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22 gru 2014 · If you want to use only one SQL query to delete all tables you can use this: EXEC sp_MSforeachtable @command1 = "DROP TABLE ?" This is a hidden Stored Procedure in sql server, and will be executed for each table in the database you're connected. Note: You may need to execute the query a few times to delete all tables due to dependencies.
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.
To move a table to the recycle bin or remove it entirely from the database, you use the DROP TABLE statement: DROP TABLE schema_name.table_name. [CASCADE CONSTRAINTS | PURGE]; Code language: SQL (Structured Query Language) (sql) In this statement: First, indicate the table and its schema that you want to drop after the DROP TABLE clause.
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.
When you want to delete all data from a table, you use the DELETE statement without the WHERE clause as follows: DELETE FROM table_name; Code language: SQL (Structured Query Language) (sql) For a table with a small number of rows, the DELETE statement does a good job.
Purpose. Use the DELETE statement to remove rows from: An unpartitioned or partitioned table. The unpartitioned or partitioned base table of a view. The unpartitioned or partitioned container table of a writable materialized view. The unpartitioned or partitioned master table of an updatable materialized view. Prerequisites.
Depending on the number of rows in your tables, it may be better for you to insert the records you dont want to delete into a temp table, truncate the main table and move the records back to the main. This would probably generate less redo than delete, but that depends on number of rows.
