Keyword and parameter description - delete statement, PL-SQL Programming

Keyword and Parameter Description:

table_reference:

This specifies a table or view that should be accessible when you execute the DELETE statement, and for that you must have DELETE privileges.

Subquery:

This is a SELECT statement which provides a set of rows for the processing. Its syntax is such that of select_into_statement without the INTO clause.

TABLE (subquery2):

The operand of the TABLE is a SELECT statement which returns a single column value, that should be a nested table or a varray cast as a nested table. The Operator TABLE informs the Oracle that the value is a collection, but not a scalar value.

Alias:

This is another (generally short) name for the referenced table or view and is usually used in the WHERE clause.

WHERE search_condition:

This clause provisionally chooses the rows to be deleted from the referenced table or the view. Only rows which meet the search condition are deleted. If you omit the WHERE clause, then all rows in the table or view are deleted.

WHERE CURRENT OF cursor_name:

This clause refers to the most recent row processed by the FETCH statement related with the cursor identified by the cursor_name. The cursor should be FOR UPDATE and should be open and placed on a row. When the cursor is not open, the CURRENT OF clause causes an error.

When the cursor is open, but no rows have been fetched or the last fetch returned no rows, then PL/SQL raises the predefined exception NO_DATA_FOUND.

returning_clause:

This clause returns values from the deleted rows, by this means eliminating the need to SELECT the rows ahead of time. You can retrieve the column values into the variables and/or host variables, or into the collections and/or host arrays. Though, you cannot use the RETURNING clause for remote or parallel deletes.

BULK COLLECT:

These clauses instruct the SQL engine to bulk-bind the output collections before returning them to the PL/SQL engine. The SQL engine bulk-binds all the collections referenced in the RETURNING INTO list. The corresponding columns should store scalar (and not the composite) values. 

Posted Date: 10/8/2012 6:01:57 AM | Location : United States







Related Discussions:- Keyword and parameter description - delete statement, Assignment Help, Ask Question on Keyword and parameter description - delete statement, Get Answer, Expert's Help, Keyword and parameter description - delete statement Discussions

Write discussion on Keyword and parameter description - delete statement
Your posts are moderated
Related Questions
Aggregate Operators SQL Supports all of the aggregate operators mentioned in the theory book and many more besides. The syntax, however, involves an unusual trick that SQL cal

Updating a Variable Assignment of an attribute value in a variable of a structured type Synatx: SET SN.C = 'S2'; As in Example the entire statement is equivalent to a

Keyword and Parameter Description select_statement: This is a query which returns a result set of the rows. Its syntax is such that of select_ into_statement without the IN

Parameter and Keyword Description:   table_reference: This identifies a table or view which should be available when you execute the INSERT statement, and for that you sho

Product-specific Packages The Oracle and different Oracle tools are supplied with the product-specific packages which help you to build the PL/SQL-based applications. For illus

When Are Constraints Checked Under the model constraints are conceptually checked at all statement boundaries (and only at statement boundaries). By default the same is true

LIKE Operator You use the LIKE operator to compare the character value to a pattern. The Case is significant. LIKE returns the Boolean value TRUE when the character patterns mat

Joining in SQL Joining IS_CALLED and IS_ENROLLED_ON in SQL SELECT * FROM IS_CALLED NATURAL JOIN IS_ENROLLED_ON This is an example of an SQL table expression. I have been

Problem: (a) Define the following terms: (i) data mining. (ii) OLAP. (b) Differentiate between snowflake schema and star schema. Support your answer with appropriate

Wrapping and unwrapping in SQL Operators WRAP and UNWRAP in connection with attributes whose declared types are tuple types. Example shows how extension and projection can be