Question

I have a very simple MS SQL table with the following data(with column name and datatype):

TableId     PersonName              Attribute           AttributeValue
(int)       (nvarchar 50)           (nvarchar 50)       (bit)
----------- ----------------------- ------------------- --------------
1           A                       IsHuman             1
2           A                       CanSpeak            1
3           A                       CanSee              1
4           A                       CanWalk             0
5           B                       IsHuman             1
6           B                       CanSpeak            1
7           B                       CanSee              0
8           B                       CanWalk             0
9           C                       IsHuman             0
10          C                       CanSpeak            1
11          C                       CanSee              1
12          C                       CanWalk             0

Now, What I need as a result is the unique PersonName that have both Attribute IsHuman and CanSpeak with AttributeValue = 1.

The expected result should be (Must not include C as this one has IsHuman = 0)

PersonName
------------
A
B

Please can any expert help me in writting a SQL Query for this.

Answer 1

SELECT PersonName 
FROM MyTable 
WHERE (AttributeName = 'IsHuman' AND AttributeValue = 1) OR 
      (AttributeName = 'CanSpeak' AND AttributeValue = 1) 
GROUP BY PersonName
HAVING COUNT(*) > 1

or

SELECT PersonName 
FROM MyTable 
WHERE AttributeValue = 1 AND AttributeName IN ('IsHuman', 'CanSpeak') 
GROUP BY PersonName
HAVING COUNT(*) > 1