I have a table with a column I denote with "col" containing character values. I would like to extract a column such that at the position where the column "col" starts with either '01', '02' or '03' the column will have the value "yes" and otherwise "no". I tried with the following code and can't get it to work.
SELECT
CASE WHEN col ~ '^(01|02|03)' THEN 'yes'
ELSE 'no' END
FROM table;
I know that one solution is to use the LIKE operator in the following way, but I am looking for a more compact way to solve this.
SELECT
CASE WHEN col LIKE '01%' THEN 'yes'
WHEN col LIKE '02%' THEN 'yes'
WHEN col LIKE '03%' THEN 'yes'
ELSE 'no' END
FROM table;
Any solution, even without regular expression, would be very helpful.
Thanks // Henri
Related
I have a column in table which is having single/multiple value. I have to convert it yes/no based on condition.
example:
rendition_type_sys
distribution
uploaded, distribution
uploaded
single
I need to change the value based on condition. If column having distribution then value should convert as 'Yes' otherwise 'No'
Final Output:
rendition_type_sys
Yes
Yes
No
No
I tried one case statement but that is working for single value not multiple value-
case when ren.rendition_type__sys='distribution' then 'Yes' else 'No' end as rendition_type__sys
First, you should fix your data model so you are not storing multiple values in a string.
In the meantime, like should do what you want. For your example:
(case when ren.rendition_type__sys like '%distribution%'
then 'Yes' else 'No'
end) as rendition_type__sys
Note: In case "distribution" is part of an element name and you don't want that, you can check for delimiters. In Standard SQL, this would be:
(case when ', ' || ren.rendition_type__sys || ', ' like '%, distribution, %'
then 'Yes' else 'No'
end) as rendition_type__sys
The string concatenation operator may vary depending on the database you are using.
This below code would work assuming distribution is not part of any other discrete value; here is the code in a sample form:
WITH rt AS (
SELECT 'distribution' AS rendition_type_sys
UNION SELECT 'uploaded, distribution'
UNION SELECT 'uploaded'
UNION SELECT 'single'
)
SELECT CASE WHEN rt.rendition_type_sys LIKE 'distribution' THEN 'Yes' ELSE 'No' END AS Col
FROM rt
You might consider adding a table with for these "tags" so that they are discrete.
I am trying to run this logic, where i get output as follows,
My code to get the below output field is shown below
select max(dtm) over (partition by name ,id )-current_date from mm
output
-4168
-4168
-4168
-4127
what i want is to run this logic along with 'case when' statement so i tried:
case when max(dtm) over (partition by name ,id )-current_date then 'yes'
else 'No' end as output
from mm
but i get an error as follows, not sure what went wrong in this logic.
Operator 'is true' for type 'long' not found
There are two forms of CASE expression. One is referred to as simple case expression and the other is referred to as searched case expression. The SQL in your question uses the latter, i.e. searched case expression. I believe you probably need simple case expression, i.e.
select case max(dtm) over (partition by name ,id ) - current_date
when -4168 then 'Yes'
else 'No'
end as answer
from mm
select
case when current_date-max(dtm) over (partition by name ,id ) < 30 then 'yes'
else 'No' end as 'output'
from mm
I'm creating a yes/no flag for SQL data and I have something similar to:
'''
CASE WHEN col_name IS NULL OR col_name = 0 THEN "N"
ELSE "Y"
END AS col_name_flag
'''
Is there any way to be more concise so I don't have to have the column name written out twice? Many of the column names are very long so I was wondering if there would be a way to make it more visually pleasing.
Probably the simplest method is to reverse the comparison:
(CASE WHEN col_name <> 0 THEN 'Y' ELSE 'N' END) AS col_name_flag
You could also use:
CASE IsNull(col_name,0) =0 THEN 'N' ELSE 'Y' END as col_name_flag
But I would go with Gordon's answer for performance...
tbl_LoanSummary has Sample_Number column. I have to check if Sample_Number column is not null the return 'Y' otherwise return return 'N' from below select statement.
select a.Br_Loan_No ,a.Br_LookupKey, //return IsNull(s.Sample_Number) ='N' or 'Y'
from dbo.tbl_Br a left outer join dbo.tbl_LoanSummary s
on s.Loan_no = a.Br_Loan_No order by a.Br_Loan_No
How to do this?
You can use the case expression for this...
select a.Br_Loan_No,
a.Br_LookupKey,
CASE WHEN s.Sample_Number IS NULL THEN 'N' ELSE 'Y' END AS [HasSample]
from dbo.tbl_Br a left outer join dbo.tbl_LoanSummary s
on s.Loan_no = a.Br_Loan_No order by a.Br_Loan_No
In Oracle, you could also use
select NVL(s.Sample_Number, 'N')
to return N in case of null value
(of course you still need something to have Y in case of not null.)
You'll want to use a CASE expression. It's like an embedded if-statement or switch-statement from traditional programming languages.
SELECT a.Br_Loan_No,
a.Br_LookupKey
CASE
WHEN s.Sample_Number IS NULL THEN 'N'
ELSE 'Y'
END AS sample_number_is_not_null
FROM dbo.tbl_Br a
LEFT JOIN dbo.tbl_LoanSummary s
ON s.Loan_no = a.Br_Loan_No
ORDER BY a.Br_Loan_no
Note that you are creating a computed column here, rather than selecting the raw value of an existing column. It's generally required that you give this column a name, thus the use of the AS sample_number_is_not_null.
There are two forms of the CASE expression. One lets you compare a column or value against several choices. It is like using an implicit equals:
CASE foo
WHEN 3 THEN 'foo is 3!'
WHEN 4 THEN 'foo is 4!'
ELSE 'foo is not 3 or 4'
END
The other form, in the example at the top, lets you use arbitrary expressions in each WHEN clause. It should be noted that each WHEN clause is evaluated in order and the first one to match is the one whose THEN is used as the result. If none of the WHENs match, then the result in the ELSE is used.
I was wondering if we can change the label of the select statement like we do for data in sql select using CASE
SELECT CASE column1 = 1 THEN 1 ELSE 0 END AS [Available]
But can we have a dynamic header something like
SELECT column1 AS <-- Available when 1 or Not Available when 0
This can be handled on the front end but its wise if we have it on backend. Any help or useful link is appreciated
You can do it with dynamic sql and if...else instruction but it not make sense for me. In relational database value in the cell tells you if something is available or not. If header tells you the same as cell it's duplicate information. If you want to description of the value you can use case syntax instead of 0/1 value
SELECT CASE when column1 = 1 THEN 'Available'
ELSE 'Not available'
END AS [Available]
Well, that would not make sense, as what would you expect the column name to be if you hade 2 rows, one with 1 (being available) and the other with 0(being Not Available)?
You would have to stick to something like
SELECT
CASE
WHEN column1 = 1
THEN 'Available'
ELSE 'Not available'
END as Availability
FROM YourTable