I have a requirement to transpose the column into header.
The Data values is
Column A Column B
-------- --------
AA B
AA C
AD D
The out put should look like this
AA AD
-- --
B
C
D
I tried with pivot but I'm not able to do it without aggregation.
Could someone help me out with this
Based on what you've said, maybe you're after something like:
WITH sample_data AS (SELECT 'AA' col_a, 'B' col_b FROM dual UNION ALL
SELECT 'AA' col_a, 'C' col_b FROM dual UNION ALL
SELECT 'AD' col_a, 'D' col_b FROM dual)
SELECT CASE WHEN col_a = 'AA' THEN col_b END aa,
CASE WHEN col_a = 'AD' THEN col_b END ad
FROM sample_data;
AA AD
-- --
B
C
D
Related
Just wondering why the following select isn't working:
SELECT
A.FIELD1
, (SELECT PCN FROM (select B.PRIORITY, B.PCN
from
TABLE2 B
WHERE B.CUST= A.CUST
ORDER BY B.PRIORITY)
WHERE ROWNUM = 1) AS PCN
FROM TABLE1 A;
ERROR at line 2: ORA-00904: "A"."CUST": invalid identifier
Important to mention:
TABLE1 has as fields FIELD1, CUST.
TABLE2 has as fields PCN, PRIORITY, CUST.
Thanks in advance.
Your query shouldn't give you that error message, on when you remove the outer qiery this would happen
CREATE tABLE TABLE1 (FIELD1 int, CUST int)
INSERT INTO TABLE1 VALUES(1,1)
1 rows affected
CREATE TABLE TABLE2 (PCN int, PRIORITY int, CUST int)
INSERT INTO TABLE2 VALUES (1,1,1)
1 rows affected
SELECT
A.FIELD1
, (SELECT PCN FROM (select B.PRIORITY, B.PCN
from
TABLE2 B
WHERE B.CUST= A.CUST
ORDER BY B.PRIORITY)
WHERE ROWNUM = 1) AS PCN
FROM TABLE1 A;
FIELD1
PCN
1
1
fiddle
You can't nest inline selects (more than one level) without losing the ability of the inner nested selects being able to reference the parent block. So your query on TABLE2 cannot see the columns from TABLE1 because of this nesting.
Try this:
SELECT a.field1,
pcn.pcn
FROM table1 a,
(SELECT b.cust,
b.priority,
b.pcn,
ROW_NUMBER() OVER (PARTITION BY b.cust ORDER BY b.priority DESC) seq
FROM table2 b) pcn
WHERE a.cust = pcn.cust(+)
AND pcn.seq(+) = 1
That will work well for report queries. If you end up adding a filter on a specific customer, then you would be better off using OUTER APPLY if you have a recent-enough version of Oracle that supports that.
You could try this:
SELECT
A.FIELD1
, (SELECT B.PCN
from
TABLE2 B
WHERE B.CUST= A.CUST
ORDER BY B.PRIORITY
FETCH FIRST 1 ROWS ONLY) AS PCN
FROM TABLE1 A;
FETCH FIRST 1 ROWS ONLY gets you the first ordered record. Works on 12c and up and supports nesting, and no 2nd subquery needed.
Yet another option might be a CTE.
Sample data:
SQL> with
2 table1 (field1, cust) as
3 (select 1, 100 from dual union all
4 select 2, 200 from dual
5 ),
6 table2 (pcn, priority, cust) as
7 (select 10, 1, 100 from dual union all
8 select 20, 2, 100 from dual union all
9 select 30, 1, 200 from dual
10 ),
Query begins here. Rank rows by priority, and then fetch the ones that rank as the highest (line #20):
11 temp as
12 (select a.field1,
13 b.pcn,
14 rank() over (partition by a.field1 order by b.priority desc) rnk
15 from table1 a join table2 b on a.cust = b.cust
16 )
17 select field1,
18 pcn
19 from temp
20 where rnk = 1;
FIELD1 PCN
---------- ----------
1 20
2 30
SQL>
You may use first aggregate function to achieve the same (assuming that you have completely deterministic order by) functionality without nested subquery:
select
a.field1
, (
select max(b.pcn) keep(dense_rank first order by b.priority)
from table2 b
where b.cust = a.cust
) as pcn
from table1 a
which for this sample data
insert into table1 values(1,1);
insert into table1 values(2,2);
insert into table2 values(1,1,1);
insert into table2 values(2,2,1)
returns
FIELD1
PCN
1
1
2
(null)
SQL fiddle
For example, I have a table with these values:
ID
Date
Col1
Col2
Col3
Col4
1
01/11/2021
A
A
B
2
01/11/2021
B
B
The A and B values are dynamic, they can be other characters as well.
Now I need somehow to get to the result that id 1 has 2 occurences of A and one of B. Id 2 has 0 occurences of A and 2 occurences of B.
I'm using dynamic SQL to do this:
for v_record in table_cursor
loop
for i in 1 .. 4
loop
v_query := 'select col'||i||' from table where id = '||v_record.id;
execute immediate v_query into v_char;
if v_char = "any letter I'm checking" then
amount := amount + 1;
end if;
end loop;
-- do somehting with the amount
end loop;
But there has to be a better much more efficient way to do this.
I don't have that much knowledge of plsql and I really don't know how to formulate this question in google. I've looked into pivot, but I don't think that will help me out in this case.
I'd appreciate it if someone could help me out.
Assuming the number of columns would be fixed at four, you could use a union aggregation approach here:
WITH cte AS (
SELECT ID, Col1 AS val FROM yourTable UNION ALL
SELECT ID, Col2 FROM yourTable UNION ALL
SELECT ID, Col3 FROM yourTable UNION ALL
SELECT ID, Col4 FROM yourTable
)
SELECT
t1.ID,
t2.val,
COUNT(c.ID) AS cnt
FROM (SELECT DISTINCT ID FROM yourTable) t1
CROSS JOIN (SELECT DISTINCT val FROM cte) t2
LEFT JOIN cte c
ON c.ID = t1.ID AND
c.val = t2.val
WHERE
t2.val IS NOT NULL
GROUP BY
t1.ID,
t2.val;
This produces:
Demo
I have a source table which contains values as :
Col1 Col2
A B
B C
E F
F G
G H
X Y
In this scenario A is a parent and b is child of A
And C is a grand child of A, parent and it's child with grand child's should come in one single line.
So the expected output is
Output :
A B C
E F G H
X Y
Oracle 11gR2 Setup:
CREATE TABLE table_name ( Col1, Col2 ) AS
SELECT 'A', 'B' FROM DUAL UNION ALL
SELECT 'B', 'C' FROM DUAL UNION ALL
SELECT 'E', 'F' FROM DUAL UNION ALL
SELECT 'F', 'G' FROM DUAL UNION ALL
SELECT 'G', 'H' FROM DUAL UNION ALL
SELECT 'X', 'Y' FROM DUAL;
Query:
SELECT SUBSTR( SYS_CONNECT_BY_PATH( Col1, ' ' ) || ' ' || Col2, 2 ) AS path
FROM table_name
WHERE CONNECT_BY_ISLEAF = 1
START WITH Col1 NOT IN ( SELECT Col2 FROM table_name )
CONNECT BY PRIOR Col2 = Col1;
Explanation:
Start (line 4) with each Col1 where there is not a parent row identified by a corresponding Col2 value and create a hierarchical query connecting (Line 5) Col1 the the prior parent row.
Filter the output only to those rows which are a leaf of the hierarchical tree (line 3) - i.e. those with no children.
You can then use SYS_CONNECT_BY_PATH to generate a string containing all the Col1 values from the root to the leaf of each branch of the tree generated by the hierarchy and concatenate that with the final Col2 value at the leaf. SUBSTR is used to remove the leading space delimiter that SYS_CONNECT_BY_PATH prepends to each entry in the path.
Output:
PATH
-------
A B C
E F G H
X Y
Is it what you search for?
SQL> with
2 src as (select 'A' p#, 'B' c# from dual union all
3 select 'B' p#, 'C' c# from dual union all
4 select 'E' p#, 'F' c# from dual union all
5 select 'F' p#, 'G' c# from dual union all
6 select 'G' p#, 'H' c# from dual union all
7 select 'X' p#, 'Y' c# from dual)
8 select
9 max(trim(sys_connect_by_path(p#, ' ') || ' ' || c#)) r#
10 from
11 src
12 start with
13 p# not in (select c# from src)
14 connect by p# = prior c#
15 group by connect_by_root(p#);
R#
--------------------------------------------------------------------------------
A B C
X Y
E F G H
May be this code can help you.
WITH t1(id, parent_id) AS (
-- Anchor member.
SELECT id,
PARENT
FROM table
WHERE id = 'A'
UNION ALL
-- Recursive member.
SELECT t2.id,
t2.PARENT
FROM table t2, table t1
WHERE t2.PARENT = t1.id
)
SELECT id, parent_id
FROM t1;
I want to match Col1 from Table a to colum1 from table B.
A B
123 123-ab
234 234-bc
3443 3443-dd
However, value in table b has concatenated data. I want to match only the characters until before special character occurs(-).
I tried this : substr(table1.a,1,3) = substr(table2.b,1,3)
But this doesn’t work as some values have 4 digits.
use join and substr
select * from table_a
inner join table_b on table_a.col_a = substr(table_b.col_b, 1, length(table_a.col_a);
Using REGEXP_SUBSTR() to match on one or more numbers from the beginning of the string up to but not including the first hyphen:
SQL> with a(col1) as (
select '123' from dual union
select '234' from dual union
select '3443' from dual
),
b(col1) as (
select '123-ab' from dual union
select '234-bc' from dual union
select '3443-dd' from dual
)
select a.col1, b.col1
from a, b
where a.col1 = regexp_substr(b.col1, '^(\d+)-', 1, 1, NULL, 1);
COL1 COL1
---- -------
123 123-ab
234 234-bc
3443 3443-dd
SQL>
I have a dynamic data set such as 'AAA','TTT','CCC','FFF'
I need to match this data against a column C in a table T
e.g. I have in the table T for Column C, 'AAA','BBB','DDD','FFF'
I need to return something like (show null if the value doesn't exist in Column)
'AAA'
'TTT' NULL
'CCC' NULL
'FFF'
I don't want to drop the set into table as my data changes frequently and need to query quickly.
Any ideas greatly appreciated.
Is this what you're after ??
with w_data as (
select 'AAA' c from dual union all
select 'TTT' c from dual union all
select 'CCC' c from dual union all
select 'FFF' c from dual
),
w_table_t as (
select 'AAA' c from dual union all
select 'BBB' c from dual union all
select 'DDD' c from dual union all
select 'FFF' c from dual
)
select d.c,
NVL2(t.c, '', 'NULL' )
from w_data d
LEFT OUTER JOIN
w_table_t t
ON t.c = d.c
/
results:
C NVL2
--- ----
AAA
FFF
TTT NULL
CCC NULL
Try this (EDITED) :
with data_set as (
select 'AAA' col from dual union
select 'TTT' col from dual union
select 'CCC' col from dual union
select 'FFF' col from dual
)
select case when d.col in (select column_C from table_T) then d.col
else d.col||' Null' end as col_name
from data_set d
/