How to Get the Previous Working Day From Oracle?

To get the previous working day from Oracle, you can use the expression:

SELECT CASE WHEN TO_CHAR(SYSDATE,'DY','NLS_DATE_LANGUAGE=american')='MON' THEN TRUNC(SYSDATE-3) ELSE TRUNC(SYSDATE-1) END AS PREVIOUS_WORKING_DAY FROM DUAL;

This query uses the CASE statement to check if the current day is Monday, and if it is, subtracts 3 days. Otherwise, it subtracts 1 day to get the previous working day. This query will return the previous working day date.

What is the recommended approach for storing historical data related to previous working days in Oracle?

One recommended approach for storing historical data related to previous working days in Oracle is to use a separate table to store the historical data. This table can contain columns for the relevant data, such as dates, working day indicator, and any other related information.

To populate this table, you can create a script or job that runs daily and inserts the relevant data for the previous working days. You can use Oracle's date functions and conditions to determine whether a day is a working day or not.

Additionally, you can consider using partitioning and indexing to optimize the performance of queries on the historical data table. Partitioning can help with data organization and retrieval efficiency, while indexing can improve query performance.

Overall, using a separate table for storing historical data related to previous working days in Oracle can help you easily access and analyze the data for reporting and other purposes.

What is the process for scheduling jobs based on the previous working day in Oracle?

In Oracle, you can schedule jobs based on the previous working day by creating a job in the Oracle Database Scheduler. Here is the general process to schedule jobs based on the previous working day:

1. Connect to the Oracle Database using SQL Developer or any other database tool.
2. Create a job using the DBMS_SCHEDULER package. You can use the following SQL commands to create a job that runs on the previous working day:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10

BEGIN
  DBMS_SCHEDULER.CREATE_JOB (
    job_name           => 'your_job_name',
    job_type           => 'PLSQL_BLOCK',
    job_action         => 'BEGIN your_plsql_code_here; END;',
    start_date         => trunc(sysdate) - case when to_char(sysdate, 'D') = 2 then 3 else 1 end,
    repeat_interval    => 'FREQ=DAILY; BYDAY=MON,TUE,WED,THU,FRI; BYHOUR=desired_hour; BYMINUTE=desired_minute',
    enabled            => TRUE
  );
END;

1. Modify the your_plsql_code_here with the PL/SQL code you want to run in the job. Replace desired_hour and desired_minute with the specific time you want the job to run on the previous working day.
2. Execute the SQL command to create the job. The job will now be scheduled to run on the previous working day at the specified time.
3. You can view and manage the scheduled job using the DBA_SCHEDULER_JOBS view in Oracle.

Overall, you can create a job in Oracle Database Scheduler to run on the previous working day by setting the start date conditionally based on the current day of the week. By using the FREQ=DAILY; BYDAY=MON,TUE,WED,THU,FRI in the repeat_interval parameter, you can make sure the job runs only on weekdays.

What is the purpose of getting the previous working day in Oracle database systems?

The purpose of getting the previous working day in Oracle database systems is to perform various data analysis and reporting tasks that require information from the previous day. This can include tasks such as generating daily reports, monitoring transactional data, and analyzing trends and patterns in the data. By getting the previous working day, users can ensure that they have up-to-date and accurate information for their analysis and decision-making processes.