I have a table that is all NVARCHAR. I am trying to cast a column into a date; however, there appears to be some value in the column that will not cast as date and is throwing an error halfway through.
I am trying to find the rows that are problematic. However, I don't know how to equal a result to an error..
SELECT id,
CASE WHEN CAST(date_of_birth AS DATE) = error
THEN 1
ELSE 0
FROM TABLE1
Table1
id date_of_birth
1 05/05/1934
2 feathers
3 06/06/1843
Expected results
id date_of_birth
1 0
2 1
3 0
Any advice on how to isolate the problematic rows?
Use TRY_CAST():
SELECT id,
(CASE WHEN TRY_CAST(date_of_birth AS DATE) IS NULL AND date_of_birth IS NOT NULL
THEN 1
ELSE 0
END) as is_bad_date_of_birth
FROM TABLE1;
To identify error rows, use the ISDATE function:
SELECT * FROM TABLE WHERE ISDATE(date_of_birth)=0
Related
I have a field called RecordType that has three different records, 1, 2, 3. Each hold different records. I want to take the the balance from another field I have called Limit from RecordType 1 and insert it into RecordType 3 but I'm just unsure on how to do this. This will be going into a Crystal Report and I want to be able to suppress the RecordType 1 altogether.
I've tried a simple case statement but that's about it, I can't really think of any other ways to do it (I'm sure there's loads).
CASE
WHEN FA.RecordType = 3 THEN
FA.Limit
END AS LimitTest
Current results
Record Type
Limit
1
5,000,301
2
0
3
0
Expected Results
Record Type
Limit
2
0
3
5,000,301
You seem to want to combine the limit for types 1 and 3. You can do this with aggregation on an expression:
select (case when recordtype = 1 then 3 else recordtype end) as recordtype,
sum(limit) as limit
from t
group by (case when recordtype = 1 then 3 else recordtype end);
You can try using sub-query and a Case statement in your select statement, for example:
SELECT [RecordType],
(CASE [RECORDTYPE] WHEN 3 THEN
(SELECT LIMIT from Table_1 WHERE RECORDTYPE = 1)
ELSE LIMIT END) LimitTest
FROM TABLE_1 WHERE RECORDTYPE <> 1
You said:
Sorry my formatting is terrible I'm not sure how to do it properly. But to answer your question no type 1 & 3 will never have the same value as 3 never has a value. I want to basically move the value from type 1 into type 3
Which makes me think that this would be the simplest:
DELETE FROM table WHERE RecordType = 3
UPDATE table SET RecordType = 3 WHERE RecordType = 1
3 never has a value so let's get rid of them first, then 1 has the value but we want it to be 3 so just update all the 1s to be 3s instead
If you're not into deleting it, just mask it instead:
SELECT 3 as RecordType, Limit FROM table WHERE RecordType = 1
If you want to move value from type 1 to type 3 then do simple update in your query.
update t set t.value= t1.value from table as t , table as t1 where t.recordtype=3 and t1.recordtype=1
or
delete from table where recordtype = 3
update recordtype set recordtype=1 where recordtype=3
This will work may be
SELECT
IIF(A.RECORDTYPE = 1,3,A.RECORDTYPE) AS RECORDTYPE,
A.LIMIT
FROM
(
SELECT 1 RECORDTYPE,5000301 LIMIT UNION ALL
SELECT 2 RECORDTYPE,0 LIMIT UNION ALL
SELECT 3 RECORDTYPE,0 LIMIT
) A
WHERE A.RECORDTYPE IN (1,2)
ORDER BY RECORDTYPE
Check this if works for you.
I have table whose column is just the length of a session and I would like to return the number of session that have zero length and the number of sessions that have length greater than zero.
I can do that with two separate commands
select count(session_length) from my_table where session_length=0
select count(session_length) from my_table where session_length>0
But I would like to see the results combined in one table
You can do it with one query using conditional aggregation.
select
count(case when session_length = 0 then 1 end),
count(case when session_length > 0 then 1 end)
from my_table
select 1 as QryNo, count(session_length) as SessLen
from my_table
where session_length=0
union
select 2 as QryNo, count(session_length) as SessLen
from my_table
where session_length>0
or
select
case
when session_length = 0 then 1
else 2
end as QryNo,
count(session_length) as SessLen
from my_table
This may be too simple so apologies if I have misread your query but Can you use
select count(session_length) from my_table where session_length >= 0
Again, Apologies if this is not what you're looking for.
I have a table where the id field (not a primary key) contains either 1 or null. Over the past several years, any given part could have been entered multiple times with one, or both of these possible options.
I'm trying to write a statement that will return some value if there is ever a 1 associated with the select statement. There are lots of semi-duplicate rows, some with 1 and some with null, but if there is ever a 1, I want to return true, and if there are only null values, I want to return false. I'm not sure how to code this though.
If this is my SELECT part,id from table where part = "ABC1234" statement
part id
ABC1234 1
ABC1234 null
ABC1234 null
ABC1234 null
ABC1234 1
I want to write a statement that returns true, because 1 exists in at least one of these rows.
The closest I've come to this is by using a CASE statement, but I'm not quite there yet:
SELECT
a1.part part,
CASE WHEN a2.id is not null
THEN
'true'
ELSE
'false'
END AS id
from table.parts a1, table.ids a2 where a1.part = "ABC1234" and a1.key = a2.key;
I also tried the following case:
CASE WHEN exists
(SELECT id from table.ids where id = 1)
THEN
but I got the error subqueries are not supported in the select list
For the above SELECT statement, how do I return 1 single line that reads:
part id
ABC1234 true
You can use conditional aggregation to check if a part has atleast one row with id=1.
SELECT part,'True' id
from parts
group by part
having count(case when id = 1 then 1 end) >= 1
To return false when the id's are all nulls use
select part, case when id_true>=1 then 'True'
when id_false>=1 and id_true=0 then 'False' end id
from (
SELECT part,
count(case when id = 1 then 1 end) id_true,
count(case when id is null then 1 end) id_false,
from parts
group by part) t
I am attempting to create a row called Flag that will keep a count of when Value is above 2. Later I will need to sum flag as a count.
I currently have:
CASE
WHEN Value > 2
THEN 1
ELSE 0
END AS 'Flag',
CASE
WHEN 'Flag' = 1
THEN 1
ELSE 0
END AS 'FollowedUpCorrectly'
I receive the error:
Conversion failed when converting the varchar value 'Flag' to data
type int.
How can I force the 1 or 0 to be an INT in order to do later math?
I've looked around and I can't seem to find a way that fits.
To be able to use previously created columns in the select, you'll need to use for example outer apply, with something like this:
select
*
from table1
outer apply (
select CASE WHEN Value > 2 THEN 1 ELSE 0 END AS Flag
) X
outer apply (
select CASE WHEN X.Flag = 1 THEN 1 ELSE 0 END AS FollowedUpCorrectly
) Y
Test this in SQL Fiddle
You could use CTE or a subquery to create a flag and then do your case statement as needed in the outer query like this:
;WITH q1
AS (
SELECT
col1
,col2
,col3
,CASE
WHEN Value > 2
THEN 1
ELSE 0
END AS 'Flag'
FROM your_table --change this to match your table and column name
)
SELECT q1.col1
,q1.col2
,q1.col3
,CASE
WHEN q1.Flag = 1
THEN 1
ELSE 0
END AS 'FollowedUpCorrectly'
FROM q1;
I might misunderstand what you are after.
CASE
WHEN Value > 2
THEN 1
ELSE 0
END AS 'Flag',
CASE
WHEN 'Flag' = 1
THEN 1
ELSE 0
END AS 'FollowedUpCorrectly'
If these two lines are in the same code block, 'Flag' is unknown in the second Case Statement.
Update: As Siyual has pointed out, Flag is a string literal. Try changing the name to something that is not a reserved word.
You are comparing a string ('Flag') to an int (1). Perhaps you meant to refer to the first case that you named 'Flag'. If so, try referring to it without using the single quotes. Then the analyzer will recognize it and accept it as an int, which it is. But 'Flag' is a string. Flag is an int.
I am trying to get my result as either 1 or 0 based on if the column note is empty or not
column is a varchar and i want the result from the query to give me a boolean value for that column note
SELECT id, product, note FROM myTABLE
what i tired is,
SELECT id, product, CASE WHEN ISNULL(note) THEN 0 ELSE 1 FROM myTable
but i am getting an error... i am sure there is simple fix to this i am missing so please help. thank you.
Try
SELECT id, product,CASE WHEN note IS NULL THEN 0 ELSE 1 END as SomeColumn
FROM myTable
to check for blank and null as well, use NULLIF
SELECT id, product,
CASE WHEN NULLIF(note,'') IS NULL THEN 0 ELSE 1 END as SomeColumn
FROM myTable