Difference between revisions of "SQL DELETE"
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==See Also== | ==See Also== | ||
| − | [[EXECUTE IMMEDIATE]], [[SQL INSERT|INSERT]], [[GETENV()]], [[SET TCACHE]] | + | [[ADD TABLE]], [[CREATE DATABASE]], [[DB_DATADIR]], [[EXECUTE IMMEDIATE]], [[SQL INSERT|INSERT]], [[GETENV()]], [[OPEN DATABASE]], [[SET AUTOCATALOG]], [[SET TCACHE]], [[SQL USE|USE]] |
Revision as of 16:30, 19 March 2009
Contents
DELETE
Class
SQL Applications
Purpose
Deletes one or more rows from a table
Syntax
DELETE FROM [<database>!]<table>
[WHERE CURRENT OF <cursor> | [CURRENT OF] <condition>]
See Also
ADD TABLE, CREATE DATABASE, DB_DATADIR, EXECUTE IMMEDIATE, INSERT, GETENV(), OPEN DATABASE, SET AUTOCATALOG, SET TCACHE, USE
Description
The DELETE command executes an immediate physical deletion of the specified records i.e., records are permanently removed from the table, and cannot be recalled.
To perform a DELETE operation you must have the DELETE privilege or be the owner of the table.
| Keywords | Description |
|---|---|
| database | The name of the database to which the table belongs. Databases in Recital are implemented as directories containing files that correspond to the tables and associated files in the database. Operating System file protection can be applied individually to the files for added security. The directory is a sub-directory of the Recital data directory. The environment variable / symbol DB_DATADIR points to the current Recital data directory and can be queried using the GETENV() function. Files from other directories can be added to the database using the ADD TABLE command or via the database catalog and SET AUTOCATALOG functionality. The '!' character must be included between the database name and the table name. |
| table | The name of the table from which to delete the rows. |
| WHERE | Specifies which rows are to be deleted. |
| CURRENT OF cursor | Deletes only the row most recently fetched by the cursor. |
| condition | Deletes only the rows that satisfy the condition. |
Example
DELETE FROM staff WHERE ord_date < date();
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
