from column name" with a length of ...........
Can any help me to sort out this problem. Am I writing the correct expression?
Thank you so much for your help in advance.
Kind regards
Rama

In your conditional result force it to the same length and type and make sure it is long enough, e.g.
ISNULL([NPS Rating])==TRUE ? (DT_WSTR,256)"NA" : (DT_WSTR, 256)[NPS
Rating]
and if the data comes from a flat file, the test will most likely need to test for zero length string too, or trim spaces and then test for zero length.
LEN(TRIM([NPS Rating])) == 0 || ISNULL...
Jan D'Hondt - SQL server BI development

How to Insert Blank Record in Array?

I assume that I need to insert a blank record into my array
to solve the problems below, but am not sure how to do so.
I have a function shown below that is part of a two selects
related Component. My first problem is if no data is passed to the
argument, the select field bound to the function is very tiny (I
would like it to have a default width). Adding a "width" does not
work.
SECONDLY, if there is data passed to the argument (in
Arguments.accountID, i would like to have a blank record inserted
at the top of the select list results. So in summary, if no data is
passed to the argument, the select field is very small. If data is
passed to the argument, the select list is populated, but I need to
have a blank record (option) at the top of the select list.
The code for the function shown below:
<cffunction name="getUsers" access="remote"
returnType="array">
<cfargument name="accountID" type="string"
required="yes">

<cfset var data="">
<cfset var result=ArrayNew(2)>
<cfset var i=0>
<cfset data1= oSF.QueryObject("select ID , name, Email,
ACCOUNTID__C from User").results>
<cfquery dbtype="query" name="data">
SELECT ID, NAME, ACCOUNTID__C
FROM DATA1
WHERE ACCOUNTID__C = '#arguments.accountID#'
</cfquery>

<cfloop index="i" from="1" to="#data.recordcount#">
<cfset result
[1]=data.id>
<cfset result
[2]=data.name>
</cfloop>

<cfreturn result >
</cffunction>
Code for select list:
<cfselect name="Contacts"
bind="cfc:getPartners.getUsers({mediaid})" tooltip="Select
Partner Rep" onError=""
width="50"/>

1) style="width:50px;"
2)
<cfif data.recordcount>
<cfset result[1][1] = "">
<cfset result[1][2] = "">

<cfloop index="i" from="1" to="#data.recordcount#">
<cfset result[i+1][1]=data.id
>
<cfset result[i+1][2]=data.name>
</cfloop>
</cfif>
hth
Azadi Saryev
Sabai-dee.com
http://www.sabai-dee.com/

What is the difference between VK11 and VK31?

What is the difference between VK11 and VK31?
Thanks in Advance.
Nazim.

Hi,
They are the same really. VK31 came with a later SAP release and some
people say it is easier to use than VK11. In the end they are both used
for condition records.
Actually,the difference between VK11 and VK31 is that VK31,
VK32 ONLY work for standard SAP delivered Condition Types (ex.
PR00). If you create any customer specific Condition Type codes
(ex. ZXXX)you can only create / maintain Condition Records for
them using VK11, VK12.
In VK11 you can store condition record for more than one condition
type. This means you can have same condition record for different condition types.This feature is given to enhance the systems performance and not to create the duplication of the work for each condition type.
BOTH transactions allow mass entry and changes.
Regards,
Sophia Xavier

Whats the difference between ALL and FIRST in Multi Inserting

SQL> Drop Table Sales;
Table dropped.
SQL> Drop Table Accounts;
Table dropped.
SQL> Drop Table Research;
Table dropped.
SQL> Create Table Sales As Select * From Emp;
Table created.
SQL> Create Table Accounts As Select * From Emp;
Table created.
SQL> Create Table Research As Select * From Emp;
Table created.
SQL> Truncate Table Sales;
Table truncated.
SQL> Truncate Table Accounts;
Table truncated.
SQL> Truncate Table Research;
Table truncated.
SQL> Select * From Sales;
no rows selected
SQL> Select * From Accounts;
no rows selected
SQL> Select * From Research;
no rows selected
SQL> Insert All
2 When Deptno=10 Then
3 Into Sales (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
4 When Deptno=20 Then
5 Into Accounts (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
6 When Deptno=30 Then
7 Into Research (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
8 Select * From Emp
9 .
SQL> /
16 rows created.
SQL> Select * From Sales;
 EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
 7782 CLARK MANAGER 7839 09-JUN-81 100 10
 7839 KING PRESIDENT 17-NOV-81 100 10
 7934 MILLER CLERK 7782 23-JAN-82 100 10
 7999 ABCDEFGH JOB 7839 09-FEB-06 100 0 10
4 rows selected.
SQL> Select * From Accounts;
 EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
 7901 SMITH CLERK 7902 17-DEC-80 100 20
 7566 JONES MANAGER 7839 02-APR-81 100 20
 7788 SCOTT ANALYST 7566 19-APR-87 100 20
 7876 ADAMS CLERK 7788 23-MAY-87 100 20
 7902 FORD ANALYST 7566 03-DEC-81 100 20
 123 20
6 rows selected.
SQL> Select * From Research;
 EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
 7499 ALLEN SALESMAN 7698 20-FEB-81 100 300 30
 7521 WARD SALESMAN 7698 22-FEB-81 100 500 30
 7654 MARTIN SALESMAN 7698 28-SEP-81 100 1400 30
 7698 BLAKE MANAGER 7839 01-MAY-81 100 30
 7844 TURNER SALESMAN 7698 08-SEP-81 100 0 30
 7900 JAMES MANAGER 7698 03-DEC-81 100 30
6 rows selected.
SQL> Truncate Table Sales;
Table truncated.
SQL> Truncate Table Accounts;
Table truncated.
SQL> Truncate Table Research;
Table truncated.
SQL> Insert First
2 When Deptno=10 Then
3 Into Sales (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
4 When Deptno=20 Then
5 Into Accounts (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
6 When Deptno=30 Then
7 Into Research (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
8 Select * From Emp
9 /
16 rows created.
SQL> Select * From Sales;
 EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
 7782 CLARK MANAGER 7839 09-JUN-81 100 10
 7839 KING PRESIDENT 17-NOV-81 100 10
 7934 MILLER CLERK 7782 23-JAN-82 100 10
 7999 ABCDEFGH JOB 7839 09-FEB-06 100 0 10
4 rows selected.
SQL> Select * From Accounts;
 EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
 7901 SMITH CLERK 7902 17-DEC-80 100 20
 7566 JONES MANAGER 7839 02-APR-81 100 20
 7788 SCOTT ANALYST 7566 19-APR-87 100 20
 7876 ADAMS CLERK 7788 23-MAY-87 100 20
 7902 FORD ANALYST 7566 03-DEC-81 100 20
 123 20
6 rows selected.
SQL> Select * From Research;
 EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
 7499 ALLEN SALESMAN 7698 20-FEB-81 100 300 30
 7521 WARD SALESMAN 7698 22-FEB-81 100 500 30
 7654 MARTIN SALESMAN 7698 28-SEP-81 100 1400 30
 7698 BLAKE MANAGER 7839 01-MAY-81 100 30
 7844 TURNER SALESMAN 7698 08-SEP-81 100 0 30
 7900 JAMES MANAGER 7698 03-DEC-81 100 30
6 rows selected.Both inserting insert the same records then whats the difference between ALL and FIRST clause in multi insert DML
Khurram Siddiqui
[email protected]

Hello
From the docs:
ALL
If you specify ALL, then Oracle evaluates each WHEN clause regardless of the results of the evaluation of any other WHEN clause. For each WHEN clause whose condition evaluates to true, Oracle executes the corresponding INTO clause list.
FIRST
If you specify FIRST, then Oracle evaluates each WHEN clause in the order in which it appears in the statement. For the first WHEN clause that evaluates to true, Oracle executes the corresponding INTO clause and skips subsequent WHEN clauses for the given row.
ELSE clause
For a given row, if no WHEN clause evaluates to true:
* If you have specified an ELSE clause, then Oracle executes the INTO clause list associated with the ELSE clause.
* If you did not specify an else clause, then Oracle takes no action for that row.
See Also:
"Multitable Inserts: Examples"
Restrictions on Multitable Inserts
* You can perform multitable inserts only on tables, not on views or materialized views.
* You cannot perform a multitable insert into a remote table.
* You cannot specify a table collection expression when performing a multitable insert.
* In a multitable insert, all of the insert_into_clauses cannot combine to specify more than 999 target columns.
* Multitable inserts are not parallelized in a Real Application Clusters environment, or if any target table is index organized, or if any target table has a bitmap index defined on it.
* Plan stability is not supported for multitable insert statements.
* The subquery of the multitable insert statement cannot use a sequence.
So given this the following example shows the difference:
SQL> CREATE TABLE dt_test_insert_base as select rownum id from dba_objects where rownum <=20
2 /
Table created.
SQL> CREATE TABLE dt_test_insert_1 (id number)
2 /
Table created.
SQL> CREATE TABLE dt_test_insert_2 (id number)
2 /
Table created.
SQL>
SQL> INSERT ALL
2 WHEN rownum <=15 THEN
3 INTO dt_test_insert_1 (id)
4 WHEN rownum >=10 THEN
5 INTO dt_test_insert_2 (id)
6 SELECT
7 ID
8 FROM
9 dt_test_insert_base
10 /
26 rows created.
SQL>
SQL> SELECT * from dt_test_insert_1
2 /
 ID
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
15 rows selected.
SQL> SELECT * from dt_test_insert_2
2 /
 ID
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
11 rows selected.
SQL>
SQL> TRUNCATE TABLE dt_test_insert_1
2 /
Table truncated.
SQL> TRUNCATE TABLE dt_test_insert_2
2 /
Table truncated.
SQL>
SQL> INSERT FIRST
2 WHEN rownum <=15 THEN
3 INTO dt_test_insert_1 (id)
4 WHEN rownum >=10 THEN --This condition is ignored until the value of id is > 15
5 INTO dt_test_insert_2 (id)
6 SELECT
7 ID
8 FROM
9 dt_test_insert_base
10 /
20 rows created.
SQL> SELECT * from dt_test_insert_1
2 /
 ID
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
15 rows selected.
SQL> SELECT * from dt_test_insert_2
2 /
 ID
 16
 17
 18
 19
 20HTH
David

Difference betwen Null item,Blank item ,item is zero and empty item

Please describe the difference betwen :
null item
empty item
blank item
and zero item
And how can we test each one?
How to test if the value of an item say Px_y is null or
blank
empty
zero
Regards

Please describe the difference betwen :
null item
empty item
blank item
and zero item
And how can we test each one?
How to test if the value of an item say Px_y is null or
blank
empty
zero
Regards

Blank Record Appearing in Power Pivot, How do I ensure that my Power Query script is filtering out all the Blank Records

Hi,
I noticed once of my Fact tables in my Power Pivot model contains a blank record. I can't understand why.
So I added a Filter expression to the underlying Power Query query, something like; -
Text.Length("MyField") > 0
However after refreshing the Power Query query which contains the above expression the blank record still appears within my Power Pivot table.
Kind Regards,
Kieran.
Kieran Patrick Wood http://www.innovativebusinessintelligence.com http://uk.linkedin.com/in/kieranpatrickwood http://kieranwood.wordpress.com/

hi..
As my understand, the blank record in Power Query will be return null value . So that, You try to use Text.Length("MyField" ) <> null.
Regards,

Wat is the exact differences between clustered table and pooled table

hi,
can you tell me ravi...wat is the exact differences between clustered table and pooled table
with regards//
anilreddyg

Hi Anil Reddy
Pooled Tables, Table Pools, Cluster Tables, and Table Clusters
These types of tables are not transparent in the sense that they are not legible or manageable directly using the underlying database system tools. They are managed from within the R/3 environment from the ABAP dictionary and also at runtime when they are loaded into application memory.Pool and cluster tables are logical tables. Physically, these logical tables are arranged as records of transparent tables. The pool and cluster tables are grouped together in other tables, which are of the transparent type. The tables that group together pool tables are known as table pools, or just pools; similarly, table clusters, or just
clusters, are the tables which group cluster tables.Not all operations that can be performed over transparent tables can be executed over pool or cluster tables.
For instance, you can manage these tables using Open SQL calls from ABAP, but not Native SQL.These tables are meant to be buffered and loaded in memory, because they are commonly used for storing internal control information and other types of data with no external (business) relevance. SAP recommends that tables of pool or cluster type be used exclusively for control information such as
program parameters, documentation, and so on. Transaction and application data should be stored in transparent tables.
Table Pools
From the point of view of the underlying DBMS as from the point of view of the ABAP dictionary, a table pool is a transparent table containing a group of pooled tables which, when created, were assigned to this table pool.
Field Type Description
TABNAME CHAR(10) Table name
VARKEY CHAR(n) Maximum key length n =< 110
DATALN INT2(5) Length of the VARDATA record returned
VARDATA RAW(m) Maximum length of the data varies according to DBMS
Table Clusters
Similarly to pooled tables, cluster tables are logical tables which, when created, are assigned to a table cluster. Therefore, a table cluster, or just cluster, groups together several tables of type clusters.Several logical rows from different cluster tables are brought together in a single physical record. The records
from the cluster tables assigned to a cluster are thus stored in a single common table in the database.A cluster contains a transparent cluster key which must be located at the start of the key of all logical cluster tables to be included in the cluster. As well, a cluster contains a long field (VARDATA), which contains the
data of the cluster tables for this key. If the data does not fit into a field, continuation records are created.
Field Type Description
CLKEY1 CHAR(*) First key fields
CLKEY2 CHAR(*) Second key field
CLKEYN CHAR(*) nth key field
PAGENO INT2(5) Number of the next page
TIMESTMP CHAR(14) Time stamp
PAGELG INT2(5) Length of the VARDATA record returned
VARDATA RAW(*) Maximum length of the data section; varies according to database system
Working with Tables
The dictionary includes many functions for working with tables. There are five basic operations you can perform on tables: display, create, delete, modify, copy. Please do not confuse displaying a table with displaying the table entries (table contents). In order to display a table, it must previously exist; otherwise the system will display an error message in the status bar. For the following example, the table TABNA is used. To display this table, from the main dictionary screen, enter the table name in the Object name
input field with the radio button selected next to Tables. Then, click on the Display button at the bottom of the screen, or press the F7 function key, or, alternatively,
select Dictionary object Display from the menu.
In this screen, you can see table information such as
¨ Table type, shown next to the name of the object. In the example, it is a transparent table.
¨ Short text description.
¨ Name of the user who made the last change, and the date of the change.
¨ Master language.
¨ Table status. On the screen, you can see this table is saved and active.
¨ Development class. For information on development classes, refer to Chap. 6.
Delivery class, which sets the maintenance group for the table. It controls how tables will behave during client copy procedures, upgrades, and so forth.¨
Tab. Maint. Allowed flag, which indicates whether you can generate a screen for maintaining table entries.
¨Then, on the lower part of the screen, you can see the table fields with all associated characteristics such as:
¨ Field name.
¨ Key indicator. When set, this field is the primary key, or part of it.
¨ Data element.
¨ Basic data type.
¨ Length.
¨ Check table.
¨ Short text, describing the field.
Additional information about the table can be displayed by selecting the corresponding functions from the menu or directly from the application toolbar, such as keys, indexes, or technical settings
Standard table:
The key access to a standard table uses a sequential search. The time required for an access is linearly dependent on the number of entries in the internal table.
You should usually access a standard table with index operations.
Sorted table:
The table is always stored internally sorted by its key. Key access to a sorted table can therefore use a binary search. If the key is not unique, the entry with the lowest index is accessed. The time required for an access is logarithmically dependent on the number of entries in the internal table.
Index accesses to sorted tables are also allowed. You should usually access a sorted table using its key.
Hash table:
The table is internally managed with a hash procedure. All the entries must have a unique key. The time required for a key access is constant, that is it does not depend on the number of entries in the internal table.
You cannot access a hash table with an index. Accesses must use generic key operations (SORT, LOOP, etc.).
Index table:
The table can be a standard table or a sorted table.
Index access is allowed to such an index table. Index tables can be used to define the type of generic parameters of a FORM (subroutine) or a function module.
Just have a look at these links:
http://help.sap.com/saphelp_nw04/helpdata/en/90/8d7304b1af11d194f600a0c929b3c3/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/74/83015785d811d295a800a0c929b3c3/frameset.htm
Regards
Sreeni

What is the difference between "= NULL" and "IS NULL" in SQL?

Hi,
I believe there is a difference between "= NULL" and "IS NULL" comparsion, but I couldn't find it. Anyone knows the difference?
Thanks,
Denny

Aha, thanks:
SQL> create table william_test_tab (col binary_double);
Table created.
SQL> insert into william_test_tab
2 select rownum / (rownum - 1) from user_tables where rownum < 4;
select rownum / (rownum - 1) from user_tables where rownum < 4
ERROR at line 2:
ORA-01476: divisor is equal to zero
SQL> insert into william_test_tab
2 select 1d * rownum / (rownum - 1) from user_tables where rownum < 4;
3 rows created.
SQL> select * from william_test_tab;
 COL
 Inf
2.0E+000
1.5E+000
3 rows selected.
SQL> select * from william_test_tab where col is infinite;
 COL
 Inf
1 row selected.
SQL>

What's the difference between a not-initialed object and a null object

hi guys, i wanna know the difference between a not-initialed object and a null object.
for eg.
Car c1;
Car c2 = null;after the 2 lines , 2 Car obj-referance have been created, but no Car obj.
1.so c2 is not refering to any object, so where do we put the null?in the heap?
2.as no c2 is not refering to any object, what's the difference between c2 and c1?
3.and where we store the difference-information?in the heap?

For local variables you can't have "Car c1;" the compiler will complain.That's not true. It will only complain if you try to use it without initializing it.
You can have (never used, so compiler doesn't care):
public void doSomething()
   Car c1;
   System.out.println("Hello");
}or you can have (definitely initialized, so doesn't have to be initialized where declared):
public void doSomething(boolean goldClubMember)
   Car c1;
   if (goldClubMember)
       c1 = new Car("Lexus");
   else
       c1 = new Car("Kia");
   System.out.println("You can rent a " + c1.getMake());
}

What is the difference between string != null and null !=string ?

Hi,
what is the difference between string != null and null != string ?
which is the best option ?
Thanks
user8729783

Like you've presented it, nothing. There is no difference and neither is the "better option".

Whats the difference between arrayCollection = null and arrayCollection.removeAll()?

Whats the difference between arrayCollection = null and
arrayCollection.removeAll()?

In arrayCollection = null; statement you're setting this
reference to null and potentially making it available for garbage
collection. I say 'this reference' and potentially because, as you
may know, there might be other references to this array collection
object that won't be affected by this statement and hence it won't
be GC'ed.
arrayCollection.removeAll() says that I want to empty this
array collection for all the reference that we pointing to it. That
is, remove all the objects from the collection -- and of course
make them 'potentially' available for the GC -- the size of the
array collection would be reduced down to zero and all the
references would be pointing to a valid but empty collection.
Hope this helps.
ATTA

Null or Blanks records wat is the difference

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