Select at least 1 rank, even if the table is empty

Hi all

I've got table t1:

with t1 as (
select 1 as column1, 't' as column2 from dual
)
select * from t1

My need is to select at least 1 rank, even if the table is empty, for example:

with t1 as (
select 1 as column1, 't' as column2 from dual
)
select * from t1 where rownum = 0
union all 
select 0 as column1, '' as column2 from dual

The problem is that I don't know the amount of columns and its data type. How can I make a dynamic query based on the current structure of table t1?

Hello

This looks like a job for an outer join:

SELECT  t1.*
FROM            dual
LEFT OUTER JOIN t1    ON  1 = 1
;

Because it is not reference individual columns from t1, you do not need to know what are the columns it, or what their data types.

Tags: Database

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Let's say you have a table like
(t)
int ID1,
ID2 int,
varchar (4000) textColumn1,.
varchar (4000) textColumn2,.
varchar (4000) textColumn3
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It works for me in 12.1.0.2 if I do the column you want to select NOT NULL. This makes sense because otherwise the rowid would not appear in the index (although I don't see why that just cannot be interpreted as NULL). This also works if you filter nulls.

SQL > create table t_1 (id1 number, id2 number, colonne_1 varchar2 (4000));

Table created.

SQL > create index t_1_idx_01 on t_1 (id1);

The index is created.

SQL > create index t_1_idx_02 on t_1 (id2);

The index is created.

SQL > explain the plan for
2 Select / * + INDEX_JOIN (t t_1_idx_01) INDEX_JOIN (t_1_idx_02 t) * / id2 t_1 t where id1 =: X;

He explained.

SQL > @x

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------
Hash value of plan: 4181077581

--------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
--------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT |            |    1.    26.    1 (0) | 00:00:01 |
| 1. TABLE ACCESS BY ROWID INDEX BATCH | T_1        |    1.    26.    1 (0) | 00:00:01 |
|* 2 | INDEX RANGE SCAN | T_1_IDX_01 |    1.      |    1 (0) | 00:00:01 |
--------------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):
---------------------------------------------------

2 - access ('ID1' = TO_NUMBER (:X))

Note
-----
-the dynamic statistics used: dynamic sampling (level = 2)

18 selected lines.

SQL > alter table t_1 change id2 not null;

Modified table.

SQL > explain the plan for
2 Select / * + INDEX_JOIN (t t_1_idx_01) INDEX_JOIN (t_1_idx_02 t) * / id2 t_1 t where id1 =: X;

He explained.

SQL > @x

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------
Hash value of plan: 1085250311

-------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT |                  |    1.    26.    2 (0) | 00:00:01 |
|* 1 | VIEW                  | the index $ _join$ _001.    1.    26.    2 (0) | 00:00:01 |
|* 2 | HASH JOIN |                  |      |      |            |          |
|* 3 |    INDEX RANGE SCAN | T_1_IDX_01 |    1.    26.    1 (0) | 00:00:01 |
| 4.    FULL RESTRICTED INDEX SCAN FAST | T_1_IDX_02 |    1.    26.    1 (0) | 00:00:01 |
-------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):
---------------------------------------------------

1 Filter ('ID1' = TO_NUMBER (:X))
2 - access (ROWID = ROWID)
3 - access ('ID1' = TO_NUMBER (:X))

Note
-----
-the dynamic statistics used: dynamic sampling (level = 2)

22 selected lines.

SQL > alter table t_1 change id2 null;

Modified table.

SQL > explain the plan for
2 Select / * + INDEX_JOIN (t t_1_idx_01) INDEX_JOIN (t_1_idx_02 t) * / id2 t_1 t where id1 =: X and id2 is not null;

He explained.

SQL > @x

PLAN_TABLE_OUTPUT
-----------------------------------------------------------------------------------------------------------------------------------
Hash value of plan: 1085250311

-------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT |                  |     1.    26.     2 (0) | 00:00:01 |
|* 1 | VIEW                  | the index $ _join$ _001.     1.    26.     2 (0) | 00:00:01 |
|* 2 |   HASH JOIN |                  |       |       |            |          |
|* 3 |    INDEX RANGE SCAN | T_1_IDX_01 |     1.    26.     1 (0) | 00:00:01 |
|* 4 |    FULL RESTRICTED INDEX SCAN FAST | T_1_IDX_02 |     1.    26.     1 (0) | 00:00:01 |
-------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):
---------------------------------------------------

1 Filter ('ID1' = TO_NUMBER (:X))
2 - access (ROWID = ROWID)
3 - access ('ID1' = TO_NUMBER (:X))
4 - filter ("ID2" IS NOT NULL)

Note
-----
-the dynamic statistics used: dynamic sampling (level = 2)

23 selected lines.

Your columns of text are very large, what is your block size? Under the value by default 8 k blocks, if your lines are completely filled while they are chained, and readings by rowid will be additional i/o. Consider measures to avoid migration of line and row chaining. In my view, this could be the reason for your index access is so slow.

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