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
Effects of NULL for Multiple Assignments - SQL If the row expression given as the source for a multiple assignment evaluates to NULL, then NULL is assigned to each target. If

Use of Table Expressions - Expressing Constraint Conditions With the exception of key constraints, the examples in the theory book all explicitly reference at least one relvar

OPEN-FOR Statement The OPEN-FOR statements execute the multi-row query related with a cursor variable. It also allocates the resources used by the Oracle to process the query a

Updating Variables For assignment, SQL uses the key word SET, as in SET X = X + 1 (read as "set X equal to X+1") rather than X: = X + 1 as found in many computer languages.

We are seeking a freelance consultant that is familiar with Appgen applications. We require exporting all our data into a format appropriate for importing into SAP Business One. Pl

Cursor Attributes   The Cursors and cursor variables have 4 attributes which give you helpful information about the execution of a data manipulation statement. Syntax:

Declaring Cursor Variables Once a REF CURSOR type is define by you, and then you can declare the cursor variables of that type in any PL/SQL block or subprogram. In the exampl

PITS Depressions in secondary cell wall is called pit. A pit present on the free cell wall surface without its partner is called Blind pit. It consists of 2 parts -

Parameter and Keyword Description: procedure_name The user-defined procedure is declared by this construct. parameter_name: This identifies the formal parameter t

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