Would you know If i can select only whole numbers?
I don't want to round off the values.
For example this is select * from Table_1 below
Numbers
Team
10.5
A
12.12
B
23
C
I would do like
select * from Table_1
where NUMBERS is ;
Expected output below
Numbers
Team
23
C
Thank you very much!
The function TRUNC() truncates a number without rounding:
SELECT *
FROM Table_1
WHERE TRUNC("Numbers") = "Numbers";
See the demo.
You can use the ROUND function to filter (rather than to display) the values:
SELECT *
FROM table_1
WHERE ROUND(numbers) = numbers;
You could also use the FLOOR, CEIL or TRUNC functions instead of ROUND.
Or, you could use the MOD function:
SELECT *
FROM table_1
WHERE MOD(numbers, 1) = 0;
(And you could apply a function-based index to MOD(number, 1) if you wanted to improve performance.)
Which, for the sample data:
CREATE TABLE table_1 (Numbers, Team) AS
SELECT 10.5, 'A' FROM DUAL UNION ALL
SELECT 12.12, 'B' FROM DUAL UNION ALL
SELECT 23, 'C' FROM DUAL;
All the options output:
NUMBERS
TEAM
23
C
db<>fiddle here
Related
This is the code I have to create a string of DNA:
prepare dna_length(int) as
with t1 as (
select chr(65) as s
union select chr(67)
union select chr(71)
union select chr(84) )
, t2 as ( select s, row_number() over() as rn from t1)
, t3 as ( select generate_series(1,$1) as i, round(random() * 4 + 0.5) as rn )
, t4 as ( select t2.s from t2 join t3 on (t2.rn=t3.rn))
select array_to_string(array(select s from t4),'') as dna;
execute dna_length(20);
I am trying to figure out how to re-write this to give a table of 5 rows of strings of DNA of length 20 each, instead of just one row. This is for PostgreSQL.
I tried:
CREATE TABLE dna_table(g int, dna text);
INSERT INTO dna_table (1, execute dna_length(20));
But this does not seem to work. I am an absolute beginner. How to do this properly?
PREPARE creates a prepared statement that can be used "as is". If your prepared statement returns one string then you can only get one string. You can't use it in other operations like insert, e.g.
In your case you may create a function:
create or replace function dna_length(int) returns text as
$$
with t1 as (
select chr(65) as s
union
select chr(67)
union
select chr(71)
union
select chr(84))
, t2 as (select s,
row_number() over () as rn
from t1)
, t3 as (select generate_series(1, $1) as i,
round(random() * 4 + 0.5) as rn)
, t4 as (select t2.s
from t2
join t3 on (t2.rn = t3.rn))
select array_to_string(array(select s from t4), '') as dna
$$ language sql;
And use it in a way like this:
insert into dna_table(g, dna) select generate_series(1,5), dna_length(20)
From the official doc:
PREPARE creates a prepared statement. A prepared statement is a server-side object that can be used to optimize performance. When the PREPARE statement is executed, the specified statement is parsed, analyzed, and rewritten. When an EXECUTE command is subsequently issued, the prepared statement is planned and executed. This division of labor avoids repetitive parse analysis work, while allowing the execution plan to depend on the specific parameter values supplied.
About functions.
This can be much simpler and faster:
SELECT string_agg(CASE ceil(random() * 4)
WHEN 1 THEN 'A'
WHEN 2 THEN 'C'
WHEN 3 THEN 'T'
WHEN 4 THEN 'G'
END, '') AS dna
FROM generate_series(1,100) g -- 100 = 5 rows * 20 nucleotides
GROUP BY g%5;
random() produces random value in the range 0.0 <= x < 1.0. Multiply by 4 and take the mathematical ceiling with ceil() (cheaper than round()), and you get a random distribution of the numbers 1-4. Convert to ACTG, and aggregate with GROUP BY g%5 - % being the modulo operator.
About string_agg():
Concatenate multiple result rows of one column into one, group by another column
As prepared statement, taking
$1 ... the number of rows
$2 ... the number of nucleotides per row
PREPARE dna_length(int, int) AS
SELECT string_agg(CASE ceil(random() * 4)
WHEN 1 THEN 'A'
WHEN 2 THEN 'C'
WHEN 3 THEN 'T'
WHEN 4 THEN 'G'
END, '') AS dna
FROM generate_series(1, $1 * $2) g
GROUP BY g%$1;
Call:
EXECUTE dna_length(5,20);
Result:
| dna |
| :------------------- |
| ATCTTCGACACGTCGGTACC |
| GTGGCTGCAGATGAACAGAG |
| ACAGCTTAAAACACTAAGCA |
| TCCGGACCTCTCGACCTTGA |
| CGTGCGGAGTACCCTAATTA |
db<>fiddle here
If you need it a lot, consider a function instead. See:
What is the difference between a prepared statement and a SQL or PL/pgSQL function, in terms of their purposes?
Is there anybody who can help me converting base32 values to decimal numbers?
I have a sql statement which returns me a list of base32 values. For example the return of the select looks like this:
5
8
H
13r
Now I need to figure out which of these values is the highest (in this case 13r). Therefore I would need a function to convert these base32 values to decimal numbers in order to sort them.
Does anybody have such a function or does anybody have a different approach?
It will be little bit tricky.
You can create a function which will separate each character/digit from the original base32 number and multiply it with 32^(position in base32 number) to get decimal equivalent number and use that function in your query.
create function convert32todecimal(p_num in varchar2)
return number
as
lv_outnum number;
begin
select sum(val) into lv_outnum from
(
select power(32,pos) * case when d between '0' and '9'
then to_number(d)
else 10 + ascii(d) - ascii('A')
end as val
from (
select upper(substr(p_num,length(p_num)+1-level,1)) d,
level - 1 as pos
from dual
connect by level <= length(p_num)
)
);
return lv_outnum;
end;
/
Now, use this function in your query as following:
with your_data(num) as (
select '5' from dual union all
select '8' from dual union all
select 'H' from dual union all
select '13r' from dual
)
select num, convert32todecimal(num)
from your_data
order by 2 desc;
db<>fiddle demo
Cheers!!
I have one of the column in oracle table which has below value :
select csv_val from my_table where date='09-OCT-18';
output
==================
50,100,25,5000,1000
I want this values to be in ascending order with select query, output would looks like :
output
==================
25,50,100,1000,5000
I tried this link, but looks like it has some restriction on number of digits.
Here, I made you a modified version of the answer you linked to that can handle an arbitrary (hardcoded) number of commas. It's pretty heavy on CTEs. As with most LISTAGG answers, it'll have a 4000-char limit. I also changed your regexp to be able to handle null list entries, based on this answer.
WITH
T (N) AS --TEST DATA
(SELECT '50,100,25,5000,1000' FROM DUAL
UNION
SELECT '25464,89453,15686' FROM DUAL
UNION
SELECT '21561,68547,51612' FROM DUAL
),
nums (x) as -- arbitrary limit of 20, can be changed
(select level from dual connect by level <= 20),
splitstr (N, x, substring) as
(select N, x, regexp_substr(N, '(.*?)(,|$)', 1, x, NULL, 1)
from T
inner join nums on x <= 1 + regexp_count(N, ',')
order by N, x)
select N, listagg(substring, ',') within group (order by to_number(substring)) as sorted_N
from splitstr
group by N
;
Probably it can be improved, but eh...
Based on sample data you posted, relatively simple query would work (you need lines 3 - 7). If data doesn't really look like that, query might need adjustment.
SQL> with my_table (csv_val) as
2 (select '50,100,25,5000,1000' from dual)
3 select listagg(token, ',') within group (order by to_number(token)) result
4 from (select regexp_substr(csv_val, '[^,]+', 1, level) token
5 from my_table
6 connect by level <= regexp_count(csv_val, ',') + 1
7 );
RESULT
-------------------------
25,50,100,1000,5000
SQL>
I am looking for something similar to the bash for loop in oracle
for i in 1 5 3 8; do echo "print $i"; done
so this would result as
print 1
print 5
print 3
print 8
I want something similar logic in Oracle SQL like
for i in 1 5 3 8; do echo " select * from TABLE where column1='$i';"; done
so this would result as
select * from TABLE where column1='1';
select * from TABLE where column1='5';
select * from TABLE where column1='3';
select * from TABLE where column1='8';
So how do I get something similar logic in Oracle SQL
I hope that I understood your request correctly:
SELECT r FROM (
SELECT ROWNUM r
FROM DUAL
CONNECT BY ROWNUM <= 8)
WHERE r IN (1, 5, 3, 8)
Basically, we're creating a column of all numbers from 1 through 8 and then selecting the ones you requested. If you're going to work with strings or with a large range of numbers (but a small amount of rows), this solution won't be very efficient, and then you should store your values in a table.
You can build a loop in plsql, for example:
begin
for i in (
select 1 as num from dual union all
select 5 from dual union all
select 3 from dual union all
select 8 from dual
)
loop
dbms_output.put_line('number: ' || i.num);
/* do whatever you need */
end loop;
end;
/
If you need this to run a query, maybe you can simply use the IN:
select *
from table
where column1 in (1, 5, 3, 8)
or, to build a more complex list:
select *
from table
where column1 in (
select something
from ...
)
Using the DUAL table, how can I get a list of numbers from 1 to 100?
Your question is difficult to understand, but if you want to select the numbers from 1 to 100, then this should do the trick:
Select Rownum r
From dual
Connect By Rownum <= 100
Another interesting solution in ORACLE PL/SQL:
SELECT LEVEL n
FROM DUAL
CONNECT BY LEVEL <= 100;
Using Oracle's sub query factory clause: "WITH", you can select numbers from 1 to 100:
WITH t(n) AS (
SELECT 1 from dual
UNION ALL
SELECT n+1 FROM t WHERE n < 100
)
SELECT * FROM t;
Do it the hard way. Use the awesome MODEL clause:
SELECT V
FROM DUAL
MODEL DIMENSION BY (0 R)
MEASURES (0 V)
RULES ITERATE (100) (
V[ITERATION_NUMBER] = ITERATION_NUMBER + 1
)
ORDER BY 1
Proof: http://sqlfiddle.com/#!4/d41d8/20837
You could use XMLTABLE:
SELECT rownum
FROM XMLTABLE('1 to 100');
-- alternatively(useful for generating range i.e. 10-20)
SELECT (COLUMN_VALUE).GETNUMBERVAL() AS NUM
FROM XMLTABLE('1 to 100');
DBFiddle Demo
If you want your integers to be bound between two integers (i.e. start with something other than 1), you can use something like this:
with bnd as (select 4 lo, 9 hi from dual)
select (select lo from bnd) - 1 + level r
from dual
connect by level <= (select hi-lo from bnd);
It gives:
4
5
6
7
8
Peter's answer is my favourite, too.
If you are looking for more details there is a quite good overview, IMO, here.
Especially interesting is to read the benchmarks.
Using GROUP BY CUBE:
SELECT ROWNUM
FROM (SELECT 1 AS c FROM dual GROUP BY CUBE(1,1,1,1,1,1,1) ) sub
WHERE ROWNUM <=100;
Rextester Demo
A variant of Peter's example, that demonstrates a way this could be used to generate all numbers between 0 and 99.
with digits as (
select mod(rownum,10) as num
from dual
connect by rownum <= 10
)
select a.num*10+b.num as num
from digits a
,digits b
order by num
;
Something like this becomes useful when you are doing batch identifier assignment, and looking for the items that have not yet been assigned.
For example, if you are selling bingo tickets, you may want to assign batches of 100 floor staff (guess how i used to fund raise for sports). As they sell a batch, they are given the next batch in sequence. However, people purchasing the tickets can select to purchase any tickets from the batch. The question may be asked, "what tickets have been sold".
In this case, we only have a partial, random, list of tickets that were returned within the given batch, and require a complete list of all possibilities to determine which we don't have.
with range as (
select mod(rownum,100) as num
from dual
connect by rownum <= 100
),
AllPossible as (
select a.num*100+b.num as TicketNum
from batches a
,range b
order by num
)
select TicketNum as TicketsSold
from AllPossible
where AllPossible.Ticket not in (select TicketNum from TicketsReturned)
;
Excuse the use of key words, I changed some variable names from a real world example.
... To demonstrate why something like this would be useful
I created an Oracle function that returns a table of numbers
CREATE OR REPLACE FUNCTION [schema].FN_TABLE_NUMBERS(
NUMINI INTEGER,
NUMFIN INTEGER,
EXPONENCIAL INTEGER DEFAULT 0
) RETURN TBL_NUMBERS
IS
NUMEROS TBL_NUMBERS;
INDICE NUMBER;
BEGIN
NUMEROS := TBL_NUMBERS();
FOR I IN (
WITH TABLA AS (SELECT NUMINI, NUMFIN FROM DUAL)
SELECT NUMINI NUM FROM TABLA UNION ALL
SELECT
(SELECT NUMINI FROM TABLA) + (LEVEL*TO_NUMBER('1E'||TO_CHAR(EXPONENCIAL))) NUM
FROM DUAL
CONNECT BY
(LEVEL*TO_NUMBER('1E'||TO_CHAR(EXPONENCIAL))) <= (SELECT NUMFIN-NUMINI FROM TABLA)
) LOOP
NUMEROS.EXTEND;
INDICE := NUMEROS.COUNT;
NUMEROS(INDICE):= i.NUM;
END LOOP;
RETURN NUMEROS;
EXCEPTION
WHEN NO_DATA_FOUND THEN
RETURN NUMEROS;
WHEN OTHERS THEN
RETURN NUMEROS;
END;
/
Is necessary create a new data type:
CREATE OR REPLACE TYPE [schema]."TBL_NUMBERS" IS TABLE OF NUMBER;
/
Usage:
SELECT COLUMN_VALUE NUM FROM TABLE([schema].FN_TABLE_NUMBERS(1,10))--integers difference: 1;2;.......;10
And if you need decimals between numbers by exponencial notation:
SELECT COLUMN_VALUE NUM FROM TABLE([schema].FN_TABLE_NUMBERS(1,10,-1));--with 0.1 difference: 1;1.1;1.2;.......;10
SELECT COLUMN_VALUE NUM FROM TABLE([schema].FN_TABLE_NUMBERS(1,10,-2));--with 0.01 difference: 1;1.01;1.02;.......;10
If you want to generate the list of numbers 1 - 100 you can use the cartesian product of {1,2,3,4,5,6,6,7,8,9,10} X {0,10,20,30,40,50,60,70,80,90}
https://en.wikipedia.org/wiki/Cartesian_product
Something along the lines of the following:
SELECT
ones.num + tens.num
FROM
(
SELECT 1 num UNION ALL
SELECT 2 num UNION ALL
SELECT 3 num UNION ALL
SELECT 4 num UNION ALL
SELECT 5 num UNION ALL
SELECT 6 num UNION ALL
SELECT 7 num UNION ALL
SELECT 9 num UNION ALL
SELECT 10 num
) as ones
CROSS JOIN
(
SELECT 0 num UNION ALL
SELECT 10 num UNION ALL
SELECT 20 num UNION ALL
SELECT 30 num UNION ALL
SELECT 40 num UNION ALL
SELECT 50 num UNION ALL
SELECT 60 num UNION ALL
SELECT 70 num UNION ALL
SELECT 80 num UNION ALL
SELECT 90 num
) as tens;
I'm not able to test this out on an oracle database, you can place the dual where it belongs but it should work.
SELECT * FROM `DUAL` WHERE id>0 AND id<101
The above query is written in SQL in the database.