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TYPE type_name IS TABLE OF element_type[NOT NULL];
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DECLARE
-- Define a nested table of variable length strings.
TYPE card_table IS TABLE OF VARCHAR2(5 CHAR);
-- Declare and initialize a nested table with three rows.
cards CARD_TABLE := card_table(NULL,NULL,NULL);
BEGIN
-- Print title.
dbms_output.put_line(
'Nested table initialized as nulls.');
dbms_output.put_line(
'----------------------------------');
-- Loop through the three records.
FOR i IN 1..3 LOOP
-- Print the contents.
dbms_output.put ('Cards Varray ['||i||'] ');
dbms_output.put_line('['||cards(i)||']');
END LOOP;
-- Assign values to subscripted members of the varray.
cards(1) := 'Ace';
cards(2) := 'Two';
cards(3) := 'Three';
-- Print title.
dbms_output.put (CHR(10)); -- Visual line break.
dbms_output.put_line(
'Nested table initialized as Ace, Two and Three.');
dbms_output.put_line(
'-----------------------------------------------');
-- Loop through the three records to print the varray contents.
FOR i IN 1..3 LOOP
dbms_output.put_line('Cards ['||i||'] '
|| '['||cards(i)||']');
END LOOP;
END;
/
2¡¢½«Ç¶Ì×±íÀàÐͶ¨ÒåºÍÓÃ×÷PL/SQLµÄ¶ÔÏóÀàÐÍ
CREATE OR REPLACE TYPE type_name
AS TABLE OF element_type [NOT NULL];
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-- Define a varray of four rows of variable length strings.
CREATE OR REPLACE TYPE card_unit_varray
AS VARRAY(13) OF VARCHAR2(5 CHAR);
/
-- Define a varray of four rows of variable length strings.
CREATE OR REPLACE TYPE card_suit_varray
AS VARRAY(4) OF VARCHAR2(8 CHAR);
/
-- Define a table of variable length strings.
CREATE OR REPLACE TYPE card_deck_table
AS TABLE OF VARCHAR2(17 CHAR);
/
DECLARE
-- Define a counter to manage 1 to 52 cards in a deck.
counter INTEGER
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create table users(
id number(4) primary key,
username varchar2(10),
password varchar2(10)
)
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select * from users for update
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alter table mobilephone drop column mobiletype
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