How to use swivel to cross a tabular report with external business logic

Hello gurus,

I have it here is the Emp_Hist table, which is usually audit table for the Emp table.

For each record, we maintain version whenever it updated there.

ENo EName Sal job DOB Version Tstamp

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

1 Sanjiv 1000 committed 12/10/89 1 02/03/12 13:00

1 Sanjiv 1000 committed 12/10/89 2 02/03/12 14:00

1 Sanjeev 1900 committed 12/10/89 3 02/03/12 15:00

2 Scott 2000 analyst 22/10/85 1 02/05/12 13:00

2 Scott 2000 analyst 22/10/85 2 02/05/12 14:00

2 Scott 3000 lead 22/10/85 3 02/05/12 15:00

Smith 4000 lead 13/11/81 1 3 06/02/12 13:00

Smith 5000 lead 13/11/81 2 3 02/06/12 14:00

3 Smith 5500 lead 13/11/81 3 06/02/12 16:00

3 Smith 8000 CTO 13/11/81 5 02/06/12 17:00

4 Tom 4000 lead 13/11/81 1 02/07/12-13:00

4 Tom 5000 lead 13/11/81 2 07/02/12 14:00

4 Tom 5500 lead 13/11/81 3 02/07/12 15:00

Tom 4 8000 CTO 13/11/81 4 02/07/12-16:00

CREATE

TABLE Emp_Hist

(

ENo NUMBER,

EName VARCHAR2 (20).

SAL NUMBER,

Use VARCHAR2 (20).

DATE OF BIRTH,

Version NUMBER,

Tstamp DATE

);

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (1, 'Sanjiv', 1000, 'Clerk', to_date (December 10, 1989 "," DD-MON-RRRR'), 1, to_date (March 2, 2012 13:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (1, 'Sanjiv', 1000, 'Clerk', to_date (December 10, 1989 "," DD-MON-RRRR'), 2, to_date (March 2, 2012 14:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (1, 'Sanjeev', 1900, 'Clerk', to_date (December 10, 1989 "," DD-MON-RRRR'), 3, to_date (March 2, 2012 15:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (2, 'Scott', 2000, 'Analyst', to_date (October 22, 1985 "," DD-MON-RRRR'), 1, to_date (May 2, 2012 13:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (2, 'Scott', 2000, 'Analyst', to_date (October 22, 1985 "," DD-MON-RRRR'), 2, to_date (May 2, 2012 14:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (2, 'Scott', 3000, 'Lead', to_date (October 22, 1985 "," DD-MON-RRRR'), 3, to_date (May 2, 2012 15:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (3, 'Smith', 4000, 'Lead', to_date (22 October 1981 "," DD-MON-RRRR'), 1, to_date (June 2, 2012 13:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (3, 'Smith', 5000, 'Lead', to_date (22 October 1981 "," DD-MON-RRRR'), 2, to_date (June 2, 2012 14:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (3, 'Smith', 5500, 'Lead', to_date (22 October 1981 "," DD-MON-RRRR'), 3, to_date (June 2, 2012 15:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (3, 'Smith', 8000, 'CTO', to_date (22 October 1981 "," DD-MON-RRRR'), 5, to_date (June 2, 2012 17:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (4, 'Tom', 4000, 'Lead', to_date (22 October 1981 "," DD-MON-RRRR'), 1, to_date (July 2, 2012 13:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (4, 'Tom', 5000, 'Lead', to_date (22 October 1981 "," DD-MON-RRRR'), 2, to_date (2 July 2012 14:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (4, 'Tom', 5500, 'Lead', to_date (22 October 1981 "," DD-MON-RRRR'), 3, to_date (July 2, 2012 15:00 ',' DD-MON-RRRR hh24:mm'));

Insert into EMP_HIST (ENO, ENAME, SAL, JOB, DOB, VERSION)

values (4, 'Tom', 8000, 'CTO', to_date (22 October 1981 "," DD-MON-RRRR'), 4, to_date (July 2, 2012 16:00 ',' DD-MON-RRRR hh24:mm'));

I want to display changes (current value and previous value)

for each column as below.

PK_Value Column_Name Previous_value Current_Value

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

1         ENo                1                        1

1 Ename Sanjiv Sanjeev

1 1000 1900 sal

1 committed post clerk

1 DATE OF BIRTH 12/10/89-12/10/89

2         ENo                2                        2

2 Ename Scott Scott

2 sal 2000 3000

2 senior analyst job

2 DATE OF BIRTH 12/10/89-12/10/89

3         ENo                3                        3

3 Ename Smith Smith

3 5500 8000 sal

3         Job                         Lead                  CTO

3 DATE OF BIRTH 12/10/89-12/10/89

Solution for above requirement is query below.

WITH

got_r_num AS

(

SELECT

Eno,

Ename,

To_char (sal) AS sal,

employment,

To_char (dob, 'DD-MON-YYYY') AS date of birth,

ROW_NUMBER () OVER (PARTITION BY eno ORDER BY version DESC) AS r_num

Of

emp_hist

)

SELECT

*

Of

(got_r_num) PIVOT UNPIVOT (str FOR column_name IN (ename, sal, job, birth date))

MIN (str) FOR r_num IN (2 AS previous_val, 1 AS)

current_val))

ORDER BY

Eno,

Column;

But there are a few changes to the rquirement as below

There is a table that maintains the version the most recent/maximum for each employee.

Table EMP_AUD_LOOKUP have structure below

CREATE

TABLE emp_aud_lookup

(

ENo NUMBER,

Version NUMBER

);

Insert into emp_aud_lookup (ENO, VERSION) values (1.3);

Insert into emp_aud_lookup (ENO, VERSION) values (2,3);

Insert into emp_aud_lookup (ENO, VERSION) values (3.6);

Insert into emp_aud_lookup (ENO, VERSION) values (4.6);

version of Eno

------  -----------

1 3

2 3

3 6

4 6

maximum/later in the EMP_AUD_LOOKUP table.

For emp = 1, version the most recent/maximum is 3

For emp = 2, version the most recent/maximum is 3

For emp = 3, version the most recent/maximum is 6, if it's 5 emp_hist table but the matching record in

Table 6 (since it can be changed in other tables to load of the EMP_AUD_LOOKUP

that is the case has changed in child table thats why he is 6)

For emp = 4, version the most recent/maximum is 6, if it is 4 emp_hist table but the matching record in

Table 6 (since it can be changed in other tables to load of the EMP_AUD_LOOKUP

that is the case has changed in child table thats why he is 6)

Updated the result will be like

PK_Value Column_Name Previous_value Current_Value

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

1         ENo                1                        1

1 Ename Sanjiv Sanjeev

1 1000 1900 sal

1 committed post clerk

1 DATE OF BIRTH 12/10/89-12/10/89

2         ENo                2                        2

2 Ename Scott Scott

2 sal 2000 3000

2 senior analyst job

2 DATE OF BIRTH 12/10/89-12/10/89

3         ENo                3                        3

3 Ename Smith Smith

3 8000 8000 sal

3         Job                         CTO                   CTO

3 DATE OF BIRTH 12/10/89-12/10/89

4         ENo                4                        4

4 Tom Tom Ename

4 8000 8000 sal

4         Job                         CTO                   CTO

4 DATE OF BIRTH 12/10/89-12/10/89

In the case of ENo = 1, will be later

SELECT version in v_latest OF EMP_AUD_LOOKUP where Eno = 1;

v_latest = 3

Latest = > max (version) of emp_hist < = v_latest or 3 < = 3 so 3

Previous = > max (version) of emp_hist < v_latest-1 or 2 < = 2 so 2

In the case of ENo = 2, will be later

SELECT version in v_latest OF EMP_AUD_LOOKUP where Eno = 2;

v_latest = 3

Latest = > max (version) of emp_hist < = v_latest or 3 < = 3 so 3

Previous = > max (version) of emp_hist < v_latest-1 or 2 < = 2 so 2

In the case of ENo = 3, will be later

SELECT version in v_latest OF EMP_AUD_LOOKUP where Eno = 3;

v_latest = 6

Latest = > max (version) of emp_hist < = v_latest or 5 < = 6 so 5

Previous = > max (version) of emp_hist < v_latest-1 is 5 < = 5 so 5

In the case of ENo = 4, will be later

SELECT version in v_latest OF EMP_AUD_LOOKUP where Eno = 4;

v_latest = 6

Latest = > max (version) of emp_hist < = v_latest or 4 < = 6 so 4

Previous = > max (version) of emp_hist < v_latest - 1 = 4 < = 5 so 4

Can we make changes above with a modified respect logic based on the id of the most recent version of the other table.

either we can manipulate in row_number() function.

Hello.. Try the below...

WITH qry1 AS (SELECT eno,

Ename,

SAL,

employment,

Date of birth

Version

Max (version) OVER (PARTITION BY eno) mx_ver

Of emp_hist).

qry2 AS

(SELECT eno1,

To_char (Eno) eno,

Ename,

To_char (SAL) sal,

employment,

Date of birth to_char(DOB,'DD-mon-YYYY'),

To_char (ld_eno) ld_eno,

ld_ename,

To_char (ld_sal) ld_sal,

ld_job,

To_char(DOB,'DD-mon-YYYY') ld_dob

FROM (SELECT q1.eno, eno1,

Q1. Nwe eno,

Ename,

SAL,

employment,

Date of birth

INF. ROW_NUMBER() over (PARTITION BY q1.eno ORDER BY q1.version),

Lead (Q1. Eno, 1, Q1. ENO) OVER (PARTITION BY q1.eno ORDER BY q1.version) ld_eno,.

Lead(Ename,1,Ename) OVER (PARTITION BY q1.eno ORDER BY q1.version) ld_ename,

Lead(SAL,1,SAL) OVER (PARTITION BY q1.eno ORDER BY q1.version) ld_sal,

Lead(Job,1,Job) OVER (PARTITION BY q1.eno ORDER BY q1.version) ld_job,

Lead(DOB,1,DOB) OVER (PARTITION BY q1.eno ORDER BY q1.version) ld_dob,

version Q1.version

OF qry1 q1 emp_aud_lookup eal

WHERE q1.eno = eal.eno

AND (q1.mx_ver = eal.version AND (q1.version = q1.mx_ver OR q1.version = q1.mx_ver - 1))

OR(Q1.mx_ver <> EAL.version and Q1.version = Q1.mx_ver)))

WHERE rn = 1)

SELECT eno1 eno,

CASE WHEN lvl = 1 THEN 'ENO '.

ONCE lvl = 2 THEN 'ENAME '.

ONCE lvl = 3 THEN 'SAL '.

ONCE lvl = 4 THEN "JOB."

ONCE lvl = 5 THEN 'DOB '.

ELSE 'N/A '.

END as col_name,

CASE WHEN lvl = 1 THEN eno

ONCE lvl = 2 THEN ename

ONCE lvl = 3 sal THEN

ONCE lvl = 4 THEN employment

ONCE lvl = 5 THEN dob

END as previous_value,

CASE WHEN lvl = 1 THEN ld_eno

ONCE lvl = 2 THEN ld_ename

ONCE lvl = 3 THEN ld_sal

ONCE lvl = 4 THEN ld_job

ONCE lvl = 5 THEN ld_dob

END AS current_value

OF qry2, (lvl SELECT LEVEL FROM dual CONNECT BY LEVEL<=>

ORDER BY eno, lvl;

OUTPUT:-

-------

ENO COL_N PREVIOUS_VALUE CURRENT_VALUE

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

1 1 1 ENO

1 ENAME Sanjiv Sanjeev

1 1000 1900 SAL

1 committed POST clerk

1 DOB DECEMBER 10, 1989 10 DECEMBER 1989

2 2 2 ENO

2 ENAME Scott Scott

2 SAL 2000 3000

2 senior analyst JOB

2 DATE OF BIRTH 22 OCTOBER 1985 OCTOBER 22, 1985

3 3 3 ENO

3 ENAME Smith Smith

3 8000 8000 SAL

3 USE CTO CTO

3 DATE OF BIRTH 22 OCTOBER 1981 OCTOBER 22, 1981

ENO 4 4 4

4 Tom Tom ENAME

4 8000 8000 SAL

4 JOB CTO CTO

4 DATE OF BIRTH 22 OCTOBER 1981 OCTOBER 22, 1981

20 selected lines.

Tags: Database

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