I have loop script by pl/sql, my script returned order by i asc,
DECLARE
i NUMBER;
BEGIN
FOR rec IN (
SELECT 1 as i from dual
UNION
SELECT 2 as i from dual
UNION
SELECT 3 as i from dual
UNION
SELECT 4 as i from dual
)
LOOP
DBMS_OUTPUT.PUT_LINE (rec.i);
END LOOP;
end;
and it returned
1
2
3
4
but I need ordering
1
4
3
2
what function should I use to solve the problem, thank you advence
I would expect this to return what you want:
DECLARE
i NUMBER;
BEGIN
FOR rec IN (
SELECT 1 as i from dual
UNION ALL
SELECT 4 as i from dual
UNION ALL
SELECT 3 as i from dual
UNION ALL
SELECT 2 as i from dual
) LOOP
DBMS_OUTPUT.PUT_LINE (rec.i);
END LOOP;
end;
However, that is just because the data is small. Oracle doesn't guarantee the ordering of result sets without an ORDER BY. So a safer method is:
DECLARE
i NUMBER;
BEGIN
FOR rec IN (
SELECT i
FROM (SELECT 1 as i, 1 as ord from dual UNION ALL
SELECT 4 as i, 2 from dual UNION ALL
SELECT 3 as i, 3 from dual UNION ALL
SELECT 2 as i, 4 from dual
) x
ORDER BY ord
) LOOP
DBMS_OUTPUT.PUT_LINE (rec.i);
END LOOP;
end;
As Main starting reference point of interest for indexing may be i-1 in the order by part of the sql statement.
So, the following cursor may be prefered :
SELECT * FROM
(
SELECT 1 as i from dual
UNION
SELECT 2 as i from dual
UNION
SELECT 3 as i from dual
UNION
SELECT 4 as i from dual
)
ORDER BY sign(i-1), (i-1) desc;
SQL Fiddle Demo
Instead of using UNION operator use UNION ALL operator because UNION operator return sorted distinct result. On the other hand UNION ALL operator return duplicate unsorted result
try the below query:-
SET SERVEROUTPUT ON;
DECLARE
i NUMBER;
BEGIN
FOR rec IN (
SELECT 1 as i from dual
UNION ALL
SELECT 4 as i from dual
UNION ALL
SELECT 3 as i from dual
UNION ALL
SELECT 2 as i from dual
) LOOP
DBMS_OUTPUT.PUT_LINE (rec.i);
END LOOP;
end;
/
Related
I don't know what is best solution for my problem. I need function with one parameter which resault is
VAL
-----
1
2
3
In function I need put union all to get all value.
Select column_1 as VAL from my_table where id = P_FUNCTION_PARAMETER --return 1
union all
Select column_2 as VAL from my_table where id = P_FUNCTION_PARAMETER --return 2
union all
Select column_3 as VAL from my_table where id = P_FUNCTION_PARAMETER; --return 3
What is the best solution for this?
"Best" just depends. Return a ref cursor or a collection, whichever you prefer.
For example:
SQL> create or replace function f_test_rc
2 return sys_refcursor
3 is
4 rc sys_refcursor;
5 begin
6 open rc for
7 select 1 from dual union all
8 select 2 from dual union all
9 select 3 from dual;
10
11 return rc;
12 end;
13 /
Function created.
SQL> select f_test_rc from dual;
F_TEST_RC
--------------------
CURSOR STATEMENT : 1
CURSOR STATEMENT : 1
1
----------
1
2
3
SQL> create or replace function f_test_coll
2 return sys.odcinumberlist
3 as
4 l_coll sys.odcinumberlist;
5 begin
6 select * bulk collect into l_coll
7 from (select 1 from dual union all
8 select 2 from dual union all
9 select 3 from dual
10 );
11
12 return l_coll;
13 end;
14 /
Function created.
SQL> select * from table(f_test_coll);
COLUMN_VALUE
------------
1
2
3
SQL>
First let's set up a small table for testing:
create table my_table
( id number primary key
, column_1 number
, column_2 number
, column_3 number
);
insert into my_table
select 1008, 3, -8, 0.2 from dual union all
select 1002, 6, null, -1.2 from dual
;
commit;
The function can look like this. Note that I don't use union all - that will require reading the table three times, when only one time is enough.
create or replace function my_function (p_function_parameter number)
return sys.odcinumberlist
as
arr sys.odcinumberlist;
begin
select case ord when 1 then column_1
when 2 then column_2
when 3 then column_3 end
bulk collect into arr
from my_table cross join
(select level as ord from dual connect by level <= 3)
where id = p_function_parameter
order by ord
;
return arr;
end;
/
The function could be used, for example, like this: (in older versions you may need to wrap the function call within the table operator)
select * from my_function(1002);
COLUMN_VALUE
------------
6
-1.2
sql query for like to show exact match first in list:
dataset: "abcd", "a","b","bc","bcd"
select * from table where data like "%bc%";
it should show in order bc, abcd, bcd.
As you said - sort by match.
SQL> with test (col) as
2 (select 'abcd' from dual union all
3 select 'a' from dual union all
4 select 'b' from dual union all
5 select 'bc' from dual union all
6 select 'bcd' from dual
7 )
8 select col
9 from test
10 where col like '%' || '&&par_search_string' ||'%'
11 order by utl_match.jaro_winkler_similarity(col, '&&par_search_string') desc;
Enter value for par_search_string: bc
COL
----
bc
bcd
abcd
SQL> undefine par_search_string
SQL> /
Enter value for par_search_string: cd
COL
----
bcd
abcd
SQL>
One of many methods:
with
t as (
select 'abcd' c from dual union all
select 'a' from dual union all
select 'b' from dual union all
select 'bc' from dual union all
select 'bcd' from dual
)
select *
from t
where c like '%bc%'
order by length(c)
Demo.
I think you can use a query like this one that can return your expected result.
select * from table where data='bc'
union all
select * from table where data like '%bc%' and data<>'bc'
One method is:
select *
from t
where data like '%bc%'
order by (case when data = 'bc' then 1 else 2 end);
Or if you don't want to type so much:
order by nullif(data, 'bc') desc
The descending sort puts NULL values first.
I want to fetch data from database using regular expression which should not include string '05613'.
I have values like NAW_05613_11_PL04_02 in my table. I want to give condition that all rows which have 05613 in it should not be displayed.
I have tried using REGEXP_LIKE(d.variable_value_string, '^N(*)[^{05613}](*)')
SELECT * from tablename where REGEXP_LIKE(columnname, '^N(*)[^{05613}](*)')
Expected result should be- row with value having 05613 should not be retrieved.
A simple LIKE could be enough:
... columnName not like '%05613%'
For example:
SQL> with test(c) as (
2 select '05613XX' from dual union all
3 select 'XX05613' from dual union all
4 select 'X05613X' from dual union all
5 select 'XXX' from dual
6 )
7 select *
8 from test
9 where c not like '%05613%';
C
-------
XXX
SQL>
If you need, for some reason, regexp_like, this is a way:
SQL> with test(c) as (
2 select '05613XX' from dual union all
3 select 'XX05613' from dual union all
4 select 'XX05613' from dual union all
5 select 'X05613X' from dual union all
6 select 'XXX' from dual
7 )
8 select *
9 from test
10 where not regexp_like(c, '05613');
C
-------
XXX
If this is your assignment and usage of regexp_like is mandated then use following regexp_like:
SELECT * from tablename D
where Not REGEXP_LIKE(d.variable_value_string, '05613')
Cheers!!
How can I retrieve values in a row as column values?
Example:
Consider the output of below query as INPUT :
Select 1,2,3,4,5,6,7,8,9,10
from dual;
I need a query that can give below output:
COL1
----
1
2
3
4
5
6
7
8
9
10
SELECT 1 AS "COL1" FROM dual
UNION
SELECT 2 FROM dual
UNION
SELECT 3 FROM dual
UNION
SELECT 4 FROM dual
UNION
SELECT 5 FROM dual
UNION
SELECT 6 FROM dual
UNION
SELECT 7 FROM dual
UNION
SELECT 8 FROM dual
UNION
SELECT 9 FROM dual
UNION
SELECT 10 FROM dual ;
If you want to generate a sequence of numbers in Oracle:
with n as (
select level as n
from dual
connect by level <= 10
)
select *
from n;
Or, if you have 10 columns, you can do an unpivot. An easy way is with union all:
select col1 from t union all
select col2 from t union al
. . .
select col10 from t;
I have a column in the database in the following format: yymmddhh24miss
Sample Data:
140203101241
140202101141
140102101240
143001101244
142801101245
142701131347
142601121542
142101131744
...
I need to get the nearest high value from the list. Ex: If I pass 142701131333, then it should return 142701131347 from the above list.
Any help appreciated!
SELECT data
FROM
(
SELECT data
FROM tbl
WHERE data > '142701131333'
ORDER BY data
) a
WHERE rownum = 1
SQL> with t (x) as (
2 select 140203101241 from dual union all
3 select 140202101141 from dual union all
4 select 140102101240 from dual union all
5 select 143001101244 from dual union all
6 select 142801101245 from dual union all
7 select 142701131347 from dual union all
8 select 142601121542 from dual union all
9 select 142101131744 from dual
10 )
11 select min(x) minx from t where x > 142701131333
12 /
MINX
-----------------
142701131347
SELECT MIN(sample_data)
FROM tableName
WHERE sample_data > 142701131333