I have a query that I need translated into Informatica
SELECT COL1, COL2, COL3 FROM TABLE1
CROSS JOIN
(SELECT MAX(COL3) FROM TABLE1)
In Informatica I have a Source going to a joiner to get COL1 and COL2 and an aggregator coming out of the same source to get the MAX(COL3). However, when I use a JOINER to connect them, I cannot. What is the appropriate way of doing this?
For joining same source pipelines you need to select "input is sorted" in the joiner properties.
You can do it using SQL-override:
SELECT max(col3) over () as max_col3, COL1, COL2, COL3 FROM TABLE1
Related
How can I achieve this to Select to one row only dynamically since
the objective is to get the uniqueness even on multiple columns
select distinct
coalesce(least(ColA, ColB),cola,colb) A1, greatest(ColA, ColB) B1
from T
The best solution is to use UNION
select colA from your_table
union
select colB from your_table;
Update:
If you want to find the duplicate then use the EXISTS as follows:
SELECT COLA, COLB FROM YOUR_TABLE T1
WHERE EXISTS (SELECT 1 FROM YOUR_tABLE T2
WHERE T2.COLA = T1.COLB OR T2.COLB = T1.COLA)
If I correctly understand words: objective is to get the uniqueness even on multiple columns, number of columns may vary, table can contain 2, 3 or more columns.
In this case you have several options, for example you can unpivot values, sort, pivot and take unique values. The exact code depends on Oracle version.
Second option is listagg(), but it has limited length and you should use separators not appearing in values.
Another option is to compare data as collections. Here I used dbms_debug_vc2coll which is simple table of varchars. Multiset except does main job:
with t as (select rownum rn, col1, col2, col3,
sys.dbms_debug_vc2coll(col1, col2, col3) as coll
from test )
select col1, col2, col3 from t a
where not exists (
select 1 from t b where b.rn < a.rn and a.coll multiset except b.coll is empty )
dbfiddle with 3-column table, nulls and different test cases
problem in avoiding duplicates using XMLAGG function
A table which is having multiple records. where each record has one column contains repetitive date.
Using XMLAGG function in the following sql
select col1, col2, XMLAGG(XMLELEMENT(E, colname || ',')).EXTRACT('//text()')
from table
group by col1, col2
i get the following output
col1 col2 col3
hareesh apartment residential, commercial, residential, residential
But i need the following output as
col3 : residential, commercial.
Anyone help me
Try using a subquery to remove duplicates:
SELECT col1, col2, XMLAGG(XMLELEMENT(E, colname || ',')).EXTRACT('//text()')
FROM (SELECT DISTINCT col1, col2, colname FROM table)
GROUP BY col1, col2
I have the following query which works fine.
SELECT A.*
FROM
(
SELECT 'ABC','DEF' FROM DUMMY
UNION ALL
SELECT col1,col2 FROM DUMMY
) A;
I want to apply the like key word on the first column returned by the nested query. I tried the following:
SELECT col1, col2
FROM
(
SELECT 'ABC','DEF' FROM DUMMY
UNION ALL
SELECT col1,col2 FROM DUMMY
) A
WHERE COL1 LIKE 'A%';
But the above query did not work. I'm getting the error: ORA-00904: "COL1": invalid identifier.
The fiddle link for the same is as follows: http://sqlfiddle.com/#!4/1c54b/7
Please could anybody guide me on how I can achieve the same?
Edit: I'm also trying to get the columns from the existing table as well.
Thanks in advance.
When using union, column names or aliases have to be matched on both tables.
You can call already defined column names and aliases.
Do not forget define column alias('ABC' as col1)
SELECT col1, col2
FROM
(
SELECT 'ABC' as col1,'DEF' as col2 FROM DUMMY
UNION ALL
SELECT 'GHI' as col1,'JKL' as col2 FROM DUMMY
) A
WHERE COL1 LIKE 'A%';
I think you are trying something like;
SELECT col1, col2
FROM
(
SELECT col1,col2 FROM DUMMY
UNION ALL
SELECT col1,col2 FROM DUMMY2
) A
WHERE col1 LIKE 'A%';
Have a look at another sample from me on here
I am normally using MS SQL and am a total rookie with oracle.
I get an oracle driver problem when I use the ORDER BY statement in my subquery.
Example (my real statement is much more complex but I doubt it matters to my problem - I can post it if needed):
SELECT col1
, col2
, (SELECT colsub FROM subtbl WHERE idsub = tbl.id AND ROWNUM=1 ORDER BY coldate) col3
FROM tbl
If I do such a construct I get an odbc driver error: ORA-00907: Right bracket is missing (translated from german, so bracket might be other word :)).
If I remove the ORDER BY coldate everything works fine. I couldn't find any reason why, so what do I wrong?
It doesn't make any sense to write the ROWNUM and the ORDER BY this way since the ORDER BY is evaluated after the WHERE clause, meaning that it has no effect in this case. An example is given in this question.
This also gets a little more complicated because it is hard to join a sub-query back to the main query if it is nested too deeply.
The query below won't necessarily work because you can't join between tbl and subtbl in this way.
SELECT
col1,
col2,
(
select colsub
from (
SELECT colsub
FROM subtbl
WHERE idsub = tbl.id
order by coldate
)
where rownum = 1
) as col3
FROM tbl
So you'll need to use some sort of analytic function as shown in the example below:
SELECT
col1,
col2,
(SELECT max(colsub) keep (dense_rank first order by coldate) as colsub
FROM subtbl
WHERE idsub = tbl.id
group by idsub
) col3
FROM tbl
The FIRST analytic function is more complicated than it needs to be but it will get the job done.
Another option would be to use the ROW_NUMBER analytic function which would also solve the problem.
SELECT
col1,
col2,
(select colsub
from (
SELECT
idsub,
row_number() over (partition by idsub order by coldate) as rown,
colsub
FROM subtbl a
) a
WHERE a.idsub = tbl.id
and a.rown = 1
) col3
FROM tbl
What you are doing wrong is clear. You are using an order by in a sub-query. It does not make any sense using an order by in a sub-query so why would you want to do that?
Also you are using an order by on a sub-query that always returns 1 row. That also does not make any sense.
If you want the query result to be sorted use an order by at the highest level.
try:
select
col1,
col2,
colsub
from(
select
col1 ,
col2 ,
coldate,
max(coldate) over (partition by st.idsub) max_coldate
from
tbl t,
subtbl st
where
st.idsub = t.id)
where
coldate = max_coldate
update tablename set (col1,col2,col3) = (select col1,col2,col3 from tableName2 order by tablenmae2.col4) return error
Missing ). The query works fine if I remove the order by clause
ORDER BY is not allowed in a subquery within an UPDATE. So you get the error "Missing )" because the parser expects the subquery to end at the point that you have ORDER BY.
What is the ORDER BY intended to do?
What you probably have in mind is something like:
UPDATE TableName
SET (Col1, Col2, Col3) = (SELECT T2.Col1, T2.Col2, T2.Col3
FROM TableName2 AS T2
WHERE TableName.Col4 = T2.Col4
)
WHERE EXISTS(SELECT * FROM TableName2 AS T2 WHERE TableName.Col4 = T2.Col4);
This clumsy looking operation:
Grabs rows from TableName2 that match TableName on the value in Col4 and updates TableName with the values from the corresponding columns.
Ensures that only rows in TableName with a corresponding row in TableName2 are altered; if you drop the WHERE clause from the UPDATE, you replace the values in Col1, Col2, and Col3 with nulls if there are rows in TableName without a matching entry in TableName2.
Some DBMS also support an update-join notation to reduce the ghastliness of this notation.