Armi code cannot


Hi all

I was PL/SQL challenge question https://plsqlchallenge.oracle.com/pls/apex/f?p=10000:23:112798514303414:NO: but unable to understand a few line of code, I appreciate if someone help out me. Thank you

drop table plch_ingredients;
/
DROP TABLE plch_recipes;
/

create table plch_recipes)
primary key of the entire recipe_id
, recipe_name varchar2 (20) not null
)
/

create table plch_ingredients)
recipe_id integer not null
Reference plch_recipes (recipe_id)
, varchar2 (20) ingredient non-null
unique (recipe_id, ingredient)
)
/
insert into plch_recipes values (100, 'Cookies')
/
insert into plch_recipes values (200, "Brownies")
/
insert into plch_recipes values (300, "pancakes")
/

insert into plch_ingredients values (100, 'Chocolate')
/
insert into plch_ingredients values (100, 'eggs')
/
insert into plch_ingredients values (100, 'flour')
/
insert into plch_ingredients values (100, ' sugar')
/
insert into plch_ingredients values (100, 'butter')
/

insert into plch_ingredients values (200, "cocoa")
/
insert into plch_ingredients values (200, "flour")
/
insert into plch_ingredients values (200, ' sugar')
/
insert into plch_ingredients values (200, "butter")
/

insert into plch_ingredients values (300, "flour")
/
insert into plch_ingredients values (300, 'eggs')
/
insert into plch_ingredients values (300, 'milk')
/

Commit
/
CREATE TYPE plch_ingredients_type AS TABLE OF VARCHAR2 (20)
/
Select recipe.recipe_name
, cast ( )
MULTISET
(
Select ingredient.ingredient
the ingredient plch_ingredients
where ingredient.recipe_id = recipe.recipe_id
order of ingredient.ingredient
) as plch_ingredients_type
) of the ingredients
plch_recipes recipe
ORDER BY recipe.recipe_name
;

The query result

RECIPE_NAME, INGREDIENTS

"Brownie" JEN. PLCH_INGREDIENTS_TYPE ('Butter', 'Cocoa', 'Flour', 'Sugar')

JEN cookies. PLCH_INGREDIENTS_TYPE ('Butter', 'Chocolate', 'Eggs', 'Flour', 'Sugar')

JEN pancakes. PLCH_INGREDIENTS_TYPE ('Eggs', 'Flour', 'Milk')

I don't know what the real purpose of melting and multiset in above query and really grateful if someone guide me. Thank you

Concerning

Matt

A multiset is a kind of game, but allows an element to appear more than once.

Value = {a, b}

Multiset = {a, a, a, b, b}

Your query in question receives a set of values of the query lines and put them in a single type which is being able to represent a multiset.  The command of type MULTISET did this...

one

b

c-online {a, b, c, d, d, e}

d

d

e

Where {a, b, c, d, d, e} are the elements of the plch_ingredients_type.  The CASTING shows just the parser what type the multiset operator is making it in.

Tags: Database

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