decode (case when sd='N' and sr_corp_support='0' then sr_corp_agree else null end, '1','0','0','1','') as sr_corp_agree,
hi I am having trouble understanding this code
it seems to me when some statement is 1, we get 0
&
when some statement is 0, we get 1
but I am not too sure how exactly
could you help to explain how to interpret the case when statement into is 0 or 1
thanks.
This:
decode(
case when sd='N' and sr_corp_support='0' then sr_corp_agree else null end,
'1','0',
'0','1',
''
) as sr_corp_agree
Can be rewritten as:
CASE
WHEN sd='N' AND sr_corp_support='0' AND sr_corp_agree = '1'
THEN '0'
WHEN sd='N' AND sr_corp_support='0' AND sr_corp_agree = '0'
THEN '1'
ELSE NULL -- Same as ''
END AS sr_corp_agree
In English: If the sd and sr_corp_support column values are N and 0, respectively, then if sr_corp_agree is 1 or 0 then output the opposite 0 or 1, respectively, and for any other sd, sr_corp_support or sr_corp_agree values output an empty string (which, in Oracle, is identical to NULL).
Related
SELECT
LEFT(Replace([SERIAL_NBR],'"',''),34) AS [SERIAL_NBR]
,CONVERT(datetime, Replace([INSERTED_DTM],'"',''), 103) AS [INSERTED_DTM]
,LEFT(Replace([GROUP_NAME],'"',''),1024)
,LEFT(Replace([FIRST_NAME],'"',''),50)
,LEFT(Replace([LAST_NAME],'"',''),50)
,LEFT(Replace([REASON_CODE_ID],'"',''),30)
,CASE isnumeric(Replace([VALUE],'"',''))
when 1
then CAST(Replace([VALUE],'"','') AS float)
else null
END AS [VALUE]
,LEFT(Replace([AUTOLOAD_DELIVERY_STATE_ID],'"',''),15)
,LEFT(Replace([RIDER_CLASS],'"',''), 20)
,LEFT(Replace([ADJUSTMENT_NOTES],'"',''), 1024)
FROM X
This is what I changed it to
SELECT
LEFT(Replace(SERIAL_NBR,'"',''),34) AS SERIAL_NBR
,to_timestamp(Replace(INSERTED_DTM,'"',''), 'DD/MM/YYYY') AS INSERTED_DTM
,LEFT(Replace(GROUP_NAME,'"',''),1024)
,LEFT(Replace(FIRST_NAME,'"',''),50)
,LEFT(Replace(LAST_NAME,'"',''),50)
,LEFT(Replace(REASON_CODE_ID,'"',''),30)
,CASE
WHEN is_Double(Replace(VALUE,'"','')) = 1
THEN CAST(Replace(VALUE,'"','') AS NUMBER)
ELSE NULL
END AS VALUE
,LEFT(Replace(AUTOLOAD_DELIVERY_STATE_ID,'"',''),15)
,LEFT(Replace(RIDER_CLASS,'"',''), 20)
,LEFT(Replace(ADJUSTMENT_NOTES,'"',''), 1024)
FROM stage."TL_A2_Adjustment_Note"
WHERE Replace(SERIAL_NBR,'"','') != 'A2'
It's giving me the error
001044 (42P13): SQL compilation error: error line 9 at position 9
At WHEN is_Double(Replace(VALUE,'"','')) = 1
The case statement is saying "when it can be parsed as a double/numeric do so, else use NULL"
Thus is snowflake this section:
,CASE
WHEN is_Double(Replace(VALUE,'"','')) = 1
THEN CAST(Replace(VALUE,'"','') AS NUMBER)
ELSE NULL
END AS VALUE
can use TRY_TO_DOUBLE which if it fails to parse as a float, will return null.
thus:
,TRY_TO_DOUBLE(Replace(VALUE,'"','')) as value
I am using SQL, IBM Data Studio, db2-400. I need help writing a case statement that looks for the length of a field and returns a blank if it is not equal to 14, I have tried many ways without success, below is my latest attempt.
CASE
WHEN LENGTH(TRIM(FFIUPCN) <> '14'
THEN ''
ELSE
FFIUPCN
END AS "UPC (if applicable)"
The error I get is that the token "<>" is not valid.
Main issue is that you are missing a )
CASE
WHEN LENGTH(TRIM(FFIUPCN)) <> 14
THEN ''
ELSE
FFIUPCN
END AS "UPC (if applicable)"
but you shouldn't be comparing a numeric, returned by length(), to a sring '14'. But Db2 is implicitly converting it.
For multiple conditions you can nest your case statements
Select
case when FIUPCN+FFIUPCN2 = 0
then case when FIUPCN >= value then FIUPCN + 1
else FIUPCN + 2 end
else
case when FIUPCN >= value
then case when FIUPCN <> ''
then FIUPCN + 3
else prvca1 end
else
case
when FIUPCN >= FIUPCN2 and FIUPCN3 <> 0 then FIUPCN + 4
when FIUPCN >= FIUPCNX and FIUPCNY <> 0 then FIUPCN + 5
else prvca1 end
end
end
from table
In this project I'm currently working on (I'm building a bridge between a desktop app and a new e-shop) there is a products table that has some spare columns defined that can be used for whatever reason the end user might need some custom data to be stored into.
So, the user needed to set a true/false flag to determine whether the products would appear in three different sliders... Unfortunately, the person who implemented this, didn't even use the same type of spare columns... So,
Slider1's flag is stored in a varchar(50) column
Slider2's flag is stored in a float column
Slider3's flag is stored in a float column
Additionally I ran a SELECT DISTINCT <column> for each one of them to get an idea of the actual data stored in each column and got the following results:
The varchar column has the following data stored in it:
FLDSTRING1
NULL
''
0
1
194276400456
The float column has the following data stored:
FLDFLOAT5
NULL
0
1
And the other float column has this:
FLDFLOAT6
NULL
1
Also, I ran the following query to find the different combinations of the data stored for each column:
SELECT FLDSTRING1, FLDFLOAT5, FLDFLOAT6
FROM MATERIAL
GROUP BY FLDSTRING1, FLDFLOAT5, FLDFLOAT6
and got the following combinations...
FLDSTRING1
FLDFLOAT5
FLDFLOAT6
NULL
NULL
NULL
NULL
NULL
1
NULL
0
NULL
NULL
1
NULL
NULL
1
1
''
NULL
NULL
''
NULL
1
0
NULL
NULL
0
0
NULL
1
NULL
NULL
1
NULL
1
1
0
NULL
1
1
NULL
1
1
1
194276400456
0
NULL
What I need after all this introduction...
I want a concatenated string of three comma-separated values like this
NEWPROD for when FLDSTRING1 would evaluate to true - anything not NULL, 0, or ''
CUSTOM1 for when FLDFLOAT5 would evaluate to true - basically the value 1
CUSTOM2 for when FLDFLOAT6 would evaluate to true - again value 1
After some trial and error I managed to bring this to a point that it kind of works, in the sense that it brings the correct values, not comma-separated though...
SELECT
FLDSTRING1, FLDFLOAT5, FLDFLOAT6,
CONCAT(CASE WHEN ISNULL(FLDSTRING1, '') = '' THEN '' ELSE 'NEWPROD' END,
CASE WHEN ISNULL(FLDFLOAT5, '') = '' THEN '' ELSE 'CUSTOM1' END,
CASE WHEN ISNULL(FLDFLOAT6, '') = '' THEN '' ELSE 'CUSTOM2' END) AS TAGS
FROM
MATERIAL
GROUP BY
FLDSTRING1, FLDFLOAT5, FLDFLOAT6;
FLDSTRING1
FLDFLOAT5
FLDFLOAT6
TAGS
NULL
NULL
NULL
NULL
NULL
1
CUSTOM2
NULL
0
NULL
NULL
1
NULL
CUSTOM1
NULL
1
1
CUSTOM1CUSTOM2
''
NULL
NULL
''
NULL
1
CUSTOM2
0
NULL
NULL
NEWPROD
0
0
NULL
NEWPROD
1
NULL
NULL
NEWPROD
1
NULL
1
NEWPRODCUSTOM2
1
0
NULL
NEWPROD
1
1
NULL
NEWPRODCUSTOM1
1
1
1
NEWPRODCUSTOM1CUSTOM2
194276400456
0
NULL
NEWPROD
Problem #1 is I don't quite understand how this works... I mean, value 0 isn't '', but still for the combination of NULL 0 NULL I get an empty value, which is what I wanted... But how does it do that?
And also, can someone update my final query to comma-separate the calculated TAGS column? Problem #2 is that I don't want it to contain just two commas, like ,,, when the combination wouldn't justify any of the three values to appear... It should work like PHP's implode() works...
To help you help me with this, I'm including a fiddle with the setup of the scenario I describe here... Thanks in advance!
Since you are using SQL Server 2014, instead of CONCAT_WS you may try STUFF as shown below. By prepending the delimiter , before all strings ,the STUFF will remove the first comma found.
SELECT
FLDSTRING1,
FLDFLOAT5,
FLDFLOAT6,
STUFF(
CONCAT(
CASE WHEN FLDSTRING1 IS NULL OR FLDSTRING1 IN ('0','') THEN '' THEN '' ELSE ',NEWPROD' END,
CASE WHEN FLDFLOAT5 IS NULL THEN '' ELSE ',CUSTOM1' END,
CASE WHEN FLDFLOAT6 IS NULL THEN '' ELSE ',CUSTOM2' END
),
1,1,''
) AS TAGS
FROM #MATERIAL
GROUP BY FLDSTRING1, FLDFLOAT5, FLDFLOAT6;
View working demo db fiddle
Let me know if this works for you.
Use the CONCAT_WS() function to concat values into a comma (or other separator) separated list, which ignores nulls.
To use CONCAT_WS(), you want to pass it a true NULL if the value is "blank" (by your definition), otherwise your custom label:
SELECT DISTINCT
FLDSTRING1,
FLDFLOAT5,
FLDFLOAT6,
CONCAT_WS(',',
CASE WHEN FLDSTRING1 IS NULL OR FLDSTRING1 = '' OR FLDSTRING1 = '0' THEN NULL ELSE 'NEWPROD' END,
CASE WHEN FLDFLOAT5 IS NULL OR FLDFLOAT5 = 0 THEN NULL ELSE 'CUSTOM1' END,
CASE WHEN FLDFLOAT6 IS NULL OR FLDFLOAT6 = 0 THEN NULL ELSE 'CUSTOM2' END) AS TAGS
FROM MATERIAL
Replaced GROUP BY with DISTINCT because it's simpler and (here) achieves the same thing.
If CONCAT_WS is not available:
SELECT DISTINCT
FLDSTRING1,
FLDFLOAT5,
FLDFLOAT6,
REPLACE(REPLACE(REPLACE(CONCAT(
CASE WHEN FLDSTRING1 IS NULL OR FLDSTRING1 = '' OR FLDSTRING1 = '0' THEN 'X' ELSE 'NEWPROD' END,
',',
CASE WHEN FLDFLOAT5 IS NULL OR FLDFLOAT5 = 0 THEN 'X' ELSE 'CUSTOM1' END,
',',
CASE WHEN FLDFLOAT6 IS NULL OR FLDFLOAT6 = 0 THEN 'X' ELSE 'CUSTOM2' END
), ',X', ''), 'X,', ''), 'X', '') AS TAGS
FROM MATERIAL
See dbfiddle.
I'm handing lots of data and error checking it to ensure that it follows a correct format. So I'm creating a lot of IF conditions and so far I can group lots of conditions but only output one kind of error .. or i end up writing a heck of a lot of code per condition, just to have a crystal clear error output.
Is there a way to put into the IF condition a specific error output string?
Here is my code:
-- set the initial #IntHosp_SUM value
SELECT #IntHosp_SUM = 0
-- Store the sum value to #IntHosp_SUM
SELECT #IntHosp_SUM =
(
(COALESCE (CASE WHEN #Int1_5hosp = 1 THEN COUNT (Int1_5) ELSE NULL END, 0)) +
(COALESCE (CASE WHEN #Int2_5hosp = 1 THEN COUNT (Int2_5) ELSE NULL END, 0)) +
(COALESCE (CASE WHEN #Int3_5hosp = 1 THEN COUNT (Int3_5) ELSE NULL END, 0)) +
(COALESCE (CASE WHEN #Int4_5hosp = 1 THEN COUNT (Int4_5) ELSE NULL END, 0)) +
(COALESCE (CASE WHEN #Int5_5hosp = 1 THEN COUNT (Int5_5) ELSE NULL END, 0)) +
(COALESCE (CASE WHEN #Int6_5hosp = 1 THEN COUNT (Int6_5) ELSE NULL END, 0))
)
FROM ASSSIST2_M0Teacher
-- Check RESUSE_SUM Value against Intervention Entries
SELECT #ErrorID = IsNull(Max(ErrorID) + 1, 1)
FROM ErrorTemp
WHERE (Quest = #DB + #Quest) AND (ValidateID = #ValidateID)
SELECT #Error = 0
IF (#IntHosp_SUM = 1 and #Hosp1_info is null )
or (#IntHosp_SUM = 2 and (#Hosp1_info is null or #Hosp2_info is null))
or (#IntHosp_SUM >=3 and (#Hosp1_info is null or #Hosp2_info is null or #Hosp3_info is null))
or (#IntHosp_SUM = 0 and (#Hosp1_info is not null or #Hosp2_info is not null or #Hosp3_info is not null ))
or (#IntHosp_SUM = 1 and (#Hosp2_info is not null or #Hosp3_info is not null ))
or (#IntHosp_SUM >= 2 and #Hosp3_info is not null)
BEGIN
SELECT #Error = 1
END
BEGIN
IF #Error = 1
INSERT INTO ErrorTemp
(Quest,
ValidateID,
ErrorID,
ErrorType,
ErrorDesc,
Field)
VALUES (#DB + #Quest,
#ValidateID,
#ErrorID,
'Validation',
'Too much or no info present, so incorrect',
'Hosp Info - admissions')
SELECT #ErrorID = #ErrorID + 1
END
I have declared all variables and where they are in the DB, but didn't want to clutter with extra code. You can see that I sum a series of fields if they contain the value 1 .. I don't want to add any other values, just those with '1'.
My IF conditions then check if that if there is a sum of 1, there is one entry. If 2, then two entries .. we have to be thorough and check the inverse of that, so if the sum value is 0, then no entries are made and so forth.
Is there a way to pass a string from the IF / OR condition to the error output so that I can write a unique error per condition?
SQL Server Management Studio 17.2
I have a case inside my stored procedure which I use before executing the data.
DECLARE #Setup nvarchar(50)
SELECT
#ZipCode = CASE
WHEN REPLACE(#ZipCode, '0', '') = ''
THEN NULL ELSE #ZipCode
END,
#ZipCodeEND = CASE
WHEN REPLACE(#ZipCodeEND, '0', '') = ''
THEN NULL ELSE #ZipCodeEND
END,
SELECT
#Setup = CASE WHEN (LEN(ISNULL(#ZipCode, ''))) > 0 THEN '1' ELSE '0' END +
CASE WHEN (LEN(ISNULL(#ZipCodeEND,''))) > 0 THEN '1' ELSE '0' END
IF ISNULL(#ID, 0) = 0
BEGIN
INSERT INTO dbo.MapToStaticValuesTable(ZipCode, ZipCodeEND, Setup)
VALUES(#ZipCode, #ZipCodeEND, #Setup)
END
The problem here is even if zipcode and zipcodeEnd are empty and set to null after being saved into the table I keep getting the value "11" instead of getting "00".
Now if I do the same example with nvarchar values it would work, but since ZipCode and ZipCodeEnd are set to int it's acting weird.
It is acting weird because you are using string functions on integers. Not sure what you are trying to achieve with your code but I'm sure it can be done just by checking the values as integers.
I guess this could be what you are looking for.
select case when nullif(#ZipCode, 0) is null then '0' else '1' end +
case when nullif(#ZipCodeEND, 0) is null then '0' else '1' end
One example of weird
select isNull(#ZipCode, '')
return 0 if #ZipCode is null.