Search results
This is effective to drop the entire database including the tables if you have 1) a 'CREATE USER' script handy with all the exact permissions to recreate the database; and 2) permission to run that script.
7 maj 2009 · Delete all the data from all tables in oracle. DECLARE str VARCHAR2(100); BEGIN FOR i IN (SELECT object_name FROM user_objects WHERE object_type='TABLE' ) LOOP str := 'Truncate table '|| i.object_name; EXECUTE IMMEDIATE str; DBMS_OUTPUT.PUT_LINE('table data deleted :' || i.object_name); END LOOP; END;
First, you specify the name of the table from which you want to delete data. Second, you specify which row should be deleted by using the condition in the WHERE clause. If you omit the WHERE clause, the Oracle DELETE statement removes all rows from the table.
Oracle introduced the TRUNCATE TABLE statement that allows you to delete all rows from a big table. The following illustrates the syntax of the Oracle TRUNCATE TABLE statement: TRUNCATE TABLE schema_name.table_name [ CASCADE ] [[ PRESERVE | PURGE ] MATERIALIZED VIEW LOG ]] [[ DROP | REUSE ]] STORAGE ] Code language: SQL (Structured Query ...
The Oracle DELETE statement is used to delete a single record or multiple records from a table in Oracle. Syntax. The syntax for the DELETE statement in Oracle/PLSQL is: DELETE FROM table. [WHERE conditions]; Parameters or Arguments. table. The table that you wish to delete records from. WHERE conditions. Optional.
The TRUNCATE TABLE statement is used to remove all records from a table in Oracle. It performs the same function as a DELETE statement without a WHERE clause. Warning: If you truncate a table, the TRUNCATE TABLE statement can not be rolled back. Syntax. The syntax for the TRUNCATE TABLE statement in Oracle/PLSQL is:
3). delete data from non cascaded tables as DELETE TABLE WHERE EXISTS (SELECT key FROM temp_table WHERE table.key = temp.key) and COMMIT; 4). delete parent tables which cascade to all child tables with same DELETE as above. and COMMIT after each statement.
