I have a table with several rows, and several columns. It looks like this:
Name Description
X PASS
X PASS
X FAIL
I want it to return only one row. If all of them are PASS, return PASS.
If one or more of them are FAIL, then return FAIL.
What's the best way to go about achieving this in SQL Server 2008?
EDIT: The values in the name column will always be the same.
Depending on the database indexes, and assuming you want one row returned per unique name, I would look at the performance of
select
name,
min([description]) as description
from
tableA
group by
name
compared to the other solutions
SELECT TOP 1 CASE Description WHEN 'FAIL' THEN 'FAIL' ELSE 'PASS' END
FROM DaTable
ORDER BY Description
OP: Is it possible that the table is empty? In that case this query won't return any rows, obviously.
EDIT
According to aquinas's comment I created a modified query without ordering:
SELECT CASE COUNT(Description) WHEN 0 THEN 'FAIL' ELSE 'PASS' END
FROM DaTable
WHERE Description = 'FAIL'
This query will return PASS if DaTable is empty.
This is the simplest solution you will find:
SELECT MIN(Description) FROM tbl
If there's at least one FAIL, then our result column will contain FAIL, otherwise, it will contain PASS.
You can use EXISTS to get the existance of a row containing "FAIL".
You could also try something like:
SELECT TOP 1 COALESCE(tFail.Description,t.Description)
FROM myTable AS t
LEFT JOIN myTable AS tFail ON tFail.Name = t.Name AND tFail.Description = 'FAIL'
WHERE t.Name = 'x'
Here is the query:
--DROP TABLE result
CREATE TABLE result(Name varchar(10),Description varchar(20))
--select * from result
INSERT INTO result
VALUES('X','PASS'),('X','PASS'),('X','FAIL')
;WITH CTE(descp,cnt) as (SELECT [description],COUNT(*) as cnt FROM result group by [description])
SELECT CASE WHEN COUNT(*) > 1 then 'FAIL' when COUNT(*)=1 then MAX(descp) else 'PASS' END FROM CTE
Related
I want to be able to check if we have a column and if not, then we just want to add an empty column,
IF Users.[parties] = '' OR NULL
BEGIN
SELECT [parties]
FROM Users
UNION
SELECT 'Empty'
END
The Users.[parties], we check to see if we have a column but if we don't, it will result in a crash, in the case for this event I thought it would be best just to add an empty column with the name of Empty but I can't get the code to work above.
If we do have columns, the results will be something like...
ColumnsName ColumnAge
data 33
data 22
But when there isn't a column, it crashes and ideally I would like it to just have an empty column like this,
EmptyColumn
The code below checks whether a column exists in the table, in our case the name of the column is columnName and the name of the table is tableName.
IF COL_LENGTH('schemaName.tableName', 'columnName') IS NOT NULL
BEGIN
-- Column exists
SELECT [parties] FROM Users
END
ELSE
BEGIN
-- Column does not exists
SELECT 'Empty'[parties]
END
I think you just want
IF EXISTS(
SELECT 1
FROM Sys.Columns
WHERE Name = N'parties'
AND
Object_ID = Object_ID(N'SchemaName.Users')
)
BEGIN
SELECT parties
FROM Users;
END
ELSE
BEGIN
SELECT 'EmptyColumn' EmptyColumn -- or NULL EmptyColumn
FROM Users;
END
I'll try with this: (I'm not sure it works)
select case when ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) =0 --count rows
then 'empty' -- if 0 output empty
else parties end as parties --else ouputs the result
from your_table
This is a more 'standard' approach
CREATE VIEW user_filled as
SELECT [parties]
FROM Users
UNION
SELECT 'EMPTY'
and when you query it (if needed -> on count(*))
select count(*)
from user_filled
where parties <> 'EMPTY'
on join
select *
from user_filled join other_table
on (user_filled <> 'EMPTY and userfilled.key= other_table.key)
NOTE: put the clause into the ON so it's filtered out BEFORE the join is made
I have the below query
With max_cm1 as (select * from tableA)
Select * ,
CASE WHEN TO_CHAR(CCP2.END_DATE,'MM/DD/YYYY') <> '09/09/9000' THEN 'CLOSED'
WHEN MAX_CM1.MAX_ROLE_CM IS NOT NULL AND HIST.PCMUID IS NOT NULL THEN 'ASSIGNED'
ELSE 'UNASSIGNED'
END STATUS
from max_cm1
Now I need to filter on the case statement. How can I do this?
You can use an alias eg: m.
With max_cm1 as (select * from tableA)
Select m.* ,
CASE WHEN TO_CHAR(CCP2.END_DATE,'MM/DD/YYYY') <> '09/09/9000' THEN 'CLOSED'
WHEN MAX_CM1.MAX_ROLE_CM IS NOT NULL AND HIST.PCMUID IS NOT NULL THEN 'ASSIGNED'
ELSE 'UNASSIGNED'
END STATUS
from max_cm1 m;
In your case, you don't need a CTE unless you are joining it with other table with some expressions in CTE. Directly you can fetch from table A with the same method if you are only interested in select '*'.
Your question is unclear. Also, the query as given is somewhat confusing, as it qualifies some columns with table names (CCP2 and HIST) that don't appear elsewhere in the query. Further, as written there seems to be no purpose to the CTE at all.
I'm assuming that what you want is to include the given CASE expression in the result set, but also use it within the WHERE clause to filter the results (e.g. WHERE CASE ... END = 'CLOSED'. The simple way to do this is to repeat the CASE expression; but of course duplicating logic is never a good choice. So the better way, which I think is the point of your question, is to include that derived column in a CTE so you can then refer to it by name in the WHERE clause.
It also looks like you are probably running into the issue of trying to select all columns (*) plus a derived column. The way around this is to qualify the * with the table name, or an alias as indicated in one of the other answers.
Putting this all together, I believe you want something like the following. I'm keeping the column expressions (e.g. HIST.PCMUID) as you wrote them although as written they make no sense. I'm guessing that tableA really represents some join of multiple tables.
WITH max_cm1 AS (
SELECT tableA.* ,
CASE WHEN TO_CHAR(CCP2.END_DATE,'MM/DD/YYYY') <> '09/09/9000' THEN 'CLOSED'
WHEN MAX_CM1.MAX_ROLE_CM IS NOT NULL AND HIST.PCMUID IS NOT NULL THEN
'ASSIGNED'
ELSE 'UNASSIGNED'
END STATUS
FROM tableA
)
SELECT *
FROM max_cm1
WHERE status = 'CLOSED'
Can some one please explain how to pass multiple values to oracle case statement Then
SELECT *
FROM impl_debitor_information
WHERE soft_delete='F'
AND SHOP_ID ='4987bc1b-c0a8-6cb7-12f4-0243011f7099'
AND (debitor_type IS NULL
OR debitor_type IN (CASE
WHEN (SELECT techfund_debitor_enabled
FROM impl_shop
WHERE shop_id='4987bc1b-c0a8-6cb7-12f4-0243011f7099') = 'YES' THEN ('T','D')
ELSE 'D'
END))
If values from
select techfund_debitor_enabled from impl_shop where shop_id='4987bc1b-c0a8-6cb7-12f4-0243011f7099' is "YES" then I need to pass 2 values to in clause, if not single value
Thanks in advance
CASE will only return a single value. You must rewrite your query. Something like this:
SELECT *
FROM impl_debitor_information i, impl_shop where shop_id s
WHERE d.soft_delete='F'
AND d.shop_id ='4987bc1b-c0a8-6cb7-12f4-0243011f7099'
AND d.shop_id = s.shop_id
AND (d.debitor_type IS NULL
OR (d.debitor_type IN ('T','D') AND s.techfund_debitor_enabled = 'YES')
OR (d.debitor_type IN ('D') AND s.techfund_debitor_enabled <> 'YES'))
There might be errors in it, I didn't test the query.
How to change column value by CASE command depending on condition without giving adding a new column to table?
The only way I know is by adding new column:
SELECT
t1.*
,CASE
what='costs' THEN amount*(-1)
ELSE
sales
END AS NewAmount
FROM t1
Is there a way to get the results as on the picture below? Note that sometimes the condition is specified by values in more than one column (what=costs AND country=Atlantida)
Select just the columns that you want:
SELECT t1.what,
(CASE WHEN what = 'costs' THEN amount*(-1)
ELSE sales
END) AS Amount
FROM t1
Yes, there is way,
Instead of select *, use required column names only.
SELECT
t1.what
,CASE
WHEN what='costs' THEN amount*(-1)
ELSE
sales
END AS Amount
FROM t1
Don't you want amount when not cost?
SELECT
t1.*
,CASE when what='costs' THEN amount*(-1)
ELSE
amount
END AS NewAmount
FROM t1
I have to do a lot of queries with this kind of logic:
Check if a table contains a record for a patient
If it does return then 'Yes'
Else return 'No'
Now, I want to create a procedure that will do this, so I tried to create a function that will do the above, but ended up in dynamic queries which is not possible in functions.
Is it possible to achieve this? How can I go about this?
PS:
Maybe something like:
select
(IF EXISTS(SELECT * FROM Dtl_Patient WHERE Pk = 3990 select 'Yes' else select 'No')) as output from dtl_AllPatient;
Try CASE
SELECT
CASE WHEN EXISTS (SELECT PatientID FROM Table2 T2 WHERE T2.PatientID =T1.PatientID)
THEN 'YES' ELSE 'NO' END AS PatientExists
FROM
Table1 T1
EDIT
SELECT
CASE WHEN EXISTS (SELECT Pk FROM Dtl_Patient WHERE Pk = 3990) THEN 'YES' ELSE 'NO' END AS PatientExists
FROM dtl_AllPatient
check this EXISTS Condition
The SQL EXISTS condition is considered "to be met" if the subquery returns at least one row.