I am creating a store procedure and i am wondering how can i add a case block in an Add statement inside the where statement.That case statement checks an input parameter and depending its value it will change the condition from greater that to smaller than and of course be added to the add conditions
So a part of the query is like:
WHERE
AND BM.Example1 IS NOT NULL
AND BM.Example2 IS NOT NULL
AND ( Case When #inputParamter= 'A' THEN AND BM.Example < 0 ELSE And BM.Example> 0 )
ORDER BY 'SEG' ASC, 'CCY' ASC
So by this approach i am thinking to extract an add statement depending on the input parameter but unfortunately i keep getting syntax errors.
Is that possible?
Yepp, just use this:
AND (( #inputParamter= 'A' AND BM.Example < 0) OR ( #inputParamter<>'A' AND BM.Example> 0) )
However, be carefull with NULL, you have to put it in the logic as a third option.
here is a similar answer using case
AND ( Case When #inputParamter = 'A' AND BM.Example < 0 THEN 'Y'
When #inputParamter <> 'A' AND BM.Example > 0 THEN 'Y' ELSE 'N' END = 'Y')
Related
I am trying to use the SUBSTR and NVL functions inside the case. The case is in the where clause of the select statement.
The code below gives the following error:
ORA-00905: missing keyword
AND ( CASE
WHEN SUBSTR(upper(p_open_invoice),1,1) = 'Y' THEN
NVL(P.AMOUNT_DUE_REMAINING,0) = 0
ELSE
1=1
END)
This looks like a syntax error around equal operator of NVL function.
That is not how case expressions work (in Oracle) -- there is no boolean type to return.
The simplest method is to remove the `case and express this as simple logic:
AND (SUBSTR(upper(p_open_invoice), 1, 1) <> 'Y' OR
COALESCE(P.AMOUNT_DUE_REMAINING, 0) = 0
)
If p_open_invoice can be NULL, you need to take that into account as well.
You cannot use a collation as a result for case..when statements, it's better converting the condition to
AND (( SUBSTR(upper(p_open_invoice),1,1) = 'Y' AND NVL(P.AMOUNT_DUE_REMAINING,0) = 0 )
OR SUBSTR(upper(p_open_invoice),1,1) != 'Y' )
If you're accustomed to programming in PL/SQL you may have seen that there's a BOOLEAN type in PL/SQL. However, this is not true in the Oracle database itself. The way I usually work around this is to use character expressions which return 'Y' or 'N' instead of TRUE or FALSE.
Keeping this in mind - if you really want to use a CASE expression similar to what you had originally you can use the following:
AND CASE
WHEN SUBSTR(upper(p_open_invoice),1,1) = 'Y'
THEN CASE
WHEN NVL(P.AMOUNT_DUE_REMAINING,0) = 0 THEN 'Y'
ELSE 'N'
END
ELSE 'Y'
END = 'Y'
Here the CASE expression returns either 'Y' or 'N', which is then compared with 'Y'.
I'm pulling data from an existing table using a stored procedure that has some yes or no choices that the user picks on the front end through a checkbox. I want to limit writing a bunch of different If statements for every choice they make.
This portion of my where clause works. Data is either Y or N for this column.
Where... and IsSigned = Case When #IncludeSigned = 'Y' then IsSigned else 'N' end
I would like to add to the where using is not null and not like if this is possible between the square brackets. So far I have
and SignatureType = case when #IncludeElectronic = 'Y' then Type else [NOT like electronic] end
also
and ReviewDate = Case When #HasReviewDate = 'Y' then [ReviewDate is not null] else null end
This may help you use AND/OR instead of case
where (ReviewDate is not null or #HasReviewDate = 'Y' ) And (....)
ie when #HasReviewDate = 'Y' query will return the records with ReviewDate is not null
and when #HasReviewDate != 'Y' then query will return the records with ReviewDate is null
think of it this way:-
Your first case statement has two possible results:-
IsSigned = 'Y'
IsSigned = 'N'
Your subsequent ones have problems as they don't make sense syntactically. So the second one as written returns
SignatureType = Type
SignatureType = [NOT like electronic]
and your third:
ReviewDate = [ReviewDate is not null]
ReviewDate = null end
SO the operator has to be before the case statement and apply to all of the results of the case statement.
For example
WHERE myfield not like CASE WHEN thatfield=1 THEN 'Fish' ELSE 'Chips END
would produce either
myfield not like 'Fish'
myfield not like 'Chips'
I believe you can not use in this way, apart of that, the impact that is not like can have inside your query can be high, my recommendation changes the strategy that you are using.
So I have EXISTS in huge query which looks like this:
EXISTS(
SELECT
*
FROM
ExistTable
WHERE
ExTableFieldA = #SomeGuid AND
ExTableFieldB = MainTableFieldB AND
ExTableFieldA <> (
CASE
WHEN MainTableFieldZ = 10 THEN MainTableFieldYYY
ELSE NULL
END
)
)
The problem comes from ELSE part of CASE statement, this ExTableFieldA <> NULL will be always false. I could easily write another parameter #EmptyGuid and make it equal to '00000000-0000-0000-0000-000000000000' and everything will work but is this the best approach ?
Pretty much I want to execute another check into the exist for the small size of the records which return the "main" query.
How about removing the case and just using boolean logic?
WHERE ExTableFieldA = #SomeGuid AND
ExTableFieldB = MainTableFieldB AND
(MainTableFieldZ <> 10 OR ExTableFieldA <> MainTableFieldYYY)
I would also recommend that you qualify the column names by including the table alias.
Note: This does assume that MainTableFieldZ is not NULL. If that is a possibility than that logic can easily be incorporated.
ELSE NULL is implied even if you don't list it, but you could use ISNULL here.
ISNULL(ExTableFieldA,'') <> (
CASE
WHEN MainTableFieldZ = 10 THEN MainTableFieldYYY
ELSE ''
END
)
You may need to use some other value like 9999 instead of ''
Is it possible to use case when condition in where clause to filter select statement.
For Eg:
Select * from table_name
where source ='UHC'
and
to_char(termdate,'YYYYMM') <= '201603';
But i want second filter condition to work only if policy number is '1'. For Eg:
case when policy_number = '1' then to_char(termdate,'YYYYMM') <= '201603';
if the policy number is not 1 then only 1st where clause should work but if policy number is 1 then both the where clause should work.
i hope i made my situation clear.
You don't need case at all:
Select * from table_name
where source ='UHC'
and ((policy_number = '1' and to_char(termdate,'YYYYMM') <= '201603')
or nvl(policy_number, '0') != '1');
With case condition will be like:
where source ='UHC' and case when policy_number = '1' then to_char(termdate,'YYYYMM') else '000000' end <= '201603');
in else you need something that is always less than '201603'. Another problem here is why you're comparing numbers as varchars? Is it really what you need?
I have some negative values coming back from a query. I would like them to just be zero.
How do I write a condition in my sql query that returns zero if the value is below a certain value.
sol:
CASE WHEN CONVERT(float,dt.FQI53X02_101) < 1.3 THEN 0 ELSE CONVERT(float,dt.FQI53X02_101) END AS FQI53X02_101
You dont use If-Then-Else in the actual query (you can use them but thats something else)...
What you use is a Case statement... Try this
Select
Case When [Value] < 0 Then 0 Else [Value] End
From
Example
If you want it as part of your query, wrap the return inside a CASE statement. Example from MSDN is below
SELECT 'Price Category' =
CASE
WHEN price IS NULL THEN 'Not yet priced'
WHEN price < 10 THEN 'Very Reasonable Title'
WHEN price >= 10 and price < 20 THEN 'Coffee Table Title'
ELSE 'Expensive book!'
END,
CAST(title AS varchar(20)) AS 'Shortened Title'
FROM titles
ORDER BY price
( ABS(Value) + Value ) / 2
edit - this doesn't work now the question has changed