MYSQL Case in select statement for checking null - mysql

Question

in MySQL query if I pass:
case guides.Gud_Publish_Date
when null then "Unscheduled"
else "Forth Coming Titles"
end
then it is considering all is null even the Gud_Publish_Date has value also. the full SQL statement is
SELECT guides.Gud_Id
, guides.Gud_Image
, guides.Gud_SubEditor
, guides.Gud_Reprint_Status
, guides.Gud_Publish_Date
, guides.Gud_Img_Chk
, guides.Gud_Published
, guides.Gud_View
, (
CASE guides.Gud_Publish_Date
WHEN NULL
THEN "Unscheduled"
ELSE "Forth Coming Titles"
END
) AS Schedules
FROM guides

Answer 1

try using IF
SELECT guides.Gud_Id
, guides.Gud_Image
, guides.Gud_SubEditor
, guides.Gud_Reprint_Status
, guides.Gud_Publish_Date
, guides.Gud_Img_Chk
, guides.Gud_Published
, guides.Gud_View
, IF(guides.Gud_Publish_Date IS NULL,'Unscheduled','Forth Coming Titles')
AS Schedules
FROM guides
or if you really want CASE
SELECT guides.Gud_Id
, guides.Gud_Image
, guides.Gud_SubEditor
, guides.Gud_Reprint_Status
, guides.Gud_Publish_Date
, guides.Gud_Img_Chk
, guides.Gud_Published
, guides.Gud_View
, (
CASE
WHEN guides.Gud_Publish_Date IS NULL
THEN 'Unscheduled'
ELSE 'Forth Coming Titles'
END
) AS Schedules
FROM guides

Answer 2

I found this -a couple of months- old post. Using COALESCE option as intended by Rajan, you can do,
SELECT guides.Gud_Id
, guides.Gud_Image
, guides.Gud_SubEditor
, guides.Gud_Reprint_Status
, guides.Gud_Publish_Date
, guides.Gud_Img_Chk
, guides.Gud_Published
, guides.Gud_View
, CASE COALESCE(guides.Gud_Publish_Date, 0)
WHEN 0 THEN 'Unscheduled'
ELSE 'Forth Coming Titles'
END AS Schedules
FROM guides
The code above assumes that guides.Gud_Publish_Date cannot take the value 0, which I can do because it is a date. If that weren't the case you can change 0 for another value that it cannot take; maybe your favorite float like 3.1415 or a null identifier 'null'.

Answer 3

SELECT guides.Gud_Id
, guides.Gud_Image
, guides.Gud_SubEditor
, guides.Gud_Reprint_Status
, guides.Gud_Publish_Date
, guides.Gud_Img_Chk
, guides.Gud_Published
, guides.Gud_View
, (
CASE WHEN guides.Gud_Publish_Date IS NULL
THEN "Unscheduled"
ELSE "Forth Coming Titles"
END
) AS Schedules
FROM guides

Answer 4

Try this
SELECT guides.Gud_Id
, guides.Gud_Image
, guides.Gud_SubEditor
, guides.Gud_Reprint_Status
, guides.Gud_Publish_Date
, guides.Gud_Img_Chk
, guides.Gud_Published
, guides.Gud_View
, coalesce((
CASE guides.Gud_Publish_Date
WHEN NULL
THEN 'Unscheduled'
ELSE 'Forth Coming Titles'
END
), 'Unscheduled') AS Schedules
FROM guides