data from 3 tables with later dates

Hello
Need help with the PL/SQL code, I need to write a code that will get the data from 3 tables with the most recent date.

For an individual ACT_CODE the output of the SQL query should display the data including the last dates back to 3 tables, if there is no
Date of the table, it should show the remaining data (think that the left join will do here)

Names of tables:
Institution_UPDT aiu
AC ASQ_CONTACT
GR_AUTHORIZE gr

All 3 tables have ACT_Code in common

Column names

INSTITUTION_UPDT IAU - IAU. ACT_CODE, AIU.project_id as proj, IAU. UPDT_TYPE_ID, IAU. User_id, IAU. UPDT_DATE

ASQ_CONTACT ac - ac. ACT_CODE as contact_code, ac.project_id, ac.first_name, ac.middle_initial, ac.last_
Name, AC.title, AC. Status, AC.status_date

GR_AUTHORIZE gr - GR ACT_CODE as grad_code, gr.name, gr.title AS grad_title, gr.submit_date

Are the names of the columns date
AC.status_date,
IAU. UPDT_DATE and
Gr.submit_date

Thanks to you all
appreciate your help

Jesh

Hi, Ngoumba,

If a given ACT_Code couldn't miss from any of the tables, then you will use better full outer joins, not a join left outer.

Perhaps it would be more effective to make a UNION of the three tables, then rotate the results in three datecolumns.

You can use the GROUP BY aggregation to get the last date for each ACT_Code in each table.
If you need other columns in the row which is the last date, you can use the ROW_NUMBER analytic function, like this:

SELECT  ACT_Code
,     updt_date
,     ROW_NUMBER () OVER ( PARTITION BY  ACT_Code
                          ORDER BY          updt_date     DESC
                  ) AS r_num
FROM    institution_updt

The lines with r_num = 1 are the most recent

This is a technique of ot the UNION-PIVOT example:

WITH     union_data     AS
(
     SELECT    ACT_Code
     ,       MAX (updt_date)     AS last_date
     ,       1                  AS table_id
     FROM       institution_updt
     GROUP BY  ACT_Code
UNION ALL
     SELECT    ACT_Code
     ,       MAX (status_date)     AS last_date
     ,       2                  AS table_id
     FROM       ASQ_Contact
     GROUP BY  ACT_Code
UNION ALL
     SELECT    ACT_Code
     ,       MAX (submit_date)     AS last_date
     ,       3                  AS table_id
     FROM       GR_Authorize
     GROUP BY  ACT_Code
)
SELECT       ACT_Code
,       MAX (CASE WHEN table_id = 1 THEN last_date END)     AS aiu_updt_date
,       MAX (CASE WHEN table_id = 2 THEN last_date END)     AS ac_status_date
,       MAX (CASE WHEN table_id = 3 THEN last_date END)     AS gr_submit_date
FROM       union_data
GROUP BY  ACT_Code
ORDER BY  ACT_Code
;

Published by: Frank Kulash, on September 16, 2009 15:02
Added UNION-pivot example

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