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How to Delete the Odd Rows Of A Table In Oracle?

4 minutes read

To delete the odd rows of a table in Oracle, you can use a subquery to select the odd rows and then delete them based on their rowid. You can achieve this by first selecting the odd rows using a subquery with the MOD function to identify odd rows, and then using the DELETE statement with the rowid in the WHERE clause to delete those rows. Make sure to backup your data before deleting any rows to avoid unintended data loss.


How to delete alternate rows in Oracle?

You can delete alternate rows in Oracle by using a combination of the ROWID pseudo column and the MOD function.


Here is an example query to delete alternate rows from a table named 'your_table':

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DELETE FROM your_table 
WHERE ROWID IN 
(SELECT ROWID 
FROM (SELECT ROWID, 
ROW_NUMBER() OVER (ORDER BY ROWID) rn 
FROM your_table)
WHERE MOD(rn, 2) = 0);


This query uses a subquery to assign row numbers to each row in the table and then filters out the alternate rows using the MOD function. The rows with even row numbers will be deleted.


Please make sure to replace 'your_table' with the actual name of your table. Also, it is recommended to take a backup of your data before running this query to prevent any data loss.


What is the command to remove odd rows in Oracle?

You can remove odd rows in Oracle by using the following SQL query:

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DELETE FROM (
  SELECT rowid, row_number() OVER (ORDER BY NULL) rn
  FROM your_table
) 
WHERE mod(rn, 2) <> 0;


This query will remove all rows with odd row numbers from the specified table. Make sure to replace your_table with the actual name of the table from which you want to remove odd rows.


How to delete rows in a table that meet a certain criteria in Oracle?

To delete rows in a table that meet a certain criteria in Oracle, you can use the following SQL query:

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DELETE FROM table_name
WHERE condition;


Replace table_name with the name of your table and condition with the criteria you want to match. For example, if you want to delete all rows in a table where the value in column column_name is equal to value, you can use the following query:

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DELETE FROM table_name
WHERE column_name = value;


Make sure to carefully review the criteria before executing the DELETE statement, as this operation cannot be undone and will permanently remove the data from the table. It is also recommended to first create a backup of the table or the rows that you intend to delete.


How to identify odd rows in a table in Oracle?

You can use the following query to identify odd rows in a table in Oracle:

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SELECT *
FROM (
    SELECT 
        ROW_NUMBER() OVER (ORDER BY <column_name>) AS row_num,
        <column_name>
    FROM <table_name>
)
WHERE MOD(row_num, 2) <> 0;


Replace <column_name> with the column you want to use for ordering the rows and <table_name> with the name of the table you want to query.


The ROW_NUMBER() function assigns a unique number to each row based on the order specified in the ORDER BY clause. The MOD() function is then used to filter out the odd rows by checking if the row number is not divisible by 2.


What is the function to delete odd rows in Oracle?

To delete odd rows in Oracle, you can use the following SQL statement:

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DELETE FROM (SELECT *, ROW_NUMBER() OVER (ORDER BY <primary_key_column>) AS rn FROM <table_name>) 
WHERE MOD(rn, 2) <> 0;


Replace <primary_key_column> with the primary key column of your table and <table_name> with the name of your table. This query will delete all odd-numbered rows from the table.


How to delete rows that have been flagged for deletion in Oracle?

To delete rows that have been flagged for deletion in Oracle, you can use the following steps:

  1. Identify the column that contains the flag for deletion. Let's say the column name is 'deleted_flag'.
  2. Write a DELETE statement with a WHERE clause that filters out rows with the flag for deletion. For example: 
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DELETE FROM your_table
WHERE deleted_flag = 'Y';


  1. Execute the DELETE statement in your Oracle database to remove the flagged rows.
  2. Optionally, you may want to review the rows that will be deleted before executing the DELETE statement by running a SELECT statement with the same WHERE clause: 
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SELECT *
FROM your_table
WHERE deleted_flag = 'Y';


  1. After confirming that the correct rows will be deleted, you can proceed with executing the DELETE statement.


Please make sure to backup your data before performing any DELETE operation to avoid irreversible data loss.

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