I have the below
;with cte as(
Select 1 as Col1 ,NULL as Col2
Union All
Select Null ,2)
select *
from cte
/* Result*/
Col1 Col2
1 NULL
NULL 2
I am looking for
Col1 Col2
1 2
i.e. results should come in a single row.
How can we achieve this?
Without more details about your data, it seems like applying a simple aggregate function like max should do what you are after:
...
select max(col1) as col1, max(col2) as col2
from cte
SELECT MAX(col1) , MAX(col2) FROM cte
You can use any aggregate function like Max() or Min() or Sum() depends on your requirement
.
1With the limited information in your question is this what your trying achieve?
;with cte as(
Select table1.Col1 , table2.Col2 From Table1
JOIN table2
ON table1.col1 = table2.Col1
WHERE table1.Col1 = 1 and table2.Col2 = 2
)
select *
from cte
Using cartesian join we can get the required result:
select t2.a,t1.b from table t1,table t2 where t1.b is not null and t2.a is not null;
Related
The problem is:
select (..)
UNION
select (..)
Result is:
Col1, Col2, Col3
Val1 Text1 Data
Val1 Text2 Data
The problem is that i need to save only 1 row of this two. Col2 value is not same at fact, but the same in business logic.
So, how to get result like this:
Col1, Col2,Col3
Val1 Text1 Data
OR
Col1, Col2, Col3
Val1 Text2 Data
Thank you!
You can place the UNION in a subquery and group again
SELECT
Col1,
MIN(Col2),
Col3
FROM (
SELECT Col1, Col2, Col3
FROM table1 t1
UNION ALL
SELECT Col1, Col2, Col3
FROM table2 t2
) t
GROUP BY
Col1,
Col2;
Note the use of UNION ALL rather than UNION, because you are grouping anyway it is not necessary to de-duplicate first.
Hmmm . . . If you want one row per val, then one method is:
with t1 as ( < query 1 here > ),
t2 as ( < query 2 here > )
select t1.*
from t1
union all
select t2.*
from t2
where not exists (select 1 from t1 where t1.val = t2.val);
I want to be able to select two distinct from col1 and col2 ordered by id.
I'm struggling to do this because when I write the following SQL query...
SELECT DISTINCT col1, col2
FROM table
ORDER BY id
I can't ORDER BY id because it's not in the SELECT statement but if I put id in the SELECT statement it will take the DISTINCT id, col1 and col2. Which is basically the whole table as it is since the id column is unique.
How do I do this?
You can use aggregation, and put an aggregate function in the order by clause:
select col1, col2 from mytable group by col1, col2 order by min(id) limit 10
This is one way to do it:
select A.col1, A.col2
from
(select id, col1, col2
from Tablet
order by id) A
left join
(select min(id) id2, col1, col2
from Tablet
GROUP BY COL1, COL2) B
on A.COL1 = B.COL1 AND A.COL2=b.COL2
where A.id = B.id2
LIMIT 4;
Here is the DEMO
I have the following sql at the begnging.
select col1, col2 from table1
union
select col1, col2 from table2
Now I want to able to do a count the total number of rows in the union set from above, and order by col2. How should I do this?
with a as (
select col1, col2 from table1
union
select col1, col2 from table2
)
select *,count(1) over()
from a
order by col2
;
I am looking for a query where I can get unique values(5) in a table. For example.
The table consists of more 100+ columns. Is there any way I can get unique values.
I am using google big query and tried this option
select col1 col2 ... coln
from tablename
where col1 is not null and col2 is not null
group by col1,col2... coln
order by col1, col2... coln
limit 5
But problem is it gives zero records if all the column are null
Thanks
R
I think you might be able to do this in Google bigquery, assuming that the types for the columns are compatible:
select colname, colval
from (select 'col1' as colname, col1 as colvalue
from t
where col1 is not null
group by col1
limit 5
),
(select 'col2' as colname, col2 as colvalue
from t
where col2 is not null
group by col2
limit 5
),
. . .
For those not familiar with the syntax, a comas in the from clause means union all, not cross join in this dialect. Why did they have to change this?
Try This one, i hope it works
;With CTE as (
select * ,ROW_NUMBER () over (partition by isnull(col1,''),isnull(col2,'')... isnull(coln,'') order by isnull(col1,'')) row_id
from tablename
) select * from CTE where row_id =1
I really dont get this, tried with coalesce() but with no result...
I have one select (very simplified to understand the problem):
select col1,
col2
from table1 t1
where table1.col1='value'
and table1.col2='value2'
and table1.col3='value3'
And i really need a result so if this select resultset is null (and only if it is null) (no result) then the following sql select came to picture
select col1,
col2
from table1 t1
where table1.col1='another_value'
and table1.col2='another_value2'
How can i get this two in to one big select? (any syntax which is recommended is appreciated...)
Something like:
; WITH Base AS (
select col1,
col2
from table1 t1
where table1.col1='value'
and table1.col2='value2'
and table1.col3='value3'
)
, Base2 AS (
select col1,
col2
from table1 t1
where table1.col1='another_value'
and table1.col2='another_value2'
AND NOT EXISTS (SELECT 1 FROM Base) -- HERE!!!
)
SELECT * FROM Base
UNION
SELECT * FROM Base2
and let's hope the SQL optimizer won't run the first query twice :-)
It is a CTE (Common Table Expression)... I used it so I could reuse the first query twice (one in the EXISTS and the other in the SELECT ... UNION)
By using a temporary table
select col1,
col2
INTO #temp1 -- HERE!!!
from table1 t1
where table1.col1='value'
and table1.col2='value2'
and table1.col3='value3'
select col1,
col2
from table1 t1
where table1.col1='another_value'
and table1.col2='another_value2'
AND NOT EXISTS (SELECT 1 FROM #temp1) -- HERE!!!
It could benefit us a little better if you had a little more information in your example. Is there a common value between the two tables that a JOIN can be established?
SELECT col1
,col2
FROM Table1 t1
WHERE table1.col1='value'
and table1.col2='value2'
and table1.col3='value3'
UNION
SELECT col1
,col2
FROM Table2 t2
WHERE table1.col1='another_value'
and table1.col2='another_value2'
WHERE NOT EXISTS (SELECT 1 FROM Table1 t1 WHERE t1.Col1 = t2.Col2)
You can use COALESCE, like this:
select COALESCE (
(select col1,
col2
from table1 t1
where table1.col1='value'
and table1.col2='value2'
and table1.col3='value3')
,
(select col1,
col2
from table1 t1
where table1.col1='another_value'
and table1.col2='another_value2')
)
Here are my ugly solution.
select top 1 with ties
col1,
col2
from table1
where (
col1='value'
and col2='value2'
and col3='value3'
) OR
(
col1='another_value'
and col2='another_value2'
)
order by
CASE
WHEN col1='value'
and col2='value2'
and col3='value3'
THEN 1
WHEN col1='another_value'
and col2='another_value2'
THEN 2 END
SQL Fiddle DEMO