Generating a 'WHERE' clause using a function

Hi, I have provided,

given the function at the bottom are input parameters.

sk_func (salary, dept_no, Job, hire_date)

whatever input is given these entries should be there in a statement,

For example if I contribute as

Select double sk_func(5000,null,null,null);

I need output where salary = 5000;

If I give as

Select double sk_func(5000,null,'Programmer',null);

I need output to where salary = 5000 and job = 'program';

Hope am clear,

In short that never values are non-null, those all should include in my where clause.

I know how to do it, but in light of the considerations, am finding the best way to do it,

Thanks for your answers,

I could do that

CREATE OR REPLACE FUNCTION get_where_clause_for_emp_req (
   emp_id IN NUMBER,
   salary IN NUMBER,
   job    IN VARCHAR2,
   dept   IN NUMBER
)
   RETURN VARCHAR2
IS
   l_where_clause   VARCHAR2 (2000) := 'WHERE 1=1 ';
BEGIN
  IF emp_id is not null THEN
    l_where_clause := l_where_clause || 'AND emp_id = ' || emp_id || ' ';
  END IF;

  IF salary is not null THEN
    l_where_clause := l_where_clause || 'AND salary = ' || salary || ' ';
  END IF;

  IF job is not null THEN
    l_where_clause := l_where_clause || 'AND job = ' || job || ' ';
  END IF;

  IF dept is not null THEN
    l_where_clause := l_where_clause || 'AND dept = ' || dept || ' ';
  END IF;

  RETURN l_where_clause;
END;

Tags: Database

Similar Questions

T/t with the WHERE clause using a list breaks

Hello, all,.
I have a project where I need to use a list as part of the WHERE clause for a t/t, and it is breaking. I don't know what I'm doing wrong.
For some pseudo-code, do I have a complete query of a database called 'people '. A list of values for the t/t with the first query; the second query is my t/t:
```
<cfquery name="getDIR" datasource="#request.THISDSN#">
    SELECT thisName dir FROM orgs WHERE thisID in (<cfqueryparam value="#form.org#" cfsqltype="cf_sql_varchar" list="yes" />)
</cfquery>

<cfquery name="people" database="people">
    SELECT colA, colB, colC, colD
    FROM people
    WHERE 1=1
        AND (
            div IN (<cfqueryparam value="#valueList(getDIR.dir)#" cfsqltype="varchar" list="yes" />)
            OR dir IN (<cfqueryparam value="#valueList(getDIR.dir)#" cfsqltype="varchar" list="yes" />)
            )
</cfquery>
```
I get the error message is "t/t syntax error: encountered" div IN \'thisValue\' ".» Incorrect conditional expression, waiting for one of [as | null | between | in | comparison] condition. »
Can support _not_ QoQ lists of WHERE clauses?
V/r,
^_^

SMH - so much... I just found.

I forgot to give the lists in the second query bracket.

(The pseudocode was manually typed, since my dev system is isolated from the internet, and I added the in my pseudo code when they were not in my original code.)

* headdesk * headdesk * headdesk * headdesk *.

V/r,

^_^

Where clause using dblink
Dear friends,

Is there a way to access some of the columns using dblink but without using the quotes?

and also where clause without use of quote?

Please guide me

Thank you very much

Nith
user645399 wrote:
But is it possible to access Oracle's SQL Server using dblink without quotes to select columns?

YES, it is possible, but the table names and column names must be UPPERCASE only

module_data where clause using globals.site.dateNow

I try (and the failing) to get a list of blog posts which exclude her is not yet published messages, here's what I have:
"{module_data resources ="blogposts' version = "v3" field = "siteId, blogId, postTitle, id, createBy, release date, createDate, active, deleted, disableComments, slug, postUrl, metaBlogPostTitle, lastUpdateDate, metaBlogPostDescription" Skip = "0" limit = "10" where="\{'blog.releaseDate':\{'$lt':'{{globals.site.dateNow}}'\}\}" order = ""-id "collection ="myData"}"
The works of 'queries', but he doesn't know the globals.site.dateNow and displays everything (including higher today poles).
If I make a larger than (in test), it does not display anything, it should only display posts unpublished.
Bug? User error? Incorrect formatting? Advice would be great.

Hi rich,

In your 'where' filter above, you use, "blog.releaseDate", if you want to filter the data based on the messages blog release date, then use "release date" only. Like that.

where="\{'releaseDate':\{'$lt':'{{Globals.site.dateNow}}'\}\}.

Let me know if you need additional information on this.

- Abhishek Maurya

ViewObject where Clause SET based on logged in user roles

Hello Experts
I have a view object based on a custom query to get distinct values from a table. My requirement is to display the results as a listview. The listview is is filled without any problem. But I need to add a where clause clause the object view based on the user roles.
I have a method that generates the where clause and returns one string something like "COUNTRIES ('USA', 'UK').
I created a class of the view object Impl and put WhereClause as below: but where clause is not applied when I run the page. I see everywhere instead of just USA & UK.
Can you let me know at what time should I set the where the clause?
SerializableAttribute public class CountriesVOImpl extends ViewObjectImpl {}
/**
* This is the default constructor (do not remove).
*/
public CountriesVOImpl () {}
this.setWhereClause (getCountries ());
}
public String getCountries() {}
return '('USA', 'UK') COUNTRIES. "
}
}

In class ViewImpl try to replace "executeQueryForCollection" and setWhereClause in this function as:
```
    protected void executeQueryForCollection(Object object, Object[] object2, int i)
    {
        setWhereClause("COUNTRY in ('USA','UK')");
        super.executeQueryForCollection(object, object2, i);
    }
```

How to use a function in a Where Clause?
Hello
I have a doubt. If MY_FUNCT is a function that returns a Boolean value, can I use in a where clause clause to write a query like this? :

Select...
table one
where the...
*...*
and MY_FUNC (a.field) = true
*...*
*;*

Thank you!

Published by: Mark1970 on 3.27 lug-2-2010
But is it possible that the function does not return a Boolean value?

Yes (as sysdate, substr and instr etc.) you can also use your own function in a where clause clause, as long as it does not return a BOOLEAN value.

I mean how to use a function in a where clause clause?

Your own pseudocode seems a good example for me.
So, just give it a try.

Trouble using a function in the where clause
Hello

I use a function that is located at ask.tom.oracle.com, which converts a long data type in a character. The function returns an error when it is placed in the where clause. The sql statement, the error message and the function of asking tom are listed below. Does anyone know how to fix this?

< pre >

SELECT A.FLDPHYSICAL,
A.FLDEXPOSURE,
A.FLDDATEDUE,
A.FLDDATELAST,
A.FLDEMPLOYEE,
B.FLDBDATE,
B.FLDMAILSTOP,
B.FLDREC_NUM,
B.FLDLNAME,
B.FLDMI,
B.FLDFNAME,
B.FLDBDATE,
B.FLDDEPT,
B.FLDSTATUS,
B.FLDSSN,
B.FLDHOMEPHON,
B.FLDWORKPHON,
B.FLDID,
B.FLDDIVISION

OF REQEXAM,.
B OF THE EMPLOYEE,
C EMPLOYEE_MEMO
WHERE A.FLDEMPLOYEE = B.FLDREC_NUM
AND b.flduserstr = c.fldrec_num
AND OHM_PKG. GET_LONG ('EMPLOYEE_MEMO', 'FLDDATA', C.ROWID) AS ' % CDL YES % '.
"AND A.FLDDATEDUE > 1 January 1900"
AND A.FLDPHYSICAL = 'COP '.
ORDER OF B.FLDDIVISION,
B.FLDLNAME,
B.FLDFNAME,
B.FLDMI,
A.FLDDATEDUE

-------------------------------------------------------------------------
The error message

Error in the command line: 26 column: 4
Error report:
SQL error: ORA-00904: "OHM_PKG." "" GET_LONG ": invalid identifier
00904, 00000 - '% s: invalid identifier '.

-------------------------------------------------------

create or replace
PACKAGE OHM_PKG AS

/ * TODO type (types, exceptions, methods etc.) package declarations here * /.
getlong function (p_tname in varchar2, p_cname in varchar2, p_rowid in rowid) return varchar2;

END OHM_PKG;

create or replace
PACKAGE BODY OHM_PKG AS

getlong function (p_tname in varchar2, p_cname in varchar2, p_rowid in rowid) return varchar2 as
whole l_cursor default dbms_sql.open_cursor;
number of l_n;
l_long_val varchar2 (4000);
number of l_long_len;
number of l_buflen: = 4000;
l_curpos number: = 0;
Start
DBMS_SQL. Parse (l_cursor,
"select" | p_cname | 'from ' | p_tname |
' where rowid =: x',.
DBMS_SQL.native);
DBMS_SQL.bind_variable (l_cursor, ': x', p_rowid);

DBMS_SQL.define_column_long (l_cursor, 1);
l_n: = dbms_sql.execute (l_cursor);

If (dbms_sql.fetch_rows (l_cursor) > 0)
then
DBMS_SQL.column_value_long (l_cursor, 1, l_buflen, l_curpos,)
(l_long_val, l_long_len);
end if;
DBMS_SQL.close_cursor (l_cursor);
Return l_long_val;
getLong end;

END OHM_PKG;

< / prev >
Remove the '_' in the name of the function as below:

AND OHM_PKG. GETLONG('EMPLOYEE_MEMO', 'FLDDATA', C.ROWID) AS "CDL % YES % '.

Using the index function in where clause of Exchange.

Hello friends,

I need your help with a problem.

I have a query that uses two table Say T1 and T2, where C1 is common column with which both are joined.
C1 is the primary key in T1, but no index available in Q2 for the C1. T1C2 is the column that we want to select.
(Note that table may be a Master table)

Now let's see the query:
Select T1C2
From T1, T2
where T2. C1 = T1. C1

Here where the clause may have other conditions and From clause can have other tables as needed.

I want to know that if I have change the query as continuation of leave my query to use the index available of T1. C1.

Select T1C2
from T1, T2
where T1. C1 = T2.C1

Then, the query uses the index available of T1. and I get better performance. Even a small improvement of performance help me much because this type of query is used in a loop where clause (so it will be run several times).

Please advise on this...

Kind regards
Lifexisxnotxsoxbeautiful...

Hello

18:43:17 rel15_real_p>create table t1(c1 number primary key, c2 number);

Table created.

18:43:26 rel15_real_p>create table t2(c1 number, c2 number);

18:45:08 rel15_real_p>
18:45:09 rel15_real_p>begin
18:45:09   2  for i in 1..100
18:45:09   3  loop
18:45:09   4        insert into t1(c1,c2) values (i,i+100);
18:45:09   5  end loop;
18:45:09   6  commit;
18:45:09   7  end;
18:45:09   8  /

PL/SQL procedure successfully completed.

18:45:09 rel15_real_p>
18:45:09 rel15_real_p>
18:45:09 rel15_real_p>begin
18:45:09   2  for i in 1..100
18:45:09   3  loop
18:45:09   4        insert into t2(c1,c2) values (i,i+200);
18:45:09   5  end loop;
18:45:09   6  commit;
18:45:09   7  end;
18:45:09   8  /

18:45:23 rel15_real_p>select count(*) from t1;

  COUNT(*)
----------
       100

18:45:30 rel15_real_p>select count(*) from t2;

  COUNT(*)
----------
       100

18:45:49 rel15_real_p>select index_name,index_type from user_indexes where table
_name='T1';

INDEX_NAME                     INDEX_TYPE
------------------------------ ---------------------------
SYS_C0013059                   NORMAL

18:48:21 rel15_real_p>set autotrace on
18:52:25 rel15_real_p>Select T1.C2
18:52:29   2  From T1, T2
18:52:29   3  where T2.C1 = T1.C1
18:52:29   4  /

        C2
----------
       101
       102
       103
       104
       105
  .....
  ......

        C2
----------
       200

100 rows selected.

Execution Plan
----------------------------------------------------------
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=7 Card=100 Bytes=
          900)

   1    0   HASH JOIN (Cost=7 Card=100 Bytes=3900)
   2    1     TABLE ACCESS (FULL) OF 'T1' (TABLE) (Cost=3 Card=100 By
          es=2600)

   3    1     TABLE ACCESS (FULL) OF 'T2' (TABLE) (Cost=3 Card=100 By
          es=1300)

Statistics
----------------------------------------------------------
          0  recursive calls
          0  db block gets
         21  consistent gets
          0  physical reads
          0  redo size
       1393  bytes sent via SQL*Net to client
        562  bytes received via SQL*Net from client
          8  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
        100  rows processed

18:52:31 rel15_real_p>analyze table t1 compute statistics;

Table analyzed.

18:55:35 rel15_real_p>analyze table t2 compute statistics;

18:55:38 rel15_real_p>set autotrace on
18:55:42 rel15_real_p>Select T1.C2
18:55:43   2  From T1, T2
18:55:45   3  where T2.C1 = T1.C1
18:55:46   4  /

        C2
----------
       101
       102
       103
       104
       105

  .....
  ......

        C2
----------
       200

100 rows selected.

Execution Plan
----------------------------------------------------------
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=6 Card=100 Bytes=7
          00)

   1    0   MERGE JOIN (Cost=6 Card=100 Bytes=700)
   2    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (TABLE) (Cost=2 Ca
          rd=100 Bytes=500)

   3    2       INDEX (FULL SCAN) OF 'SYS_C0013059' (INDEX (UNIQUE)) (
          Cost=1 Card=100)

   4    1     SORT (JOIN) (Cost=4 Card=100 Bytes=200)
   5    4       TABLE ACCESS (FULL) OF 'T2' (TABLE) (Cost=3 Card=100 B
          ytes=200)

Statistics
----------------------------------------------------------
          1  recursive calls
          0  db block gets
         23  consistent gets
          0  physical reads
          0  redo size
       1393  bytes sent via SQL*Net to client
        562  bytes received via SQL*Net from client
          8  SQL*Net roundtrips to/from client
          1  sorts (memory)
          0  sorts (disk)
        100  rows processed

18:56:56 rel15_real_p>Select T1.C2
18:56:56   2  From T1, T2
18:56:56   3  where T1.C1 = T2.C1
18:56:58   4  /

        C2
----------
       101
       102
       103
       104
       105

  .....
  ......

        C2
----------
       200

100 rows selected.

Execution Plan
----------------------------------------------------------
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=6 Card=100 Bytes=7
          00)

   1    0   MERGE JOIN (Cost=6 Card=100 Bytes=700)
   2    1     TABLE ACCESS (BY INDEX ROWID) OF 'T1' (TABLE) (Cost=2 Ca
          rd=100 Bytes=500)

   3    2       INDEX (FULL SCAN) OF 'SYS_C0013059' (INDEX (UNIQUE)) (
          Cost=1 Card=100)

   4    1     SORT (JOIN) (Cost=4 Card=100 Bytes=200)
   5    4       TABLE ACCESS (FULL) OF 'T2' (TABLE) (Cost=3 Card=100 B
          ytes=200)

Statistics
----------------------------------------------------------
          1  recursive calls
          0  db block gets
         23  consistent gets
          0  physical reads
          0  redo size
       1393  bytes sent via SQL*Net to client
        562  bytes received via SQL*Net from client
          8  SQL*Net roundtrips to/from client
          1  sorts (memory)
          0  sorts (disk)
        100  rows processed

-Pavan Kumar N

function defined by the user in where clause
Hello

Please let me know how to use user-defined in the where clause. I need to use the function that returns the date for dateid.
It generates the error...
```
SELECT To_char(fnc_get_date_for_dateid(a.postdateid),'DD-MON-YYYY') transaction_date,
       SUM(A.points) POINTS_OR_MILES_CREDITED,
       SUM(CASE WHEN a.points is null THEN a.transactionamount ELSE a.points END),              
FROM   accrual a
JOIN   datecal dc ON dc.dateid = a.postdateid  
join   MemberALL m on m.memberid = a.memberid
WHERE a.awardnumber IS NULL
  AND a.accrualtype = 'B'
GROUP BY To_char(fnc_get_date_for_dateid(a.postdateid),'DD-MON-YYYY')
ORDER BY a.postdateid;
```
Error
```
ORA-00979: not a GROUP BY expression
00979. 00000 -  "not a GROUP BY expression"
```
Thank you
Sandy
Hi Sandy,

Have you tried like
===========================

SELECT To_char (fnc_get_date_for_dateid (a.postdateid), 'DD-MON-YYYY') transaction_date,.
Sum (A.points) POINTS_OR_MILES_CREDITED,
SUM (CASE WHERE the a.points is null THEN a.transactionamount ELSE a.points END),
The ACCRUAL one
JOIN dc datecal ON dc.dateid = a.postdateid
Join MemberALL m on m.memberid = a.memberid
WHERE a.awardnumber IS NULL
AND a.accrualtype = 'B '.
GROUP BY a.postdateid - To_char (fnc_get_date_for_dateid (a.postdateid), 'DD-MON-YYYY')
ORDER BY a.postdateid;
==========================

Thank you
Slokam

Optimize query with function in where clause

Hello
I have a query like this:
```
SELECT * FROM table_1 t
WHERE
(
-- Clause A (very long clause that filters a lot of rows)
)
AND f(t.field) = 'Y' -- This function is heavy but it should filter few rows
```
This query, it is very slow because I think he's trying to evaluate f() for all rows in table_1.
Howerver, if I have database query:
```
SELECT f(t.field) FROM table_1 t
WHERE
(
-- very long clause that filters a lot of rows
)
```
It's very fast.
How can I reference the query to filter the lines of division A, then by function?
Thanks in advance!

If you wrap the function in a select clause then the optimizer can use a scalar subquery caching:

SELECT * FROM table_1 t

WHERE ( -- Clause A (very long clause that filters a lot of rows) )

AND (Select f(t.field) From Dual) = 'Y' -- This function is heavy but it should filter few rows

Using cfif in a where clause clause

Hi all
This question is somewhat related to a previous post of mine on the polling dates. I'm trying to use a cfif statement in my where clause to determine if a field is empty or not. Here is the code:
< cfquery name = "GetPastEvents" datasource = "DSN" >
SELECT *.
SITE: calendar
WHERE DatePart ("yyyy", [StartDate]) = < cfqueryparam value = ' #Dateformat (Today, 'yyyy') # "cfsqltype = 'CF_SQL_DATE' / >
and < cfif EndDate NEQ "> < cfelse > StartDate, EndDate < / cfif > < < cfqueryparam value =" "#Today #" cfsqltype = 'CF_SQL_DATE' / > "
and Archive = < cfqueryparam value = '0' cfsqltype = "CF_SQL_INTEGER" / >
ORDER BY StartDate ASC, StartTime ASC
< / cfquery >
My question that this CF tells me EndDate is not defined. EndDate is a field in the SITE table: calendar. There must be a way to make this work, no? Thank you!

You mix the ColdFusion variables (required by cfif) and SQL column names. Think of it this way, all CF tags and function run before the SQL query is sent to SQL server. You are this mixture and try to run CF instruction on SQL Server and thus fail.

You need something like this:

SELECT *.

SITE: calendar

WHERE DatePart ("yyyy", [StartDate]) =

and)

(enddate is not null and EndDate <> )

or (enddate is null and StartDate <> )

)

and Archive =

ORDER BY StartDate ASC, StartTime ASC

Also, I think your logic cfif was back. Instead of NEQ I think you meant EQ because having an EndDate EQ "and then comparing EndDate until today (else clause) makes no sense.

Using a CASE statement in 'IN' where clause clause

Hello
I have a form that users see after they connect with a few items and they type or select values based on the element type. All reports in the application use these values of PAGE 1 in where clause to filter the lines.
One of these question is "Quarter". I have a group of radio buttons on the PAGE 1 on the P1_QTR point.
I need to provide users a way to take the last 4, last 3, last 2 or current quarter and I need to dynamically build a clause WHERE the interactive report based on the selection in the form.
I am trying to use the CASE as shown below and get the syntax error.
AND QTR to (when BOX: P1_QTR = 'CURRENT' then ("T4"))
When: P1_QTR = "LAST" then ("Q3")
When: P1_QTR = 'LAST TWO' then ('Q3, "Q4")
When: P1_QTR = 'LAST THREE' then ("Q2", "Q3,' T4 ')
another ("T1", "T2", "Q3,' T4 ')
END)
How can I achieve this?

Following a simple logic, try

and QTR to

(

Select 'T4' double where: P1_QTR <> 'LAST '.

Union of all the

Select 'Q3' to double where: P1_QTR <> "in PROCESS".

Union of all the

Select "Q2" double where: P1_QTR not in ('CURRENT', 'LAST', "LAST TWO")

Union of all the

Select "Q1" double where: P1_QTR not in ('CURRENT', 'LAST', 'LAST TWO', 'THREE LATEST')

)

Using decode in where clause

Hello
I need to use decode condition in where clause in such a way that if the respective column is null then consider the corresponding column
for example
Fee_date Fee_refund_date
10 OCTOBER 05
12 NOVEMBER 05
11 JANUARY 06
16 FEBRUARY 06
I have a request in place as below where p_fee_flag will be passed as either FEES or set to null, I check another condition as if p_fee_flag is null then fee_date must be set to null when comparing fee_refund_date between TRUNC (BKT. ACT_START_DATE) AND TRUNC (BKT. ACT_END_DATE
SELECT 1
BUCKET BKT
WHERE DECODE (P_FEE_FLAG, 'FEES', TRUNC(FS.) FEE_DATE), TRUNC (FS. FEE_REFUND_DATE))
BETWEEN TRUNC (BKT. ACT_START_DATE) AND TRUNC (BKT. ACT_END_DATE)

944524 wrote:

Hello Alberto,.

Thank you that's what I ask but is it possible to verify the condition even using decode

Yes, it is possible, but why?

Just replace the query in this way:
```
select *
  from fee_table f
where exists(select 1
                from bucket b
              where decode(:p_fee_flag, 'FEE', f.fee_date, f.fee_refund_date) between b.act_start_date and b.act_end_date)
  and decode(:p_fee_flag, 'FEE', null, f.fee_date) is null;
```
Kind regards.

Alberto

Order columns (which make up the primary key constraint) matter in where clause of DML query for use of indexing mechanism to operate.

Version of DB: database Oracle 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production

I have a table my_table as below:
create table my_table
(
my_code varchar2 (6).
my_id varchar2 (24).
forced pk_1 primary key (my_code, my_id)
);

Primary_key here's a composite key that contains columns 1 (my_code) and 2 (my_id).
Is there that a difference in the way below queries is executed in terms of performance (use of indexing in the extraction).
(a) select * from my_table where my_code = '123' and my_id = "456";
(b) select * from my_table where my_id = '456' and my_code = '123';

The understanding I have the order of the column in the where clause should be identical to the sequence in
What primary key draws for indexing to be used by oracle in oracle other DML queries ignores indexing
However when I used explain plain both show the same query cost with single scan with index rowid.
so I don't know if I'm wrong in the concept that I have. Kindly help.
Thanks in advance,
Gerard

Your question is answered in the Performance Tuning Guide

Using indexes and clusters

14.1.4 choosing composite indexes
A composite index contains several key columns. Composite indexes can provide additional benefits compared to the index to single column:
- Improved selectivity
  
  Sometimes the two or more columns or expressions, each with a low selectivity can be combined to form a composite with a high selectivity.
- Reduced IO
  If all columns selected by a query are a composite index, then Oracle may return these values in the index without access to the table.
A SQL statement can use a path on a composite index if the statement contains constructions that use a main part of the index.

Note:

This is no longer the case with the skip index scans. See "Index Skip Scans".

A main part of an index is a set of one or more columns that have been specified first and consecutively in the list of columns in the CREATE INDEX statement that created the index.

By using a WHERE clause in the tree APEX

Hi all -
I have a hierarchical SQL query that I display as a tree of the APEX.
Here is my sample application:
https://Apex.Oracle.com/pls/Apex/f?p=32581:29
Login: guest
PW: app_1000
workspace: leppard
I try to add a WHERE clause so that only nodes with the lowest-level children are displayed, i.e. something like "WHERE connect_by_isleaf = 0 OR level = 5'"
The tree of query with where clause works very well in the SQL command window, but when I add the WHERE clause to my tree apex page no longer displays anything. Is this a problem with APEX or y at - it another way to filter my results?
Thanks in advance for your suggestions,
John

Connect occurs in the first place, the where the provision is applied to these results, effectively cutting in the hierarchical structure. Since the apex has build a hierarchical structure of the query, it relies on the virtual level, which is butchered by applying the where clause. It's a miracle that you're not even receive errors because I expect almost an incorrect json array was built. With no top-level from and only level 5 or end nodes, there is no structure to present: the two apex cannot set a correct representation and not jstree neither. In your request, you will see your "root nodes", but it is not representable.

I don't know why you want to present it in a tree? Levels both connect_by_is_leaf = 5 will give you everything just a list of nodes without any hierarchical structure.

The best thing to do is to use a subquery to limit first your dataset and then use it for the basic tree query, this way you violate one of these vital columns.

For example if you want only nodes and their immediate parent, you can opt for something like this (fast on some testdata model):
```
with dataset as (
select node_id, parent_id
   from treedata
  where connect_by_isleaf = 0
connect by prior node_id = parent_id
  start with parent_id = 0
),
dataset2 as (
select node_id, parent_id
  from dataset
union all
select node_id, null parent_id
  from treedata
where node_id in (select parent_id from dataset)
)
select level, node_id
   from dataset2
connect by prior node_id = parent_id
  start with parent_id is null
```

Fee_date	Fee_refund_date
10 OCTOBER 05
12 NOVEMBER 05
	11 JANUARY 06
	16 FEBRUARY 06

Generating a 'WHERE' clause using a function

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