13.59 SELECT INTO Statement
The SELECT
INTO
statement retrieves values from one or more database tables (as the SQL SELECT
statement does) and stores them in variables (which the SQL SELECT
statement does not do).
Caution:
The SELECT
INTO
statement with the BULK
COLLECT
clause is vulnerable to aliasing, which can cause unexpected results. For details, see "SELECT BULK COLLECT INTO Statements and Aliasing".
See Also:
Oracle Database SQL Language Reference for the syntax of the SQL SELECT
statement
Topics
Syntax
select_into_statement ::=
( bulk_collect_into_clause ::=, into_clause ::=, Oracle Database SQL Language Reference for select_list syntax)
Semantics
select_into_statement
DISTINCT | UNIQUE
Specify DISTINCT
or UNIQUE
if you want the database to return only one copy of each set of duplicate rows selected. These two keywords are synonymous. Duplicate rows are those with matching values for each expression in the select list.
Restrictions on DISTINCT and UNIQUE Queries
-
The total number of bytes in all select list expressions is limited to the size of a data block minus some overhead. This size is specified by the initialization parameter
DB_BLOCK_SIZE
. -
You cannot specify
DISTINCT
if the select_list contains LOB columns.
ALL
(Default) Causes the database to return all rows selected, including all copies of duplicates.
select_list
If the SELECT
INTO
statement returns no rows, PL/SQL raises the predefined exception NO_DATA_FOUND
. To guard against this exception, select the result of the aggregate function COUNT(*)
, which returns a single value even if no rows match the condition.
into_clause
With this clause, the SELECT
INTO
statement retrieves one or more columns from a single row and stores them in either one or more scalar variables or one record variable. For more information, see "into_clause ::=".
bulk_collect_into_clause
With this clause, the SELECT
INTO
statement retrieves an entire result set and stores it in one or more collection variables. For more information, see "bulk_collect_into_clause ::=".
rest_of_statement
Anything that can follow the keyword FROM
in a SQL SELECT
statement, described in Oracle Database SQL Language Reference.
Examples
-
Example 2-25, "Assigning Value to Variable with SELECT INTO Statement"
-
Example 5-50, "SELECT INTO Assigns Values to Record Variable"
-
Example 6-37, "ROLLBACK Statement"
-
Example 6-38, "SAVEPOINT and ROLLBACK Statements"
-
Example 6-43, "Declaring Autonomous Function in Package"
-
Example 7-20, "Validation Checks Guarding Against SQL Injection"
-
Example 12-16, "Bulk-Selecting Two Database Columns into Two Nested Tables"
-
Example 12-17, "Bulk-Selecting into Nested Table of Records"
-
Example 12-21, "Limiting Bulk Selection with ROWNUM, SAMPLE, and FETCH FIRST"
Related Topics
In this chapter:
In other chapters:
See Also:
Oracle Database SQL Language Reference for information about the SQL SELECT
statement