Values in the list by the order of table in SELECT Union

Version: 11.2

Apparently a very basic thing. But I couldn't do it :)

In the UNION example below automatic sorting in is based on alphabetical order. I want to get rid of this sort and list the values according to the order of the table in the SELECT.

Test data

create table test1 (name1 varchar2(10));

create table test2 (name2 varchar2(10));

create table test3 (name3 varchar2(10));


insert into test1 values ('EARTH');
insert into test1 values ('TAURUS');
insert into test2 values ('YELLOW');

insert into test2 values ('ALPHA');
insert into test2 values ('TANGO');


insert into test3 values ('BRAVO');


select name1 from test1
union
select name2 from test2
union
select name3 from test3;

NAME1
----------
ALPHA
BRAVO
EARTH
TANGO
TAURUS
YELLOW

6 rows selected.

In the above example, I want the values in the first array SELECT listed first, then all the values of the second table in SELECT it and so on.

Basically my requirement will be

Return all values from test1 (alphabetically sorted)
then
Return all values from test2 (alphabetically sorted)
then
Return all values from test3 (alphabetically sorted)

Expected results:

NAME1
----------
EARTH  ------------> from the first table in the SELECT
TAURUS ------------> from the first table in the SELECT
ALPHA  ----------------------> from the second table in the SELECT
TANGO  ----------------------> from the second table in the SELECT
YELLOW ----------------------> from the second table in the SELECT
BRAVO  ------------------------------> from the third table in the SELECT

Hello

Union made a distinct in terms of the line. From the line "ALPHA", 2 and the line 'ALPHA', 3 are different, they both show in the result set.

Further, you are all just lucky, that you get the results you want with the order clause:

order by 2

This performs a sort on the second column (1,2,3)
Also, you want to sort on the first column (name1, name2 and Name3). The order clause should be (as already shown correctly abbove):

order by
  2, 1

Kind regards

Peter

Tags: Database

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How to change the order for table?

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*
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2      
3     ---------------------------------------------------------------------------------------------------------
4     | Id  | Operation                     | Name                    | Rows  | Bytes | Cost (%CPU)| Time     |
5     ---------------------------------------------------------------------------------------------------------
6     |   0 | SELECT STATEMENT              |                         |  1806 |   199K|     9  (23)| 00:00:01 |
7     |*  1 |  HASH JOIN                    |                         |  1806 |   199K|     9  (23)| 00:00:01 |
8     |   2 |   MERGE JOIN                  |                         |   482 | 48682 |     6  (17)| 00:00:01 |
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10     |   4 |     INDEX FULL SCAN           | XAK1Guest_ADDRESS      |   919 |       |     1   (0)| 00:00:01 |
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13     |   7 |   VIEW                        | index$_join$_003        |  3493 | 41916 |     3   (0)| 00:00:01 |
14     |*  8 |    HASH JOIN                  |                         |       |       |            |          |
15     |   9 |     INDEX FAST FULL SCAN      | XAK1Guest_DOMAIN_Relation |  3493 | 41916 |     1   (0)| 00:00:01 |
16     |  10 |     INDEX FAST FULL SCAN      | XPKGuest_DOMAIN_Relation  |  3493 | 41916 |     1   (0)| 00:00:01 |
17     ---------------------------------------------------------------------------------------------------------
18      
19     Predicate Information (identified by operation id):
20     ---------------------------------------------------
21

Is there in any case, I have Guess_Domain_Relation table join firstly that the join to Guess_Address table of Guest_info?

I tried a few ways to rewrite the query, but he's no luck

Thank you

Published by: Y.L on March 20, 2013 13:59

Y.L wrote:
And my another problem here... I don't know why my first clue didn't work...

Probably the syntax. The main indicator uses parentheses, as

/*+
select /*+ leading(table1, table2) */ *
  from table1, table2
*/

Remember that you must use the table alias name in tips for the identifier to be recognized

You can also consider using the y indicator (if you must use a hint) for several tables - beware, it is MUCH easier to do worse performance with this suspicion using the order of the tables in the FROM clause in left to right

/*+
select /*+  ordered */ *
  from table1, table2, table3
. . .
*/

How I create index will affect how it works?

How the index was created probably won't affect how it works. Indexes can be created using constraints and directly with the CREATE INDEX command. The creation of the index should not be as important as its defined characteristics: index type, columns, etc.

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You forgot the / before the last InputParameters. If fix you that, your code will work.

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```
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```
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Values in the list by the order of table in SELECT Union

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