Creating a view and replacing id with strings of text values

This can be a pretty basic question, but I'm a newbie so any advice is appreciated.

Here's my data:

create table user_attributes (id NUMBER, attr1 number, attr2 number, attr3 number, attr4 number, attr5 number);
create table tag_values (tag_id number, tag varchar2(30));


insert into user_attributes (id, attr1, attr2, attr3, attr4, attr5) values (1, 101, 105, 102, null, null);
insert into user_attributes (id, attr1, attr2, attr3, attr4, attr5) values (2, 105, null, 101, 105, null);
insert into user_attributes (id, attr1, attr2, attr3, attr4, attr5) values (3, 102, null, null, 105, 103);


insert into tag_values (tag_id, tag) values (101, 'blue');
insert into tag_values (tag_id, tag) values (102, 'red');
insert into tag_values (tag_id, tag) values (103, 'green');
insert into tag_values (tag_id, tag) values (104, 'orange');
insert into tag_values (tag_id, tag) values (105, 'black');

I want to create a view and the column id and the text of the tag instead of the ID.

That's what I use so far (just showing three columns of attribute for example):

SELECT a.id,
  b.tag ATTR1,
  c.tag ATTR2,
  d.tag ATTR3
FROM user_attributes a
LEFT JOIN tag_values b
ON a.attr1 = b.TAG_ID
LEFT JOIN tag_values c
ON a.attr2 = c.TAG_ID
LEFT JOIN tag_values d
ON a.attr3 = d.TAG_ID
ORDER BY 1;

Result:

  ID        ATTR1                          ATTR2                          ATTR3                        
---------- ------------------------------ ------------------------------ ------------------------------
         1 blue                           black                          red                            
         2 black                                                         blue                           
         3 red       

That's what I want, but I have a lot of data and I want to just make sure that I do things properly. Is there a more efficient way to build this application?

Hello

It would be so much easier if you had only 1 column to search, not 5.  We will therefore unpivot the table so there is only 1 column to search; then we can switch it to display as you wish:

WITH unpivoted_data AS

(

SELECT ua.id, ua.col, tv.tag

Of user_attributes

UNPIVOT (attr

FOR the collar (attr1, attr2, attr3, attr4, attr5)

)                ua

JOIN tag_values tv ON tv.tag_id = ua.attr

)

SELECT *.

Of unpivoted_data

PIVOT (MIN (tag)

At THE neck ('ATTR1' AS attr1

'ATTR2' attr2 VALUE

'ATTR3' attr3 AS

'ATTR4' AS attr4

'ATTR5' AS attr5

)

)

ORDER BY id

;

Output:

ID ATTR1 ATTR2, ATTR3 ATTR4 ATTR5

--- ----- ----- ----- ----- -----

1 red blue black

2 black blue black

3 black red green

.

It is better to have the attributes in a dynamic no cross-form for this problem, it is perhaps better to have the attributes of the dynamic non cross-shape for most other uses, too.  Consider to permanently store the attributes with only 1 attribute per line.

Tags: Database

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