SQL Where clause to ensure 2 columns are not NULL at same time
On the surface, this should be a simple query but I'm not getting the results I expect.
We have 3 columns I'm interested in from a larger table - let's call them Style, City1, and City2
An example data set may look like this:
Style City1 City2
1 NULL NULL
2 Boston NULL
3 NULL Chicago
4 NULL NULL
5 New York Dallas
2 Boston NULL
2 Boston Null
I need to write a query that:
Only returns rows where Style is not Null
*SKIPS the Row if BOTH City1 and City2 are Null
That second condition is messing me up. I wrote the following but get no results:
SELECT Style
, UPPER(City1) as [City1]
, UPPER(City2) as [City2]
FROM ExampleTable
WHERE CityType in (1,2,3)
AND ((City1 is not null) and (City2 is not null))
GROUP BY Style, City1, City2
ORDER BY Style, City1, City2
This queries a subset of a larger table so there can be many rows where Style, City1 and City2 are the same. Hence the Group By to reduce it down to distinct values.
CityType is another column in table, but I'm not showing it in the results.
Here are the results I was expecting to get:
Style City1 City2
2 Boston NULL
3 NULL Chicago
5 New York Dallas
Instead, I get zero results. Any thoughts? Thanks!
We have 3 columns I'm interested in from a larger table - let's call them Style, City1, and City2
An example data set may look like this:
Style City1 City2
1 NULL NULL
2 Boston NULL
3 NULL Chicago
4 NULL NULL
5 New York Dallas
2 Boston NULL
2 Boston Null
I need to write a query that:
Only returns rows where Style is not Null
*SKIPS the Row if BOTH City1 and City2 are Null
That second condition is messing me up. I wrote the following but get no results:
SELECT Style
, UPPER(City1) as [City1]
, UPPER(City2) as [City2]
FROM ExampleTable
WHERE CityType in (1,2,3)
AND ((City1 is not null) and (City2 is not null))
GROUP BY Style, City1, City2
ORDER BY Style, City1, City2
This queries a subset of a larger table so there can be many rows where Style, City1 and City2 are the same. Hence the Group By to reduce it down to distinct values.
CityType is another column in table, but I'm not showing it in the results.
Here are the results I was expecting to get:
Style City1 City2
2 Boston NULL
3 NULL Chicago
5 New York Dallas
Instead, I get zero results. Any thoughts? Thanks!
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Give this a whirl..
SELECT Style, City1, City2
FROM your_table
WHERE Style IS NOT NULL AND NOT (City1 IS NULL AND City2 IS NULL)
Copy-paste the below code into your SSMS, execute to verify it meets your requirements, and modify to suit your names
CREATE TABLE #tmp (Style varchar(10), City1 varchar(10), City2 varchar(10))
INSERT INTO #tmp (Style, City1, City2)
VALUES
(1, NULL, NULL),
(2, 'Boston', NULL),
(3, NULL, 'Chicago'),
(4, NULL, NULL),
(5, 'New York', 'Dallas'),
(2, 'Boston', NULL),
(2, 'Boston', Null)
SELECT Style, City1, City2
FROM #tmp
WHERE Style IS NOT NULL AND NOT (City1 IS NULL AND City2 IS NULL)
GROUP BY Style, City1, City2
ORDER BY Style
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