This document covers the following topics:
Belongs to Function Group: Database Access and Update
The SQL DELETE statement is used to delete either rows in a
table without using a cursor ("searched"
DELETE) or rows in a table to which a cursor is
positioned ("positioned"
DELETE).
Two different structures are possible.
The "searched" DELETE statement is a
stand-alone statement not related to any SELECT statement. With a single
statement you can delete zero, one, multiple or all rows of a table. The rows
to be deleted are determined by a search-condition
that is applied to the table. Optionally, the table name can be assigned a
correlation-name.
Note:
The number of rows that have actually been deleted with a
"searched" DELETE can be ascertained by using the
system variable *ROWCOUNT;
see System Variables documentation.
Common Set Syntax:
DELETE
FROM
table-name
[(correlation-name
)] [WHERE
search-condition]
|
Extended Set Syntax:
DELETE FROM table-name [(correlation-name
)]
|
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WITH
|
|
|
|
|
[QUERYNO
integer]
|
|
[WHERE
search-condition]
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For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.
Syntax Element Description:
| Syntax Element | Description | |
|---|---|---|
FROM
table-name
|
FROM Clause:
This clause specifies the table from which the rows are to be deleted. |
|
correlation-name
|
Correlation Name: Optionally, the
table name can be assigned a correlation-name.
|
|
WHERE
search-condition
|
WHERE Clause:
This clause is used to specify the selection criteria for the rows to be deleted. If no |
|
WITH
|
WITH Isolation Level Clause:
This clause belongs to the SQL Extended Set. This clause enables the explicit specification of the isolation level used when locating the row to be deleted. It is only valid against DB2 databases. When used against other databases, it will cause runtime errors. |
|
CS |
Cursor Stability | |
RR |
Repeatable Read | |
RS |
Read Stability | |
QUERYNO
integer
|
QUERYNO Clause:
This clause belongs to the SQL Extended Set. This clause is not currently supported and will be ignored. |
|
The "positioned" DELETE statement always
refers to a cursor within a database loop. Therefore the table referenced by a
positioned DELETE statement must be the same as the one referenced
by the corresponding SELECT statement, otherwise an
error message is returned. A positioned DELETE cannot be used with
a non-cursor selection.
The functionality of the positioned DELETE statement
corresponds to that of the "normal"
Natural DELETE statement.
DELETE FROM
table-name WHERE CURRENT OF
CURSOR [(r)]
|
For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.
Syntax Element Description:
| Syntax Element | Description |
|---|---|
FROM
table-name WHERE CURRENT OF
CURSOR |
FROM Clause:
This clause specifies the table from which the rows are to be deleted. |
(r) |
Statement Reference:
The |
FOR ROW ... OF
ROWSET
|
FOR ROW … OF ROWSET Clause:
This clause belongs to the SQL Extended Set. The optional |
