Postgresql delete multiple rows from multiple tables

Postgresql delete multiple rows from multiple tables

To delete multiple rows from multiple tables in PostgreSQL, you can use the DELETE statement with the USING clause for each table. The USING clause allows you to specify additional tables from which to delete rows based on a condition.

Here's an example of how you can delete rows from two tables:

DELETE FROM table1 USING table2 WHERE table1.column1 = table2.column1 AND table2.column2 = 'some_condition'; DELETE FROM table2 USING table1 WHERE table2.column1 = table1.column1 AND table1.column3 = 'another_condition';

In these examples:

  • Replace table1, table2 with your actual table names.
  • Adjust the column1, column2, column3 and conditions according to your specific use case.

These DELETE statements use the USING clause to define a condition involving columns from both tables. Only rows meeting the specified conditions in both tables will be deleted.

Make sure to take a backup or perform these operations carefully, especially if the data deletion is irreversible. Test the queries in a safe environment before applying them to your production database.

Examples

  1. "PostgreSQL delete rows from multiple tables with a common condition"

    • Delete rows from multiple tables where a common condition is met.
    DELETE FROM table1 USING table2 WHERE table1.common_column = table2.common_column AND table2.condition = 'your_condition';

  2. "PostgreSQL delete multiple rows from one table with specific values"

    • Delete multiple rows from a single table based on specific values.
    DELETE FROM your_table WHERE column IN ('value1', 'value2', 'value3');

  3. "PostgreSQL delete rows from multiple tables using JOIN"

    • Use JOIN to delete rows from multiple tables based on a common condition.
    DELETE FROM table1 USING table2 WHERE table1.common_column = table2.common_column AND table2.condition = 'your_condition';

  4. "PostgreSQL delete rows from multiple tables with a subquery"

    • Delete rows from multiple tables using a subquery as a condition.
    DELETE FROM table1 WHERE common_column IN (SELECT common_column FROM table2 WHERE condition = 'your_condition');

  5. "PostgreSQL delete rows from multiple tables with cascading foreign keys"

    • Delete rows from multiple tables with cascading foreign keys.
    DELETE FROM table1 WHERE condition = 'your_condition';

  6. "PostgreSQL delete multiple rows from multiple tables using EXISTS"

    • Delete rows from multiple tables using EXISTS with a correlated subquery.
    DELETE FROM table1 WHERE EXISTS (SELECT 1 FROM table2 WHERE table1.common_column = table2.common_column AND table2.condition = 'your_condition');

  7. "PostgreSQL delete rows from multiple tables with RETURNING clause"

    • Use the RETURNING clause to display the deleted rows.
    DELETE FROM table1 USING table2 WHERE table1.common_column = table2.common_column AND table2.condition = 'your_condition' RETURNING *;

  8. "PostgreSQL delete multiple rows from multiple tables with common IDs"

    • Delete rows from multiple tables based on common IDs.
    DELETE FROM table1 WHERE id IN (SELECT id FROM table2 WHERE condition = 'your_condition');

  9. "PostgreSQL delete rows from multiple tables with a complex condition"

    • Delete rows from multiple tables with a complex condition involving multiple columns.
    DELETE FROM table1 USING table2 WHERE table1.column1 = table2.column1 AND table1.column2 = 'value' AND table2.condition = 'your_condition';

  10. "PostgreSQL delete multiple rows from multiple tables with JOIN and aliases"

    • Use table aliases in a JOIN to delete rows from multiple tables.
    DELETE FROM t1 USING table1 AS t1 JOIN table2 AS t2 ON t1.common_column = t2.common_column WHERE t2.condition = 'your_condition';

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